SEC Info℠  
    Home      Search      My Interests      Help      Sign In      Please Sign In

Centene Corp – ‘10-K’ for 12/31/19 – ‘XML’

On:  Tuesday, 2/18/20, at 5:17pm ET   ·   For:  12/31/19   ·   Accession #:  1071739-20-60   ·   File #:  1-31826

Previous ‘10-K’:  ‘10-K’ on 2/19/19 for 12/31/18   ·   Next:  ‘10-K’ on 2/22/21 for 12/31/20   ·   Latest:  ‘10-K’ on 2/20/24 for 12/31/23   ·   12 References:   

Find Words in Filings emoji
 		  in    Show  and   ↓Hints

  As Of               Filer                 Filing    For·On·As Docs:Size

 2/18/20  Centene Corp                      10-K       12/31/19  122:16M

Annual Report   —   Form 10-K   —   Sect. 13 / 15(d) – SEA’34
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report -- form10k                            HTML   2.40M 
 2: EX-4.1      Description of Securities                           HTML     55K 
 3: EX-10.25C   Credit Agreement Amendment                          HTML     73K 
 4: EX-21       List of Subsidiaries                                HTML     67K 
 5: EX-23       Consent of Experts or Counsel                       HTML     34K 
 6: EX-31.1     Certification -- §302 - SOA'02                      HTML     40K 
 7: EX-31.2     Certification -- §302 - SOA'02                      HTML     40K 
 8: EX-32.1     Certification -- §906 - SOA'02                      HTML     35K 
 9: EX-32.2     Certification -- §906 - SOA'02                      HTML     34K 
81: R1          Cover                                               HTML     96K 
38: R2          Consolidated Balance Sheets                         HTML    133K 
50: R3          Consolidated Balance Sheets (Parenthetical)         HTML     54K 
122: R4          Consolidated Statements of Operations               HTML    119K  
82: R5          Consolidated Statements of Comprehensive Earnings   HTML     67K 
39: R6          Consolidated Statements of Stockholders' Equity     HTML    108K 
51: R7          Consolidated Statements of Stockholders' Equity     HTML     40K 
                (Parenthetical)                                                  
121: R8          Consolidated Statements of Cash Flows               HTML    139K  
83: R9          Organization and Operations                         HTML     38K 
56: R10         Summary of Significant Accounting Policies          HTML    130K 
18: R11         Acquisitions                                        HTML    106K 
88: R12         Short-term and Long-term Investments, Restricted    HTML    199K 
                Deposits                                                         
101: R13         Fair Value Measurements                             HTML    182K  
55: R14         Property, Software and Equipment                    HTML     50K 
17: R15         Goodwill and Intangible Assets                      HTML    102K 
87: R16         Medical Claims Liability                            HTML    120K 
100: R17         Affordable Care Act                                 HTML     44K  
57: R18         Debt                                                HTML    111K 
15: R19         Leases                                              HTML     60K 
80: R20         Stockholders' Equity                                HTML     44K 
118: R21         Statutory Capital Requirements and Dividend         HTML     36K  
                Restrictions                                                     
54: R22         Income Taxes                                        HTML    130K 
41: R23         Stock Incentive Plans                               HTML     51K 
79: R24         Retirement Plan                                     HTML     37K 
117: R25         Commitments                                         HTML     40K  
53: R26         Contingencies                                       HTML     59K 
40: R27         Earnings Per Share                                  HTML     57K 
77: R28         Segment Information                                 HTML     97K 
119: R29         Quarterly Selected Financial Information            HTML     81K  
97: R30         Condensed Financial Information of Registrant       HTML    180K 
84: R31         Summary of Significant Accounting Policies          HTML    171K 
                (Policies)                                                       
19: R32         Summary of Significant Accounting Policies          HTML     60K 
                (Tables)                                                         
58: R33         Acquisitions (Tables)                               HTML     86K 
98: R34         Short-term and Long-term Investments, Restricted    HTML    194K 
                Deposits (Tables)                                                
85: R35         Fair Value Measurements (Tables)                    HTML    181K 
20: R36         Property, Software and Equipment (Tables)           HTML     49K 
59: R37         Goodwill and Intangible Assets (Tables)             HTML    104K 
96: R38         Medical Claims Liability (Tables)                   HTML    116K 
86: R39         Affordable Care Act (Tables)                        HTML     43K 
115: R40         Debt (Tables)                                       HTML     83K  
74: R41         Leases (Tables)                                     HTML     59K 
30: R42         Income Taxes (Tables)                               HTML    131K 
42: R43         Stock Incentive Plans (Tables)                      HTML     45K 
116: R44         Earnings Per Share (Tables)                         HTML     57K  
75: R45         Segment Information (Tables)                        HTML     97K 
31: R46         Quarterly Selected Financial Information (Tables)   HTML     81K 
43: R47         Condensed Financial Information of Registrant       HTML    177K 
                (Tables)                                                         
114: R48         Organization and Operations (Details)               HTML     34K  
76: R49         Summary of Significant Accounting Policies -        HTML     36K 
                Restricted Deposits (Details)                                    
95: R50         Summary of Significant Accounting Policies -        HTML     56K 
                Schedule Of Property, Software And Equipment                     
                Depreciation Periods (Details)                                   
108: R51         Summary of Significant Accounting Policies -        HTML     63K  
                Schedule Of Amortization Period For Intangible                   
                Assets (Details)                                                 
61: R52         Summary of Significant Accounting Policies -        HTML     42K 
                Schedule Of Allowance For Uncollectible Accounts                 
                (Details)                                                        
23: R53         Summary of Significant Accounting Policies -        HTML     40K 
                Significant Customers (Details)                                  
94: R54         Acquisitions - Narrative (Details)                  HTML     89K 
107: R55         Acquisitions - Proforma Information (Unaudited)     HTML     52K  
                (Details)                                                        
60: R56         Acquisitions - Schedule of Preliminary Allocation   HTML     95K 
                of Fair Value of Assets Acquired and Liabilities                 
                Assumed (Details)                                                
22: R57         Short-term and Long-term Investments, Restricted    HTML     78K 
                Deposits - By Investment Type (Details)                          
93: R58         Short-term and Long-term Investments, Restricted    HTML     46K 
                Deposits - Narrative (Details)                                   
109: R59         Short-term and Long-term Investments, Restricted    HTML     69K  
                Deposits - Fair Value of Available-for-Sale                      
                Investments in a Continuous Unrealized Loss                      
                Position (Details)                                               
46: R60         Short-term and Long-term Investments, Restricted    HTML     78K 
                Deposits - Contractual Maturities of Short-Term                  
                And Long-Term Investments And Restricted Deposits                
                (Details)                                                        
36: R61         Fair Value Measurements - Fair Value Measurements   HTML    148K 
                By Level for Assets and Liabilities Measured at                  
                Fair Value on a Recurring Basis (Details)                        
70: R62         Fair Value Measurements - Narrative (Details)       HTML     34K 
112: R63         Property, Software and Equipment (Details)          HTML     59K  
45: R64         Goodwill and Intangible Assets - Schedule Of        HTML     52K 
                Changes In Goodwill By Operating Segment (Details)               
35: R65         Goodwill and Intangible Assets - Narrative          HTML     42K 
                (Details)                                                        
69: R66         Goodwill and Intangible Assets - Schedule Of        HTML     64K 
                Intangible Assets (Details)                                      
111: R67         Goodwill and Intangible Assets -Schedule Of Future  HTML     44K  
                Amortization Expenses (Details)                                  
48: R68         Medical Claims Liability - Schedule of change In    HTML     67K 
                medical claims liability (Details)                               
32: R69         Medical Claims Liability - Narrative (Details)      HTML     34K 
25: R70         Medical Claims Liability - Cumulative incurred and  HTML     51K 
                Paid Claims (Details)                                            
65: R71         Medical Claims Liability - Incurred Claims and      HTML     51K 
                Allocated Claims Adjustment Expenses (Details)                   
103: R72         Affordable Care Act (Details)                       HTML     43K  
90: R73         Debt - Schedule Of Debt (Details)                   HTML     95K 
26: R74         Debt - Senior Notes (Details)                       HTML     87K 
66: R75         Debt - Interest Rate Swaps (Details)                HTML     60K 
104: R76         Debt - Revolving Credit Facility and Term Loan      HTML     65K  
                (Details)                                                        
91: R77         Debt - Mortgage Notes Payable (Details)             HTML     41K 
29: R78         Debt - Construction Loan (Details)                  HTML     44K 
63: R79         Debt - Letters of Credit & Surety Bonds (Details)   HTML     47K 
24: R80         Debt - Schedule Of Aggregate Maturities Of Debt     HTML     56K 
                (Details)                                                        
64: R81         Leases - Narrative (Details)                        HTML     65K 
102: R82         Leases - ROU Assets and Liabilities (Details)       HTML     41K  
89: R83         Leases - Operating Lease Maturity (Details)         HTML     51K 
27: R84         Leases - Future Minimum Lease Payments Under Topic  HTML     53K 
                840 (Details)                                                    
67: R85         Stockholders' Equity (Details)                      HTML     99K 
105: R86         Statutory Capital Requirements and Dividend         HTML     38K  
                Restrictions (Details)                                           
92: R87         Income Taxes - Consolidated Income Tax Expense      HTML     49K 
                (Details)                                                        
28: R88         Income Taxes - Reconciliation Of The Tax Provision  HTML     67K 
                At The U.S. Federal Statutory Rate To The                        
                Provision For Income Taxes (Details)                             
62: R89         Income Taxes - Tax Effects Of Temporary             HTML     85K 
                Differences Which Give Rise To Deferred Tax Assets               
                And Liabilities (Details)                                        
47: R90         Income Taxes - Narrative (Details)                  HTML     52K 
37: R91         Income Taxes - Schedule of Reserve for Uncertain    HTML     52K 
                Tax Positions That May BE Challenged (Details)                   
72: R92         Stock Incentive Plans - Narrative (Details)         HTML     67K 
113: R93         Stock Incentive Plans - Non-Vested Restricted       HTML     57K  
                Stock And Restricted Stock (Details)                             
44: R94         Retirement Plan (Details)                           HTML     36K 
34: R95         Commitments (Details)                               HTML     61K 
68: R96         Earnings Per Share (Details)                        HTML     68K 
110: R97         Segment Information (Details)                       HTML     62K  
49: R98         Quarterly Selected Financial Information (Details)  HTML     57K 
33: R99         Condensed Financial Information of Registrant -     HTML    120K 
                Condensed Balance Sheets (Details)                               
78: R100        Condensed Financial Information of Registrant -     HTML     57K 
                Condensed Balance Sheets Additional (Details)                    
120: R101        Condensed Financial Information of Registrant -     HTML    106K  
                Condensed Statements Of Operations (Details)                     
52: R102        Condensed Financial Information of Registrant -     HTML    107K 
                Condensed Statements Of Cash Flows (Details)                     
71: R9999       Uncategorized Items - form10k.htm                   HTML     33K 
99: XML         IDEA XML File -- Filing Summary                      XML    222K 
73: XML         XBRL Instance -- form10k_htm                         XML   4.24M 
106: EXCEL       IDEA Workbook of Financial Reports                  XLSX    146K  
11: EX-101.CAL  XBRL Calculations -- cnc-20191231_cal                XML    405K 
12: EX-101.DEF  XBRL Definitions -- cnc-20191231_def                 XML   1.00M 
13: EX-101.LAB  XBRL Labels -- cnc-20191231_lab                      XML   2.36M 
14: EX-101.PRE  XBRL Presentations -- cnc-20191231_pre               XML   1.54M 
10: EX-101.SCH  XBRL Schema -- cnc-20191231                          XSD    237K 
21: JSON        XBRL Instance as JSON Data -- MetaLinks              516±   792K 
16: ZIP         XBRL Zipped Folder -- 0001071739-20-000060-xbrl      Zip    576K

‘XML’   —   IDEA XML File — Filing Summary

This Document is an IDEA XML File.

                                                                                                                                                                                
<?xml version="1.0" encoding="windows-1252"?>
<FilingSummary>
<Version> 3.19.3.a.u2 </Version>
<ProcessingTime/>
<ReportFormat> html </ReportFormat>
<ContextCount> 420 </ContextCount>
<ElementCount> 556 </ElementCount>
<EntityCount> 1 </EntityCount>
<FootnotesReported> false </FootnotesReported>
<SegmentCount> 111 </SegmentCount>
<ScenarioCount> 0 </ScenarioCount>
<TuplesReported> false </TuplesReported>
<UnitCount> 10 </UnitCount>
<MyReports>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R1.htm </HtmlFileName>
<LongName> 0001000 - Document - Cover </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/Cover </Role>
<ShortName> Cover </ShortName>
<MenuCategory> Cover </MenuCategory>
<Position> 1 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R2.htm </HtmlFileName>
<LongName> 1001000 - Statement - CONSOLIDATED BALANCE SHEETS </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/ConsolidatedBalanceSheets </Role>
<ShortName> CONSOLIDATED BALANCE SHEETS </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 2 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R3.htm </HtmlFileName>
<LongName> 1001501 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/ConsolidatedBalanceSheetsParenthetical </Role>
<ShortName> CONSOLIDATED BALANCE SHEETS (Parenthetical) </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 3 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R4.htm </HtmlFileName>
<LongName> 1002000 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/ConsolidatedStatementsOfOperations </Role>
<ShortName> CONSOLIDATED STATEMENTS OF OPERATIONS </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 4 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R5.htm </HtmlFileName>
<LongName> 1003000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/ConsolidatedStatementsOfComprehensiveEarnings </Role>
<ShortName> CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 5 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R6.htm </HtmlFileName>
<LongName> 1004000 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/ConsolidatedStatementsOfStockholdersEquity </Role>
<ShortName> CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 6 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R7.htm </HtmlFileName>
<LongName> 1004501 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/ConsolidatedStatementsOfStockholdersEquityParenthetical </Role>
<ShortName> CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 7 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R8.htm </HtmlFileName>
<LongName> 1005000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/ConsolidatedStatementsOfCashFlows </Role>
<ShortName> CONSOLIDATED STATEMENTS OF CASH FLOWS </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 8 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R9.htm </HtmlFileName>
<LongName> 2101100 - Disclosure - Organization and Operations </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/OrganizationAndOperations </Role>
<ShortName> Organization and Operations </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 9 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R10.htm </HtmlFileName>
<LongName> 2102100 - Disclosure - Summary of Significant Accounting Policies </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/SummaryOfSignificantAccountingPolicies </Role>
<ShortName> Summary of Significant Accounting Policies </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 10 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R11.htm </HtmlFileName>
<LongName> 2103100 - Disclosure - Acquisitions </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/Acquisitions </Role>
<ShortName> Acquisitions </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 11 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R12.htm </HtmlFileName>
<LongName> 2104100 - Disclosure - Short-term and Long-term Investments, Restricted Deposits </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/ShortTermAndLongTermInvestmentsRestrictedDeposits </Role>
<ShortName> Short-term and Long-term Investments, Restricted Deposits </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 12 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R13.htm </HtmlFileName>
<LongName> 2105100 - Disclosure - Fair Value Measurements </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/FairValueMeasurements </Role>
<ShortName> Fair Value Measurements </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 13 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R14.htm </HtmlFileName>
<LongName> 2106100 - Disclosure - Property, Software and Equipment </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/PropertySoftwareAndEquipment </Role>
<ShortName> Property, Software and Equipment </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 14 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R15.htm </HtmlFileName>
<LongName> 2107100 - Disclosure - Goodwill and Intangible Assets </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/GoodwillAndIntangibleAssets </Role>
<ShortName> Goodwill and Intangible Assets </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 15 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R16.htm </HtmlFileName>
<LongName> 2108100 - Disclosure - Medical Claims Liability </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/MedicalClaimsLiability </Role>
<ShortName> Medical Claims Liability </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 16 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R17.htm </HtmlFileName>
<LongName> 2109100 - Disclosure - Affordable Care Act </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/AffordableCareAct </Role>
<ShortName> Affordable Care Act </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 17 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R18.htm </HtmlFileName>
<LongName> 2110100 - Disclosure - Debt </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/Debt </Role>
<ShortName> Debt </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 18 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R19.htm </HtmlFileName>
<LongName> 2111100 - Disclosure - Leases </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/Leases </Role>
<ShortName> Leases </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 19 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R20.htm </HtmlFileName>
<LongName> 2112100 - Disclosure - Stockholders' Equity </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/StockholdersEquity </Role>
<ShortName> Stockholders' Equity </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 20 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R21.htm </HtmlFileName>
<LongName> 2113100 - Disclosure - Statutory Capital Requirements and Dividend Restrictions </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/StatutoryCapitalRequirementsAndDividendRestrictions </Role>
<ShortName> Statutory Capital Requirements and Dividend Restrictions </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 21 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R22.htm </HtmlFileName>
<LongName> 2114100 - Disclosure - Income Taxes </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/IncomeTaxes </Role>
<ShortName> Income Taxes </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 22 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R23.htm </HtmlFileName>
<LongName> 2115100 - Disclosure - Stock Incentive Plans </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/StockIncentivePlans </Role>
<ShortName> Stock Incentive Plans </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 23 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R24.htm </HtmlFileName>
<LongName> 2116100 - Disclosure - Retirement Plan </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/RetirementPlan </Role>
<ShortName> Retirement Plan </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 24 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R25.htm </HtmlFileName>
<LongName> 2117100 - Disclosure - Commitments </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/Commitments </Role>
<ShortName> Commitments </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 25 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R26.htm </HtmlFileName>
<LongName> 2118100 - Disclosure - Contingencies </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/Contingencies </Role>
<ShortName> Contingencies </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 26 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R27.htm </HtmlFileName>
<LongName> 2119100 - Disclosure - Earnings Per Share </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/EarningsPerShare </Role>
<ShortName> Earnings Per Share </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 27 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R28.htm </HtmlFileName>
<LongName> 2120100 - Disclosure - Segment Information </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/SegmentInformation </Role>
<ShortName> Segment Information </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 28 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R29.htm </HtmlFileName>
<LongName> 2121100 - Disclosure - Quarterly Selected Financial Information </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/QuarterlySelectedFinancialInformation </Role>
<ShortName> Quarterly Selected Financial Information </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 29 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R30.htm </HtmlFileName>
<LongName> 2122100 - Disclosure - Condensed Financial Information of Registrant </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/CondensedFinancialInformationOfRegistrant </Role>
<ShortName> Condensed Financial Information of Registrant </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 30 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R31.htm </HtmlFileName>
<LongName> 2202201 - Disclosure - Summary of Significant Accounting Policies (Policies) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/SummaryOfSignificantAccountingPoliciesPolicies </Role>
<ShortName> Summary of Significant Accounting Policies (Policies) </ShortName>
<MenuCategory> Policies </MenuCategory>
<ParentRole> http://www.centene.com/role/SummaryOfSignificantAccountingPolicies </ParentRole>
<Position> 31 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R32.htm </HtmlFileName>
<LongName> 2302302 - Disclosure - Summary of Significant Accounting Policies (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/SummaryOfSignificantAccountingPoliciesTables </Role>
<ShortName> Summary of Significant Accounting Policies (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.centene.com/role/SummaryOfSignificantAccountingPolicies </ParentRole>
<Position> 32 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R33.htm </HtmlFileName>
<LongName> 2303301 - Disclosure - Acquisitions (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/AcquisitionsTables </Role>
<ShortName> Acquisitions (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.centene.com/role/Acquisitions </ParentRole>
<Position> 33 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R34.htm </HtmlFileName>
<LongName> 2304301 - Disclosure - Short-term and Long-term Investments, Restricted Deposits (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/ShortTermAndLongTermInvestmentsRestrictedDepositsTables </Role>
<ShortName> Short-term and Long-term Investments, Restricted Deposits (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.centene.com/role/ShortTermAndLongTermInvestmentsRestrictedDeposits </ParentRole>
<Position> 34 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R35.htm </HtmlFileName>
<LongName> 2305301 - Disclosure - Fair Value Measurements (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/FairValueMeasurementsTables </Role>
<ShortName> Fair Value Measurements (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.centene.com/role/FairValueMeasurements </ParentRole>
<Position> 35 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R36.htm </HtmlFileName>
<LongName> 2306301 - Disclosure - Property, Software and Equipment (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/PropertySoftwareAndEquipmentTables </Role>
<ShortName> Property, Software and Equipment (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.centene.com/role/PropertySoftwareAndEquipment </ParentRole>
<Position> 36 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R37.htm </HtmlFileName>
<LongName> 2307301 - Disclosure - Goodwill and Intangible Assets (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/GoodwillAndIntangibleAssetsTables </Role>
<ShortName> Goodwill and Intangible Assets (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.centene.com/role/GoodwillAndIntangibleAssets </ParentRole>
<Position> 37 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R38.htm </HtmlFileName>
<LongName> 2308301 - Disclosure - Medical Claims Liability (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/MedicalClaimsLiabilityTables </Role>
<ShortName> Medical Claims Liability (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.centene.com/role/MedicalClaimsLiability </ParentRole>
<Position> 38 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R39.htm </HtmlFileName>
<LongName> 2309301 - Disclosure - Affordable Care Act (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/AffordableCareActTables </Role>
<ShortName> Affordable Care Act (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.centene.com/role/AffordableCareAct </ParentRole>
<Position> 39 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R40.htm </HtmlFileName>
<LongName> 2310301 - Disclosure - Debt (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/DebtTables </Role>
<ShortName> Debt (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.centene.com/role/Debt </ParentRole>
<Position> 40 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R41.htm </HtmlFileName>
<LongName> 2311301 - Disclosure - Leases (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/LeasesTables </Role>
<ShortName> Leases (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.centene.com/role/Leases </ParentRole>
<Position> 41 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R42.htm </HtmlFileName>
<LongName> 2314301 - Disclosure - Income Taxes (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/IncomeTaxesTables </Role>
<ShortName> Income Taxes (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.centene.com/role/IncomeTaxes </ParentRole>
<Position> 42 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R43.htm </HtmlFileName>
<LongName> 2315301 - Disclosure - Stock Incentive Plans (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/StockIncentivePlansTables </Role>
<ShortName> Stock Incentive Plans (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.centene.com/role/StockIncentivePlans </ParentRole>
<Position> 43 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R44.htm </HtmlFileName>
<LongName> 2319301 - Disclosure - Earnings Per Share (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/EarningsPerShareTables </Role>
<ShortName> Earnings Per Share (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.centene.com/role/EarningsPerShare </ParentRole>
<Position> 44 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R45.htm </HtmlFileName>
<LongName> 2320301 - Disclosure - Segment Information (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/SegmentInformationTables </Role>
<ShortName> Segment Information (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.centene.com/role/SegmentInformation </ParentRole>
<Position> 45 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R46.htm </HtmlFileName>
<LongName> 2321301 - Disclosure - Quarterly Selected Financial Information (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/QuarterlySelectedFinancialInformationTables </Role>
<ShortName> Quarterly Selected Financial Information (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.centene.com/role/QuarterlySelectedFinancialInformation </ParentRole>
<Position> 46 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R47.htm </HtmlFileName>
<LongName> 2322301 - Disclosure - Condensed Financial Information of Registrant (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/CondensedFinancialInformationOfRegistrantTables </Role>
<ShortName> Condensed Financial Information of Registrant (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.centene.com/role/CondensedFinancialInformationOfRegistrant </ParentRole>
<Position> 47 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R48.htm </HtmlFileName>
<LongName> 2401401 - Disclosure - Organization and Operations (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/OrganizationAndOperationsDetails </Role>
<ShortName> Organization and Operations (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.centene.com/role/OrganizationAndOperations </ParentRole>
<Position> 48 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R49.htm </HtmlFileName>
<LongName> 2402403 - Disclosure - Summary of Significant Accounting Policies - Restricted Deposits (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/SummaryOfSignificantAccountingPoliciesRestrictedDepositsDetails </Role>
<ShortName> Summary of Significant Accounting Policies - Restricted Deposits (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 49 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R50.htm </HtmlFileName>
<LongName> 2402404 - Disclosure - Summary of Significant Accounting Policies - Schedule Of Property, Software And Equipment Depreciation Periods (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/SummaryOfSignificantAccountingPoliciesScheduleOfPropertySoftwareAndEquipmentDepreciationPeriodsDetails </Role>
<ShortName> Summary of Significant Accounting Policies - Schedule Of Property, Software And Equipment Depreciation Periods (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 50 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R51.htm </HtmlFileName>
<LongName> 2402405 - Disclosure - Summary of Significant Accounting Policies - Schedule Of Amortization Period For Intangible Assets (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/SummaryOfSignificantAccountingPoliciesScheduleOfAmortizationPeriodForIntangibleAssetsDetails </Role>
<ShortName> Summary of Significant Accounting Policies - Schedule Of Amortization Period For Intangible Assets (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 51 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R52.htm </HtmlFileName>
<LongName> 2402406 - Disclosure - Summary of Significant Accounting Policies - Schedule Of Allowance For Uncollectible Accounts (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/SummaryOfSignificantAccountingPoliciesScheduleOfAllowanceForUncollectibleAccountsDetails </Role>
<ShortName> Summary of Significant Accounting Policies - Schedule Of Allowance For Uncollectible Accounts (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 52 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R53.htm </HtmlFileName>
<LongName> 2402407 - Disclosure - Summary of Significant Accounting Policies - Significant Customers (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/SummaryOfSignificantAccountingPoliciesSignificantCustomersDetails </Role>
<ShortName> Summary of Significant Accounting Policies - Significant Customers (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 53 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R54.htm </HtmlFileName>
<LongName> 2403402 - Disclosure - Acquisitions - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/AcquisitionsNarrativeDetails </Role>
<ShortName> Acquisitions - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 54 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R55.htm </HtmlFileName>
<LongName> 2403403 - Disclosure - Acquisitions - Proforma Information (unaudited) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/AcquisitionsProformaInformationUnauditedDetails </Role>
<ShortName> Acquisitions - Proforma Information (unaudited) (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 55 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R56.htm </HtmlFileName>
<LongName> 2403404 - Disclosure - Acquisitions - Schedule of Preliminary Allocation of Fair Value of Assets Acquired and Liabilities Assumed (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/AcquisitionsScheduleOfPreliminaryAllocationOfFairValueOfAssetsAcquiredAndLiabilitiesAssumedDetails </Role>
<ShortName> Acquisitions - Schedule of Preliminary Allocation of Fair Value of Assets Acquired and Liabilities Assumed (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 56 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R57.htm </HtmlFileName>
<LongName> 2404402 - Disclosure - Short-term and Long-term Investments, Restricted Deposits - By Investment Type (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/ShortTermAndLongTermInvestmentsRestrictedDepositsByInvestmentTypeDetails </Role>
<ShortName> Short-term and Long-term Investments, Restricted Deposits - By Investment Type (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 57 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R58.htm </HtmlFileName>
<LongName> 2404403 - Disclosure - Short-term and Long-term Investments, Restricted Deposits - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/ShortTermAndLongTermInvestmentsRestrictedDepositsNarrativeDetails </Role>
<ShortName> Short-term and Long-term Investments, Restricted Deposits - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.centene.com/role/ShortTermAndLongTermInvestmentsRestrictedDepositsTables </ParentRole>
<Position> 58 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R59.htm </HtmlFileName>
<LongName> 2404404 - Disclosure - Short-term and Long-term Investments, Restricted Deposits - Fair Value of Available-for-Sale Investments in a Continuous Unrealized Loss Position (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/ShortTermAndLongTermInvestmentsRestrictedDepositsFairValueOfAvailableForSaleInvestmentsInContinuousUnrealizedLossPositionDetails </Role>
<ShortName> Short-term and Long-term Investments, Restricted Deposits - Fair Value of Available-for-Sale Investments in a Continuous Unrealized Loss Position (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 59 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R60.htm </HtmlFileName>
<LongName> 2404405 - Disclosure - Short-term and Long-term Investments, Restricted Deposits - Contractual Maturities of Short-Term And Long-Term Investments And Restricted Deposits (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/ShortTermAndLongTermInvestmentsRestrictedDepositsContractualMaturitiesOfShortTermAndLongTermInvestmentsAndRestrictedDepositsDetails </Role>
<ShortName> Short-term and Long-term Investments, Restricted Deposits - Contractual Maturities of Short-Term And Long-Term Investments And Restricted Deposits (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 60 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R61.htm </HtmlFileName>
<LongName> 2405402 - Disclosure - Fair Value Measurements - Fair Value Measurements By Level for Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/FairValueMeasurementsFairValueMeasurementsByLevelForAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails </Role>
<ShortName> Fair Value Measurements - Fair Value Measurements By Level for Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 61 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R62.htm </HtmlFileName>
<LongName> 2405403 - Disclosure - Fair Value Measurements - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/FairValueMeasurementsNarrativeDetails </Role>
<ShortName> Fair Value Measurements - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 62 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R63.htm </HtmlFileName>
<LongName> 2406402 - Disclosure - Property, Software and Equipment (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/PropertySoftwareAndEquipmentDetails </Role>
<ShortName> Property, Software and Equipment (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.centene.com/role/PropertySoftwareAndEquipmentTables </ParentRole>
<Position> 63 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R64.htm </HtmlFileName>
<LongName> 2407402 - Disclosure - Goodwill and Intangible Assets - Schedule Of Changes In Goodwill By Operating Segment (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/GoodwillAndIntangibleAssetsScheduleOfChangesInGoodwillByOperatingSegmentDetails </Role>
<ShortName> Goodwill and Intangible Assets - Schedule Of Changes In Goodwill By Operating Segment (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 64 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R65.htm </HtmlFileName>
<LongName> 2407403 - Disclosure - Goodwill and Intangible Assets - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/GoodwillAndIntangibleAssetsNarrativeDetails </Role>
<ShortName> Goodwill and Intangible Assets - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 65 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R66.htm </HtmlFileName>
<LongName> 2407404 - Disclosure - Goodwill and Intangible Assets - Schedule Of Intangible Assets (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/GoodwillAndIntangibleAssetsScheduleOfIntangibleAssetsDetails </Role>
<ShortName> Goodwill and Intangible Assets - Schedule Of Intangible Assets (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 66 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R67.htm </HtmlFileName>
<LongName> 2407405 - Disclosure - Goodwill and Intangible Assets -Schedule Of Future Amortization Expenses (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/GoodwillAndIntangibleAssetsScheduleOfFutureAmortizationExpensesDetails </Role>
<ShortName> Goodwill and Intangible Assets -Schedule Of Future Amortization Expenses (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 67 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R68.htm </HtmlFileName>
<LongName> 2408402 - Disclosure - Medical Claims Liability - Schedule of change In medical claims liability (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/MedicalClaimsLiabilityScheduleOfChangeInMedicalClaimsLiabilityDetails </Role>
<ShortName> Medical Claims Liability - Schedule of change In medical claims liability (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 68 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R69.htm </HtmlFileName>
<LongName> 2408403 - Disclosure - Medical Claims Liability - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/MedicalClaimsLiabilityNarrativeDetails </Role>
<ShortName> Medical Claims Liability - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 69 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R70.htm </HtmlFileName>
<LongName> 2408404 - Disclosure - Medical Claims Liability - Cumulative incurred and Paid Claims (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/MedicalClaimsLiabilityCumulativeIncurredAndPaidClaimsDetails </Role>
<ShortName> Medical Claims Liability - Cumulative incurred and Paid Claims (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 70 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R71.htm </HtmlFileName>
<LongName> 2408405 - Disclosure - Medical Claims Liability - Incurred Claims and Allocated Claims Adjustment Expenses (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/MedicalClaimsLiabilityIncurredClaimsAndAllocatedClaimsAdjustmentExpensesDetails </Role>
<ShortName> Medical Claims Liability - Incurred Claims and Allocated Claims Adjustment Expenses (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 71 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R72.htm </HtmlFileName>
<LongName> 2409402 - Disclosure - Affordable Care Act (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/AffordableCareActDetails </Role>
<ShortName> Affordable Care Act (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.centene.com/role/AffordableCareActTables </ParentRole>
<Position> 72 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R73.htm </HtmlFileName>
<LongName> 2410402 - Disclosure - Debt - Schedule Of Debt (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/DebtScheduleOfDebtDetails </Role>
<ShortName> Debt - Schedule Of Debt (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 73 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R74.htm </HtmlFileName>
<LongName> 2410403 - Disclosure - Debt - Senior Notes (Details) </LongName>
<ReportType> Notes </ReportType>
<Role> http://www.centene.com/role/DebtSeniorNotesDetails </Role>
<ShortName> Debt - Senior Notes (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 74 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R75.htm </HtmlFileName>
<LongName> 2410404 - Disclosure - Debt - Interest Rate Swaps (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/DebtInterestRateSwapsDetails </Role>
<ShortName> Debt - Interest Rate Swaps (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 75 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R76.htm </HtmlFileName>
<LongName> 2410405 - Disclosure - Debt - Revolving Credit Facility and Term Loan (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/DebtRevolvingCreditFacilityAndTermLoanDetails </Role>
<ShortName> Debt - Revolving Credit Facility and Term Loan (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 76 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R77.htm </HtmlFileName>
<LongName> 2410406 - Disclosure - Debt - Mortgage Notes Payable (Details) </LongName>
<ReportType> Notes </ReportType>
<Role> http://www.centene.com/role/DebtMortgageNotesPayableDetails </Role>
<ShortName> Debt - Mortgage Notes Payable (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 77 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R78.htm </HtmlFileName>
<LongName> 2410407 - Disclosure - Debt - Construction Loan (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/DebtConstructionLoanDetails </Role>
<ShortName> Debt - Construction Loan (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 78 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R79.htm </HtmlFileName>
<LongName> 2410408 - Disclosure - Debt - Letters of Credit & Surety Bonds (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/DebtLettersOfCreditSuretyBondsDetails </Role>
<ShortName> Debt - Letters of Credit & Surety Bonds (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 79 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R80.htm </HtmlFileName>
<LongName> 2410409 - Disclosure - Debt - Schedule Of Aggregate Maturities Of Debt (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/DebtScheduleOfAggregateMaturitiesOfDebtDetails </Role>
<ShortName> Debt - Schedule Of Aggregate Maturities Of Debt (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 80 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R81.htm </HtmlFileName>
<LongName> 2411402 - Disclosure - Leases - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/LeasesNarrativeDetails </Role>
<ShortName> Leases - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 81 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R82.htm </HtmlFileName>
<LongName> 2411403 - Disclosure - Leases - ROU Assets and Liabilities (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/LeasesRouAssetsAndLiabilitiesDetails </Role>
<ShortName> Leases - ROU Assets and Liabilities (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 82 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R83.htm </HtmlFileName>
<LongName> 2411404 - Disclosure - Leases - Operating Lease Maturity (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/LeasesOperatingLeaseMaturityDetails </Role>
<ShortName> Leases - Operating Lease Maturity (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 83 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R84.htm </HtmlFileName>
<LongName> 2411405 - Disclosure - Leases - Future Minimum Lease Payments Under Topic 840 (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/LeasesFutureMinimumLeasePaymentsUnderTopic840Details </Role>
<ShortName> Leases - Future Minimum Lease Payments Under Topic 840 (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 84 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R85.htm </HtmlFileName>
<LongName> 2412401 - Disclosure - Stockholders' Equity (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/StockholdersEquityDetails </Role>
<ShortName> Stockholders' Equity (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.centene.com/role/StockholdersEquity </ParentRole>
<Position> 85 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R86.htm </HtmlFileName>
<LongName> 2413401 - Disclosure - Statutory Capital Requirements and Dividend Restrictions (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/StatutoryCapitalRequirementsAndDividendRestrictionsDetails </Role>
<ShortName> Statutory Capital Requirements and Dividend Restrictions (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.centene.com/role/StatutoryCapitalRequirementsAndDividendRestrictions </ParentRole>
<Position> 86 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R87.htm </HtmlFileName>
<LongName> 2414402 - Disclosure - Income Taxes - Consolidated Income Tax Expense (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/IncomeTaxesConsolidatedIncomeTaxExpenseDetails </Role>
<ShortName> Income Taxes - Consolidated Income Tax Expense (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 87 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R88.htm </HtmlFileName>
<LongName> 2414403 - Disclosure - Income Taxes - Reconciliation Of The Tax Provision At The U.S. Federal Statutory Rate To The Provision For Income Taxes (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/IncomeTaxesReconciliationOfTaxProvisionAtUSFederalStatutoryRateToProvisionForIncomeTaxesDetails </Role>
<ShortName> Income Taxes - Reconciliation Of The Tax Provision At The U.S. Federal Statutory Rate To The Provision For Income Taxes (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 88 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R89.htm </HtmlFileName>
<LongName> 2414404 - Disclosure - Income Taxes - Tax Effects Of Temporary Differences Which Give Rise To Deferred Tax Assets And Liabilities (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/IncomeTaxesTaxEffectsOfTemporaryDifferencesWhichGiveRiseToDeferredTaxAssetsAndLiabilitiesDetails </Role>
<ShortName> Income Taxes - Tax Effects Of Temporary Differences Which Give Rise To Deferred Tax Assets And Liabilities (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 89 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R90.htm </HtmlFileName>
<LongName> 2414405 - Disclosure - Income Taxes - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/IncomeTaxesNarrativeDetails </Role>
<ShortName> Income Taxes - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 90 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R91.htm </HtmlFileName>
<LongName> 2414406 - Disclosure - Income Taxes - Schedule of Reserve for Uncertain Tax Positions That May BE Challenged (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/IncomeTaxesScheduleOfReserveForUncertainTaxPositionsThatMayBeChallengedDetails </Role>
<ShortName> Income Taxes - Schedule of Reserve for Uncertain Tax Positions That May BE Challenged (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 91 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R92.htm </HtmlFileName>
<LongName> 2415402 - Disclosure - Stock Incentive Plans - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/StockIncentivePlansNarrativeDetails </Role>
<ShortName> Stock Incentive Plans - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 92 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R93.htm </HtmlFileName>
<LongName> 2415403 - Disclosure - Stock Incentive Plans - Non-Vested Restricted Stock And Restricted Stock (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/StockIncentivePlansNonVestedRestrictedStockAndRestrictedStockDetails </Role>
<ShortName> Stock Incentive Plans - Non-Vested Restricted Stock And Restricted Stock (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 93 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R94.htm </HtmlFileName>
<LongName> 2416401 - Disclosure - Retirement Plan (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/RetirementPlanDetails </Role>
<ShortName> Retirement Plan (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.centene.com/role/RetirementPlan </ParentRole>
<Position> 94 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R95.htm </HtmlFileName>
<LongName> 2417401 - Disclosure - Commitments (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/CommitmentsDetails </Role>
<ShortName> Commitments (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.centene.com/role/Commitments </ParentRole>
<Position> 95 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R96.htm </HtmlFileName>
<LongName> 2419402 - Disclosure - Earnings Per Share (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/EarningsPerShareDetails </Role>
<ShortName> Earnings Per Share (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.centene.com/role/EarningsPerShareTables </ParentRole>
<Position> 96 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R97.htm </HtmlFileName>
<LongName> 2420402 - Disclosure - Segment Information (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/SegmentInformationDetails </Role>
<ShortName> Segment Information (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.centene.com/role/SegmentInformationTables </ParentRole>
<Position> 97 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R98.htm </HtmlFileName>
<LongName> 2421402 - Disclosure - Quarterly Selected Financial Information (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/QuarterlySelectedFinancialInformationDetails </Role>
<ShortName> Quarterly Selected Financial Information (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.centene.com/role/QuarterlySelectedFinancialInformationTables </ParentRole>
<Position> 98 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R99.htm </HtmlFileName>
<LongName> 2422402 - Disclosure - Condensed Financial Information of Registrant - Condensed Balance Sheets (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/CondensedFinancialInformationOfRegistrantCondensedBalanceSheetsDetails </Role>
<ShortName> Condensed Financial Information of Registrant - Condensed Balance Sheets (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 99 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R100.htm </HtmlFileName>
<LongName> 2422403 - Disclosure - Condensed Financial Information of Registrant - Condensed Balance Sheets Additional (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/CondensedFinancialInformationOfRegistrantCondensedBalanceSheetsAdditionalDetails </Role>
<ShortName> Condensed Financial Information of Registrant - Condensed Balance Sheets Additional (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 100 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R101.htm </HtmlFileName>
<LongName> 2422404 - Disclosure - Condensed Financial Information of Registrant - Condensed Statements Of Operations (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/CondensedFinancialInformationOfRegistrantCondensedStatementsOfOperationsDetails </Role>
<ShortName> Condensed Financial Information of Registrant - Condensed Statements Of Operations (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 101 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R102.htm </HtmlFileName>
<LongName> 2422405 - Disclosure - Condensed Financial Information of Registrant - Condensed Statements Of Cash Flows (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.centene.com/role/CondensedFinancialInformationOfRegistrantCondensedStatementsOfCashFlowsDetails </Role>
<ShortName> Condensed Financial Information of Registrant - Condensed Statements Of Cash Flows (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 102 </Position>
</Report>
<Report instance="form10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R9999.htm </HtmlFileName>
<LongName> Uncategorized Items - form10k.htm </LongName>
<ReportType> Sheet </ReportType>
<Role> http://xbrl.sec.gov/role/uncategorizedFacts </Role>
<ShortName> Uncategorized Items - form10k.htm </ShortName>
<MenuCategory> Cover </MenuCategory>
<Position> 103 </Position>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<LongName> All Reports </LongName>
<ReportType> Book </ReportType>
<ShortName> All Reports </ShortName>
</Report>
</MyReports>
<InputFiles>
<File doctype="10-K" original="form10k.htm"> form10k.htm </File>
<File> cnc-20191231.xsd </File>
<File> cnc-20191231_cal.xml </File>
<File> cnc-20191231_def.xml </File>
<File> cnc-20191231_lab.xml </File>
<File> cnc-20191231_pre.xml </File>
<File> exhibit1025c2019123110-k.htm </File>
<File> exhibit21q42019.htm </File>
<File> exhibit23q42019.htm </File>
<File> exhibit3112019123110-k.htm </File>
<File> exhibit3122019123110-k.htm </File>
<File> exhibit3212019123110-k.htm </File>
<File> exhibit3222019123110-k.htm </File>
<File> exhibit412019123110-k.htm </File>
</InputFiles>
<SupplementalFiles>
<File> chart-e0356faa03cf5101a35.jpg </File>
</SupplementalFiles>
<BaseTaxonomies>
<BaseTaxonomy> http://xbrl.sec.gov/dei/2019-01-31 </BaseTaxonomy>
<BaseTaxonomy> http://xbrl.sec.gov/stpr/2018-01-31 </BaseTaxonomy>
<BaseTaxonomy> http://fasb.org/us-gaap/2019-01-31 </BaseTaxonomy>
<BaseTaxonomy> http://fasb.org/srt/2019-01-31 </BaseTaxonomy>
</BaseTaxonomies>
<HasPresentationLinkbase> true </HasPresentationLinkbase>
<HasCalculationLinkbase> true </HasCalculationLinkbase>
</FilingSummary>

12 Subsequent Filings that Reference this Filing

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 1/04/22  Centene Corp.                     424B5                  1:510K                                   Broadridge Fin’l So… Inc
 1/04/22  Centene Corp.                     S-8         1/04/22    3:80K                                    Broadridge Fin’l So… Inc
 7/30/21  Centene Corp.                     424B5                  1:1.4M                                   Broadridge Fin’l So… Inc
 7/29/21  Centene Corp.                     424B5                  1:1.4M                                   Broadridge Fin’l So… Inc
 6/25/21  Centene Corp.                     424B5                  1:1.2M                                   Broadridge Fin’l So… Inc
 6/24/21  Centene Corp.                     424B5                  1:1.2M                                   Broadridge Fin’l So… Inc
 5/03/21  Centene Corp.                     S-8         5/03/21    3:110K
 2/22/21  Centene Corp.                     10-K       12/31/20  120:15M
 2/11/21  Centene Corp.                     424B5                  1:1.5M                                   Broadridge Fin’l So… Inc
 2/10/21  Centene Corp.                     424B5                  1:1.5M                                   Broadridge Fin’l So… Inc
 9/24/20  Centene Corp.                     424B5                  1:1.1M                                   Broadridge Fin’l So… Inc
 9/23/20  Centene Corp.                     424B5                  1:1.1M                                   Broadridge Fin’l So… Inc
↑Top
Filing Submission 0001071739-20-000060   –   Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)
Copyright © 2024 Fran Finnegan & Company LLC – All Rights Reserved.
About — Privacy — Redactions — Help — Mon., May 13, 9:32:09.2pm ET