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

Illinois Tool Works Inc – ‘10-K’ for 12/31/19 – ‘XML’

On:  Friday, 2/14/20, at 3:16pm ET   ·   For:  12/31/19   ·   Accession #:  49826-20-20   ·   File #:  1-04797

Previous ‘10-K’:  ‘10-K’ on 2/15/19 for 12/31/18   ·   Next:  ‘10-K’ on 2/12/21 for 12/31/20   ·   Latest:  ‘10-K’ on 2/9/24 for 12/31/23   ·   5 References:   

Find Words in Filings emoji
 		  in    Show  and   ↓Hints

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

 2/14/20  Illinois Tool Works Inc           10-K       12/31/19  114:17M

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                                       HTML   2.22M 
 2: EX-4.J      Instrument Defining the Rights of Security Holders  HTML     37K 
 3: EX-4.K      Instrument Defining the Rights of Security Holders  HTML     95K 
 4: EX-4.L      Instrument Defining the Rights of Security Holders  HTML     93K 
 5: EX-4.M      Instrument Defining the Rights of Security Holders  HTML     93K 
 6: EX-21       Subsidiaries List                                   HTML    171K 
 7: EX-23       Consent of Experts or Counsel                       HTML     32K 
 8: EX-24       Power of Attorney                                   HTML     63K 
 9: EX-31       Certification -- §302 - SOA'02                      HTML     47K 
10: EX-32       Certification -- §906 - SOA'02                      HTML     33K 
76: R1          Cover Page                                          HTML    117K 
35: R2          Statement of Income                                 HTML     74K 
50: R3          Statement of Comprehensive Income                   HTML     48K 
111: R4          Statement of Financial Position                     HTML    130K  
77: R5          Statement of Financial Position (Parenthetical)     HTML     38K 
37: R6          Statement of Changes in Stockholders' Equity        HTML     74K 
52: R7          Statement of Changes in Stockholders' Equity        HTML     33K 
                (Parenthetical)                                                  
113: R8          Statement of Cash Flows                             HTML    145K  
74: R9          Description of Business and Summary of Significant  HTML    127K 
                Accounting Policies                                              
80: R10         Divestitures                                        HTML     61K 
92: R11         Operating Revenue                                   HTML     87K 
57: R12         Legal Settlement                                    HTML     34K 
21: R13         Other Income (Expense)                              HTML     59K 
79: R14         Income Taxes                                        HTML    207K 
91: R15         Net Income Per Share                                HTML     59K 
56: R16         Goodwill and Intangible Assets                      HTML    144K 
20: R17         Leases                                              HTML     54K 
78: R18         Debt                                                HTML    136K 
93: R19         Pension and Other Postretirement Benefits           HTML    349K 
48: R20         Commitments and Contingencies                       HTML     34K 
40: R21         Stockholders' Equity                                HTML     82K 
75: R22         Stock-Based Compensation                            HTML     90K 
114: R23         Other Balance Sheet Information                     HTML     84K  
47: R24         Segment Information                                 HTML    172K 
38: R25         Selected Quarterly Financial Data (Unaudited)       HTML     79K 
73: R26         Description of Business and Summary of Significant  HTML    111K 
                Accounting Policies (Policies)                                   
112: R27         Description of Business and Summary of Significant  HTML    103K  
                Accounting Policies (Tables)                                     
51: R28         Divestitures (Tables)                               HTML     60K 
36: R29         Operating Revenue (Tables)                          HTML     54K 
16: R30         Other Income (Expense) (Tables)                     HTML     54K 
54: R31         Income Taxes (Tables)                               HTML    202K 
94: R32         Net Income Per Share (Tables)                       HTML     57K 
81: R33         Goodwill and Intangible Assets (Tables)             HTML    194K 
18: R34         Leases (Tables)                                     HTML     51K 
55: R35         Debt (Tables)                                       HTML    120K 
95: R36         Pension and Other Postretirement Benefits (Tables)  HTML    354K 
82: R37         Stockholders' Equity (Tables)                       HTML     68K 
19: R38         Stock-Based Compensation (Tables)                   HTML     87K 
53: R39         Other Balance Sheet Information (Tables)            HTML     85K 
32: R40         Segment Information (Tables)                        HTML    170K 
45: R41         Selected Quarterly Financial Data (Unaudited)       HTML     78K 
                (Tables)                                                         
104: R42         Description of Business and Summary of Significant  HTML     83K  
                Accounting Policies - Narrative (Details)                        
65: R43         Description of Business and Summary of Significant  HTML     46K 
                Accounting Policies - Schedule of Changes in                     
                Allowance for Doubtful Accounts (Details)                        
33: R44         Description of Business and Summary of Significant  HTML     45K 
                Accounting Policies - Schedule of Inventory                      
                (Details)                                                        
46: R45         Description of Business and Summary of Significant  HTML     51K 
                Accounting Policies - Schedule of Net Plant and                  
                Equipment (Details)                                              
105: R46         Description of Business and Summary of Significant  HTML     40K  
                Accounting Policies - Schedule of Ranges of Useful               
                Lives (Details)                                                  
67: R47         Description of Business and Summary of Significant  HTML     42K 
                Accounting Policies - Schedule of Changes in                     
                Accrued Warranties (Details)                                     
34: R48         Divestitures (Details)                              HTML     72K 
44: R49         Divestitures - Summary of Assets and Liabilities    HTML     71K 
                Related to Held For Sale Businesses (Details)                    
63: R50         Operating Revenue (Details)                         HTML     34K 
28: R51         Operating Revenue - Summary of Operating Revenue    HTML     62K 
                by Product Category (Details)                                    
84: R52         Legal Settlement (Details)                          HTML     38K 
97: R53         Other Income (Expense) - Schedule of Other Income   HTML     55K 
                (Expense) (Details)                                              
62: R54         Other Income (Expense) - Narrative (Details)        HTML     62K 
27: R55         Income Taxes - Narrative (Details)                  HTML     77K 
83: R56         Income Taxes - Schedule of Components of Provision  HTML     66K 
                for Income Taxes (Details)                                       
96: R57         Income Taxes - Schedule of Income Before Taxes for  HTML     77K 
                Domestic and Foreign Operations and Reconciliation               
                Between U.S. Federal Statutory Tax Rate and                      
                Effective Tax Rate (Details)                                     
64: R58         Income Taxes - Schedule of Components of Deferred   HTML    101K 
                Income Tax Assets and Liabilities (Details)                      
26: R59         Income Taxes - Schedule of Net Operating Loss       HTML     47K 
                Carryforwards (Details)                                          
71: R60         Income Taxes - Schedule of Changes in Amount of     HTML     49K 
                Unrecognized Tax Benefits (Details)                              
108: R61         Income Taxes - Summary of Open Tax Years (Details)  HTML     48K  
42: R62         Net Income Per Share (Details)                      HTML     64K 
30: R63         Net Income Per Share - Narrative (Details)          HTML     34K 
70: R64         Goodwill and Intangible Assets - Schedule of        HTML     71K 
                Changes in Carrying Amount of Goodwill (Details)                 
107: R65         Goodwill and Intangible Assets - Schedule of        HTML     59K  
                Intangible Assets (Details)                                      
41: R66         Goodwill and Intangible Assets - Narrative          HTML     36K 
                (Details)                                                        
29: R67         Goodwill and Intangible Assets - Schedule of        HTML     43K 
                Estimated Future Amortization Expense of                         
                Intangible Assets (Details)                                      
68: R68         Leases - Narrative (Details)                        HTML     57K 
110: R69         Leases - Schedule of Future Maturities of           HTML     54K  
                Operating Lease Liabilities (Details)                            
101: R70         Leases - Schedule of Minimum Lease Payments under   HTML     51K  
                Operating Leases (Details)                                       
86: R71         Debt - Schedule of Short-term Debt (Details)        HTML     38K 
23: R72         Debt - Narrative (Details)                          HTML    174K 
59: R73         Debt - Schedule of Long-term Debt at Carrying       HTML    135K 
                Value and Fair Value (Details)                                   
102: R74         Debt - Schedule of Future Maturities of Long-term   HTML     53K  
                Debt Including Current Maturities of Long-term                   
                Debt (Details)                                                   
87: R75         Pension and Other Postretirement Benefits -         HTML     55K 
                Narrative (Details)                                              
24: R76         Pension and Other Postretirement Benefits -         HTML     56K 
                Summary of Information Regarding Net Periodic                    
                Benefit Cost Included in Statement of Income                     
                Related to Significant Defined Benefit Pension and               
                Other Postretirement Benefit Plans (Details)                     
60: R77         Pension and Other Postretirement Benefits - Change  HTML     68K 
                in Plan Benefit Obligations (Details)                            
99: R78         Pension and Other Postretirement Benefits - Change  HTML    117K 
                in Plan Assets and Reconciliation of Funded Status               
                (Details)                                                        
90: R79         Pension and Other Postretirement Benefits -         HTML     70K 
                Assumptions Used and Trend Rates (Details)                       
100: R80         Pension and Other Postretirement Benefits -         HTML     99K  
                Benefit Plan Assets by Category and Valuation                    
                Methodology (Details)                                            
85: R81         Pension and Other Postretirement Benefits -         HTML     49K 
                Expected Future Benefit Payments (Details)                       
22: R82         Stockholders' Equity - Narrative (Details)          HTML     91K 
58: R83         Stockholders' Equity - Changes in Accumulated       HTML     60K 
                Other Comprehensive Income (Loss) (Details)                      
103: R84         Stock-Based Compensation - Narrative (Details)      HTML     71K  
88: R85         Stock-Based Compensation - Summary of Stock-based   HTML     39K 
                Compensation Expense (Details)                                   
25: R86         Stock-Based Compensation - Summary of Activity      HTML     50K 
                Related to Non-vested RSUs (Details)                             
61: R87         Stock-Based Compensation - Summary of Stock Option  HTML     74K 
                Activity (Details)                                               
98: R88         Stock-Based Compensation - Summary of Assumptions   HTML     48K 
                Used in Option Valuations (Details)                              
89: R89         Other Balance Sheet Information (Details)           HTML    102K 
72: R90         Segment Information - Narrative (Details)           HTML     47K 
109: R91         Segment Information - Summary of Segment            HTML    100K  
                Information (Details)                                            
43: R92         Segment Information - Summary of Enterprise-wide    HTML     54K 
                Information (Details)                                            
31: R93         Selected Quarterly Financial Data (Unaudited)       HTML     60K 
                (Details)                                                        
106: R9999       Uncategorized Items - itw-20191231x10k.htm          HTML     32K  
49: XML         IDEA XML File -- Filing Summary                      XML    207K 
39: XML         XBRL Instance -- itw-20191231x10k_htm                XML   4.72M 
17: EXCEL       IDEA Workbook of Financial Reports                  XLSX    125K 
12: EX-101.CAL  XBRL Calculations -- itw-20191231_cal                XML    383K 
13: EX-101.DEF  XBRL Definitions -- itw-20191231_def                 XML    888K 
14: EX-101.LAB  XBRL Labels -- itw-20191231_lab                      XML   2.53M 
15: EX-101.PRE  XBRL Presentations -- itw-20191231_pre               XML   1.49M 
11: EX-101.SCH  XBRL Schema -- itw-20191231                          XSD    226K 
66: JSON        XBRL Instance as JSON Data -- MetaLinks              538±   807K 
69: ZIP         XBRL Zipped Folder -- 0000049826-20-000020-xbrl      Zip    526K

‘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> 453 </ContextCount>
<ElementCount> 590 </ElementCount>
<EntityCount> 1 </EntityCount>
<FootnotesReported> false </FootnotesReported>
<SegmentCount> 126 </SegmentCount>
<ScenarioCount> 0 </ScenarioCount>
<TuplesReported> false </TuplesReported>
<UnitCount> 9 </UnitCount>
<MyReports>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R1.htm </HtmlFileName>
<LongName> 0001000 - Document - Cover Page </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/CoverPage </Role>
<ShortName> Cover Page </ShortName>
<MenuCategory> Cover </MenuCategory>
<Position> 1 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R2.htm </HtmlFileName>
<LongName> 1001000 - Statement - Statement of Income </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StatementOfIncome </Role>
<ShortName> Statement of Income </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 2 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R3.htm </HtmlFileName>
<LongName> 1002000 - Statement - Statement of Comprehensive Income </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StatementOfComprehensiveIncome </Role>
<ShortName> Statement of Comprehensive Income </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 3 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R4.htm </HtmlFileName>
<LongName> 1004000 - Statement - Statement of Financial Position </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StatementOfFinancialPosition </Role>
<ShortName> Statement of Financial Position </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 4 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R5.htm </HtmlFileName>
<LongName> 1004001 - Statement - Statement of Financial Position (Parenthetical) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StatementOfFinancialPositionParenthetical </Role>
<ShortName> Statement of Financial Position (Parenthetical) </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 5 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R6.htm </HtmlFileName>
<LongName> 1005000 - Statement - Statement of Changes in Stockholders' Equity </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StatementOfChangesInStockholdersEquity </Role>
<ShortName> Statement of Changes in Stockholders' Equity </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 6 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R7.htm </HtmlFileName>
<LongName> 1005001 - Statement - Statement of Changes in Stockholders' Equity (Parenthetical) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StatementOfChangesInStockholdersEquityParenthetical </Role>
<ShortName> Statement of Changes in Stockholders' Equity (Parenthetical) </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 7 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R8.htm </HtmlFileName>
<LongName> 1006000 - Statement - Statement of Cash Flows </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StatementOfCashFlows </Role>
<ShortName> Statement of Cash Flows </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 8 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R9.htm </HtmlFileName>
<LongName> 2101100 - Disclosure - Description of Business and Summary of Significant Accounting Policies </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPolicies </Role>
<ShortName> Description of Business and Summary of Significant Accounting Policies </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 9 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R10.htm </HtmlFileName>
<LongName> 2105100 - Disclosure - Divestitures </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/Divestitures </Role>
<ShortName> Divestitures </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 10 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R11.htm </HtmlFileName>
<LongName> 2106100 - Disclosure - Operating Revenue </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/OperatingRevenue </Role>
<ShortName> Operating Revenue </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 11 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R12.htm </HtmlFileName>
<LongName> 2111100 - Disclosure - Legal Settlement </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/LegalSettlement </Role>
<ShortName> Legal Settlement </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 12 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R13.htm </HtmlFileName>
<LongName> 2112100 - Disclosure - Other Income (Expense) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/OtherIncomeExpense </Role>
<ShortName> Other Income (Expense) </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 13 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R14.htm </HtmlFileName>
<LongName> 2113100 - Disclosure - Income Taxes </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/IncomeTaxes </Role>
<ShortName> Income Taxes </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 14 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R15.htm </HtmlFileName>
<LongName> 2119100 - Disclosure - Net Income Per Share </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/NetIncomePerShare </Role>
<ShortName> Net Income Per Share </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 15 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R16.htm </HtmlFileName>
<LongName> 2124100 - Disclosure - Goodwill and Intangible Assets </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/GoodwillAndIntangibleAssets </Role>
<ShortName> Goodwill and Intangible Assets </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 16 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R17.htm </HtmlFileName>
<LongName> 2125100 - Disclosure - Leases </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/Leases </Role>
<ShortName> Leases </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 17 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R18.htm </HtmlFileName>
<LongName> 2127100 - Disclosure - Debt </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/Debt </Role>
<ShortName> Debt </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 18 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R19.htm </HtmlFileName>
<LongName> 2128100 - Disclosure - Pension and Other Postretirement Benefits </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/PensionAndOtherPostretirementBenefits </Role>
<ShortName> Pension and Other Postretirement Benefits </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 19 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R20.htm </HtmlFileName>
<LongName> 2129100 - Disclosure - Commitments and Contingencies </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/CommitmentsAndContingencies </Role>
<ShortName> Commitments and Contingencies </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 20 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R21.htm </HtmlFileName>
<LongName> 2130100 - Disclosure - Stockholders' Equity </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StockholdersEquity </Role>
<ShortName> Stockholders' Equity </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 21 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R22.htm </HtmlFileName>
<LongName> 2131100 - Disclosure - Stock-Based Compensation </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StockBasedCompensation </Role>
<ShortName> Stock-Based Compensation </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 22 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R23.htm </HtmlFileName>
<LongName> 2132100 - Disclosure - Other Balance Sheet Information </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/OtherBalanceSheetInformation </Role>
<ShortName> Other Balance Sheet Information </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 23 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R24.htm </HtmlFileName>
<LongName> 2133100 - Disclosure - Segment Information </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/SegmentInformation </Role>
<ShortName> Segment Information </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 24 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R25.htm </HtmlFileName>
<LongName> 2134100 - Disclosure - Selected Quarterly Financial Data (Unaudited) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/SelectedQuarterlyFinancialDataUnaudited </Role>
<ShortName> Selected Quarterly Financial Data (Unaudited) </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 25 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R26.htm </HtmlFileName>
<LongName> 2201201 - Disclosure - Description of Business and Summary of Significant Accounting Policies (Policies) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesPolicies </Role>
<ShortName> Description of Business and Summary of Significant Accounting Policies (Policies) </ShortName>
<MenuCategory> Policies </MenuCategory>
<ParentRole> http://www.itw.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPolicies </ParentRole>
<Position> 26 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R27.htm </HtmlFileName>
<LongName> 2301302 - Disclosure - Description of Business and Summary of Significant Accounting Policies (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesTables </Role>
<ShortName> Description of Business and Summary of Significant Accounting Policies (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.itw.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPolicies </ParentRole>
<Position> 27 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R28.htm </HtmlFileName>
<LongName> 2305301 - Disclosure - Divestitures (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/DivestituresTables </Role>
<ShortName> Divestitures (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.itw.com/role/Divestitures </ParentRole>
<Position> 28 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R29.htm </HtmlFileName>
<LongName> 2306301 - Disclosure - Operating Revenue (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/OperatingRevenueTables </Role>
<ShortName> Operating Revenue (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.itw.com/role/OperatingRevenue </ParentRole>
<Position> 29 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R30.htm </HtmlFileName>
<LongName> 2312301 - Disclosure - Other Income (Expense) (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/OtherIncomeExpenseTables </Role>
<ShortName> Other Income (Expense) (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.itw.com/role/OtherIncomeExpense </ParentRole>
<Position> 30 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R31.htm </HtmlFileName>
<LongName> 2313301 - Disclosure - Income Taxes (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/IncomeTaxesTables </Role>
<ShortName> Income Taxes (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.itw.com/role/IncomeTaxes </ParentRole>
<Position> 31 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R32.htm </HtmlFileName>
<LongName> 2319301 - Disclosure - Net Income Per Share (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/NetIncomePerShareTables </Role>
<ShortName> Net Income Per Share (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.itw.com/role/NetIncomePerShare </ParentRole>
<Position> 32 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R33.htm </HtmlFileName>
<LongName> 2324301 - Disclosure - Goodwill and Intangible Assets (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/GoodwillAndIntangibleAssetsTables </Role>
<ShortName> Goodwill and Intangible Assets (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.itw.com/role/GoodwillAndIntangibleAssets </ParentRole>
<Position> 33 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R34.htm </HtmlFileName>
<LongName> 2325301 - Disclosure - Leases (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/LeasesTables </Role>
<ShortName> Leases (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.itw.com/role/Leases </ParentRole>
<Position> 34 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R35.htm </HtmlFileName>
<LongName> 2327301 - Disclosure - Debt (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/DebtTables </Role>
<ShortName> Debt (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.itw.com/role/Debt </ParentRole>
<Position> 35 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R36.htm </HtmlFileName>
<LongName> 2328301 - Disclosure - Pension and Other Postretirement Benefits (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/PensionAndOtherPostretirementBenefitsTables </Role>
<ShortName> Pension and Other Postretirement Benefits (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.itw.com/role/PensionAndOtherPostretirementBenefits </ParentRole>
<Position> 36 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R37.htm </HtmlFileName>
<LongName> 2330301 - Disclosure - Stockholders' Equity (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StockholdersEquityTables </Role>
<ShortName> Stockholders' Equity (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.itw.com/role/StockholdersEquity </ParentRole>
<Position> 37 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R38.htm </HtmlFileName>
<LongName> 2331301 - Disclosure - Stock-Based Compensation (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StockBasedCompensationTables </Role>
<ShortName> Stock-Based Compensation (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.itw.com/role/StockBasedCompensation </ParentRole>
<Position> 38 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R39.htm </HtmlFileName>
<LongName> 2332301 - Disclosure - Other Balance Sheet Information (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/OtherBalanceSheetInformationTables </Role>
<ShortName> Other Balance Sheet Information (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.itw.com/role/OtherBalanceSheetInformation </ParentRole>
<Position> 39 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R40.htm </HtmlFileName>
<LongName> 2333301 - Disclosure - Segment Information (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/SegmentInformationTables </Role>
<ShortName> Segment Information (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.itw.com/role/SegmentInformation </ParentRole>
<Position> 40 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R41.htm </HtmlFileName>
<LongName> 2334301 - Disclosure - Selected Quarterly Financial Data (Unaudited) (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/SelectedQuarterlyFinancialDataUnauditedTables </Role>
<ShortName> Selected Quarterly Financial Data (Unaudited) (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.itw.com/role/SelectedQuarterlyFinancialDataUnaudited </ParentRole>
<Position> 41 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R42.htm </HtmlFileName>
<LongName> 2401403 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesNarrativeDetails </Role>
<ShortName> Description of Business and Summary of Significant Accounting Policies - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.itw.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesTables </ParentRole>
<Position> 42 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R43.htm </HtmlFileName>
<LongName> 2401404 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Schedule of Changes in Allowance for Doubtful Accounts (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesScheduleOfChangesInAllowanceForDoubtfulAccountsDetails </Role>
<ShortName> Description of Business and Summary of Significant Accounting Policies - Schedule of Changes in Allowance for Doubtful Accounts (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 43 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R44.htm </HtmlFileName>
<LongName> 2401405 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Schedule of Inventory (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesScheduleOfInventoryDetails </Role>
<ShortName> Description of Business and Summary of Significant Accounting Policies - Schedule of Inventory (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 44 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R45.htm </HtmlFileName>
<LongName> 2401406 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Schedule of Net Plant and Equipment (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesScheduleOfNetPlantAndEquipmentDetails </Role>
<ShortName> Description of Business and Summary of Significant Accounting Policies - Schedule of Net Plant and Equipment (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 45 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R46.htm </HtmlFileName>
<LongName> 2401407 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Schedule of Ranges of Useful Lives (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesScheduleOfRangesOfUsefulLivesDetails </Role>
<ShortName> Description of Business and Summary of Significant Accounting Policies - Schedule of Ranges of Useful Lives (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 46 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R47.htm </HtmlFileName>
<LongName> 2401408 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Schedule of Changes in Accrued Warranties (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesScheduleOfChangesInAccruedWarrantiesDetails </Role>
<ShortName> Description of Business and Summary of Significant Accounting Policies - Schedule of Changes in Accrued Warranties (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 47 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R48.htm </HtmlFileName>
<LongName> 2405402 - Disclosure - Divestitures (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/DivestituresDetails </Role>
<ShortName> Divestitures (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.itw.com/role/DivestituresTables </ParentRole>
<Position> 48 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R49.htm </HtmlFileName>
<LongName> 2405403 - Disclosure - Divestitures - Summary of Assets and Liabilities Related to Held For Sale Businesses (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/DivestituresSummaryOfAssetsAndLiabilitiesRelatedToHeldForSaleBusinessesDetails </Role>
<ShortName> Divestitures - Summary of Assets and Liabilities Related to Held For Sale Businesses (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 49 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R50.htm </HtmlFileName>
<LongName> 2406402 - Disclosure - Operating Revenue (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/OperatingRevenueDetails </Role>
<ShortName> Operating Revenue (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.itw.com/role/OperatingRevenueTables </ParentRole>
<Position> 50 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R51.htm </HtmlFileName>
<LongName> 2406403 - Disclosure - Operating Revenue - Summary of Operating Revenue by Product Category (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/OperatingRevenueSummaryOfOperatingRevenueByProductCategoryDetails </Role>
<ShortName> Operating Revenue - Summary of Operating Revenue by Product Category (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 51 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R52.htm </HtmlFileName>
<LongName> 2411401 - Disclosure - Legal Settlement (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/LegalSettlementDetails </Role>
<ShortName> Legal Settlement (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.itw.com/role/LegalSettlement </ParentRole>
<Position> 52 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R53.htm </HtmlFileName>
<LongName> 2412402 - Disclosure - Other Income (Expense) - Schedule of Other Income (Expense) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/OtherIncomeExpenseScheduleOfOtherIncomeExpenseDetails </Role>
<ShortName> Other Income (Expense) - Schedule of Other Income (Expense) (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.itw.com/role/OtherIncomeExpenseTables </ParentRole>
<Position> 53 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R54.htm </HtmlFileName>
<LongName> 2412403 - Disclosure - Other Income (Expense) - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/OtherIncomeExpenseNarrativeDetails </Role>
<ShortName> Other Income (Expense) - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.itw.com/role/OtherIncomeExpenseTables </ParentRole>
<Position> 54 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R55.htm </HtmlFileName>
<LongName> 2413402 - Disclosure - Income Taxes - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/IncomeTaxesNarrativeDetails </Role>
<ShortName> Income Taxes - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 55 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R56.htm </HtmlFileName>
<LongName> 2413403 - Disclosure - Income Taxes - Schedule of Components of Provision for Income Taxes (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/IncomeTaxesScheduleOfComponentsOfProvisionForIncomeTaxesDetails </Role>
<ShortName> Income Taxes - Schedule of Components of Provision for Income Taxes (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 56 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R57.htm </HtmlFileName>
<LongName> 2413404 - Disclosure - Income Taxes - Schedule of Income Before Taxes for Domestic and Foreign Operations and Reconciliation Between U.S. Federal Statutory Tax Rate and Effective Tax Rate (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/IncomeTaxesScheduleOfIncomeBeforeTaxesForDomesticAndForeignOperationsAndReconciliationBetweenUSFederalStatutoryTaxRateAndEffectiveTaxRateDetails </Role>
<ShortName> Income Taxes - Schedule of Income Before Taxes for Domestic and Foreign Operations and Reconciliation Between U.S. Federal Statutory Tax Rate and Effective Tax Rate (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 57 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R58.htm </HtmlFileName>
<LongName> 2413405 - Disclosure - Income Taxes - Schedule of Components of Deferred Income Tax Assets and Liabilities (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/IncomeTaxesScheduleOfComponentsOfDeferredIncomeTaxAssetsAndLiabilitiesDetails </Role>
<ShortName> Income Taxes - Schedule of Components of Deferred Income Tax Assets and Liabilities (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 58 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R59.htm </HtmlFileName>
<LongName> 2413406 - Disclosure - Income Taxes - Schedule of Net Operating Loss Carryforwards (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/IncomeTaxesScheduleOfNetOperatingLossCarryforwardsDetails </Role>
<ShortName> Income Taxes - Schedule of Net Operating Loss Carryforwards (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 59 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R60.htm </HtmlFileName>
<LongName> 2413407 - Disclosure - Income Taxes - Schedule of Changes in Amount of Unrecognized Tax Benefits (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/IncomeTaxesScheduleOfChangesInAmountOfUnrecognizedTaxBenefitsDetails </Role>
<ShortName> Income Taxes - Schedule of Changes in Amount of Unrecognized Tax Benefits (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 60 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R61.htm </HtmlFileName>
<LongName> 2413408 - Disclosure - Income Taxes - Summary of Open Tax Years (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/IncomeTaxesSummaryOfOpenTaxYearsDetails </Role>
<ShortName> Income Taxes - Summary of Open Tax Years (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 61 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R62.htm </HtmlFileName>
<LongName> 2419402 - Disclosure - Net Income Per Share (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/NetIncomePerShareDetails </Role>
<ShortName> Net Income Per Share (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.itw.com/role/NetIncomePerShareTables </ParentRole>
<Position> 62 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R63.htm </HtmlFileName>
<LongName> 2419403 - Disclosure - Net Income Per Share - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/NetIncomePerShareNarrativeDetails </Role>
<ShortName> Net Income Per Share - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 63 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R64.htm </HtmlFileName>
<LongName> 2424402 - Disclosure - Goodwill and Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/GoodwillAndIntangibleAssetsScheduleOfChangesInCarryingAmountOfGoodwillDetails </Role>
<ShortName> Goodwill and Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 64 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R65.htm </HtmlFileName>
<LongName> 2424403 - Disclosure - Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/GoodwillAndIntangibleAssetsScheduleOfIntangibleAssetsDetails </Role>
<ShortName> Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 65 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R66.htm </HtmlFileName>
<LongName> 2424404 - Disclosure - Goodwill and Intangible Assets - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/GoodwillAndIntangibleAssetsNarrativeDetails </Role>
<ShortName> Goodwill and Intangible Assets - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 66 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R67.htm </HtmlFileName>
<LongName> 2424405 - Disclosure - Goodwill and Intangible Assets - Schedule of Estimated Future Amortization Expense of Intangible Assets (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/GoodwillAndIntangibleAssetsScheduleOfEstimatedFutureAmortizationExpenseOfIntangibleAssetsDetails </Role>
<ShortName> Goodwill and Intangible Assets - Schedule of Estimated Future Amortization Expense of Intangible Assets (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 67 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R68.htm </HtmlFileName>
<LongName> 2425402 - Disclosure - Leases - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/LeasesNarrativeDetails </Role>
<ShortName> Leases - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 68 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R69.htm </HtmlFileName>
<LongName> 2425403 - Disclosure - Leases - Schedule of Future Maturities of Operating Lease Liabilities (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/LeasesScheduleOfFutureMaturitiesOfOperatingLeaseLiabilitiesDetails </Role>
<ShortName> Leases - Schedule of Future Maturities of Operating Lease Liabilities (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 69 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R70.htm </HtmlFileName>
<LongName> 2425404 - Disclosure - Leases - Schedule of Minimum Lease Payments under Operating Leases (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/LeasesScheduleOfMinimumLeasePaymentsUnderOperatingLeasesDetails </Role>
<ShortName> Leases - Schedule of Minimum Lease Payments under Operating Leases (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 70 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R71.htm </HtmlFileName>
<LongName> 2427402 - Disclosure - Debt - Schedule of Short-term Debt (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/DebtScheduleOfShortTermDebtDetails </Role>
<ShortName> Debt - Schedule of Short-term Debt (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 71 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R72.htm </HtmlFileName>
<LongName> 2427403 - Disclosure - Debt - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/DebtNarrativeDetails </Role>
<ShortName> Debt - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 72 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R73.htm </HtmlFileName>
<LongName> 2427404 - Disclosure - Debt - Schedule of Long-term Debt at Carrying Value and Fair Value (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/DebtScheduleOfLongTermDebtAtCarryingValueAndFairValueDetails </Role>
<ShortName> Debt - Schedule of Long-term Debt at Carrying Value and Fair Value (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 73 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R74.htm </HtmlFileName>
<LongName> 2427405 - Disclosure - Debt - Schedule of Future Maturities of Long-term Debt Including Current Maturities of Long-term Debt (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/DebtScheduleOfFutureMaturitiesOfLongTermDebtIncludingCurrentMaturitiesOfLongTermDebtDetails </Role>
<ShortName> Debt - Schedule of Future Maturities of Long-term Debt Including Current Maturities of Long-term Debt (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 74 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R75.htm </HtmlFileName>
<LongName> 2428402 - Disclosure - Pension and Other Postretirement Benefits - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/PensionAndOtherPostretirementBenefitsNarrativeDetails </Role>
<ShortName> Pension and Other Postretirement Benefits - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 75 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R76.htm </HtmlFileName>
<LongName> 2428403 - Disclosure - Pension and Other Postretirement Benefits - Summary of Information Regarding Net Periodic Benefit Cost Included in Statement of Income Related to Significant Defined Benefit Pension and Other Postretirement Benefit Plans (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/PensionAndOtherPostretirementBenefitsSummaryOfInformationRegardingNetPeriodicBenefitCostIncludedInStatementOfIncomeRelatedToSignificantDefinedBenefitPensionAndOtherPostretirementBenefitPlansDetails </Role>
<ShortName> Pension and Other Postretirement Benefits - Summary of Information Regarding Net Periodic Benefit Cost Included in Statement of Income Related to Significant Defined Benefit Pension and Other Postretirement Benefit Plans (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 76 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R77.htm </HtmlFileName>
<LongName> 2428404 - Disclosure - Pension and Other Postretirement Benefits - Change in Plan Benefit Obligations (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/PensionAndOtherPostretirementBenefitsChangeInPlanBenefitObligationsDetails </Role>
<ShortName> Pension and Other Postretirement Benefits - Change in Plan Benefit Obligations (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 77 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R78.htm </HtmlFileName>
<LongName> 2428405 - Disclosure - Pension and Other Postretirement Benefits - Change in Plan Assets and Reconciliation of Funded Status (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/PensionAndOtherPostretirementBenefitsChangeInPlanAssetsAndReconciliationOfFundedStatusDetails </Role>
<ShortName> Pension and Other Postretirement Benefits - Change in Plan Assets and Reconciliation of Funded Status (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 78 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R79.htm </HtmlFileName>
<LongName> 2428406 - Disclosure - Pension and Other Postretirement Benefits - Assumptions Used and Trend Rates (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/PensionAndOtherPostretirementBenefitsAssumptionsUsedAndTrendRatesDetails </Role>
<ShortName> Pension and Other Postretirement Benefits - Assumptions Used and Trend Rates (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 79 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R80.htm </HtmlFileName>
<LongName> 2428407 - Disclosure - Pension and Other Postretirement Benefits - Benefit Plan Assets by Category and Valuation Methodology (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/PensionAndOtherPostretirementBenefitsBenefitPlanAssetsByCategoryAndValuationMethodologyDetails </Role>
<ShortName> Pension and Other Postretirement Benefits - Benefit Plan Assets by Category and Valuation Methodology (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 80 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R81.htm </HtmlFileName>
<LongName> 2428408 - Disclosure - Pension and Other Postretirement Benefits - Expected Future Benefit Payments (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/PensionAndOtherPostretirementBenefitsExpectedFutureBenefitPaymentsDetails </Role>
<ShortName> Pension and Other Postretirement Benefits - Expected Future Benefit Payments (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 81 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R82.htm </HtmlFileName>
<LongName> 2430402 - Disclosure - Stockholders' Equity - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StockholdersEquityNarrativeDetails </Role>
<ShortName> Stockholders' Equity - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 82 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R83.htm </HtmlFileName>
<LongName> 2430403 - Disclosure - Stockholders' Equity - Changes in Accumulated Other Comprehensive Income (Loss) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StockholdersEquityChangesInAccumulatedOtherComprehensiveIncomeLossDetails </Role>
<ShortName> Stockholders' Equity - Changes in Accumulated Other Comprehensive Income (Loss) (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 83 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R84.htm </HtmlFileName>
<LongName> 2431402 - Disclosure - Stock-Based Compensation - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StockBasedCompensationNarrativeDetails </Role>
<ShortName> Stock-Based Compensation - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 84 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R85.htm </HtmlFileName>
<LongName> 2431403 - Disclosure - Stock-Based Compensation - Summary of Stock-based Compensation Expense (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StockBasedCompensationSummaryOfStockBasedCompensationExpenseDetails </Role>
<ShortName> Stock-Based Compensation - Summary of Stock-based Compensation Expense (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 85 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R86.htm </HtmlFileName>
<LongName> 2431404 - Disclosure - Stock-Based Compensation - Summary of Activity Related to Non-vested RSUs (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StockBasedCompensationSummaryOfActivityRelatedToNonVestedRsusDetails </Role>
<ShortName> Stock-Based Compensation - Summary of Activity Related to Non-vested RSUs (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 86 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R87.htm </HtmlFileName>
<LongName> 2431405 - Disclosure - Stock-Based Compensation - Summary of Stock Option Activity (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StockBasedCompensationSummaryOfStockOptionActivityDetails </Role>
<ShortName> Stock-Based Compensation - Summary of Stock Option Activity (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 87 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R88.htm </HtmlFileName>
<LongName> 2431406 - Disclosure - Stock-Based Compensation - Summary of Assumptions Used in Option Valuations (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/StockBasedCompensationSummaryOfAssumptionsUsedInOptionValuationsDetails </Role>
<ShortName> Stock-Based Compensation - Summary of Assumptions Used in Option Valuations (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 88 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R89.htm </HtmlFileName>
<LongName> 2432402 - Disclosure - Other Balance Sheet Information (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/OtherBalanceSheetInformationDetails </Role>
<ShortName> Other Balance Sheet Information (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.itw.com/role/OtherBalanceSheetInformationTables </ParentRole>
<Position> 89 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R90.htm </HtmlFileName>
<LongName> 2433402 - Disclosure - Segment Information - Narrative (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/SegmentInformationNarrativeDetails </Role>
<ShortName> Segment Information - Narrative (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 90 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R91.htm </HtmlFileName>
<LongName> 2433403 - Disclosure - Segment Information - Summary of Segment Information (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/SegmentInformationSummaryOfSegmentInformationDetails </Role>
<ShortName> Segment Information - Summary of Segment Information (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 91 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R92.htm </HtmlFileName>
<LongName> 2433404 - Disclosure - Segment Information - Summary of Enterprise-wide Information (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/SegmentInformationSummaryOfEnterpriseWideInformationDetails </Role>
<ShortName> Segment Information - Summary of Enterprise-wide Information (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 92 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R93.htm </HtmlFileName>
<LongName> 2434402 - Disclosure - Selected Quarterly Financial Data (Unaudited) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.itw.com/role/SelectedQuarterlyFinancialDataUnauditedDetails </Role>
<ShortName> Selected Quarterly Financial Data (Unaudited) (Details) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.itw.com/role/SelectedQuarterlyFinancialDataUnauditedTables </ParentRole>
<Position> 93 </Position>
</Report>
<Report instance="itw-20191231x10k.htm">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R9999.htm </HtmlFileName>
<LongName> Uncategorized Items - itw-20191231x10k.htm </LongName>
<ReportType> Sheet </ReportType>
<Role> http://xbrl.sec.gov/role/uncategorizedFacts </Role>
<ShortName> Uncategorized Items - itw-20191231x10k.htm </ShortName>
<MenuCategory> Cover </MenuCategory>
<Position> 94 </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="itw-20191231x10k.htm"> itw-20191231x10k.htm </File>
<File> exhibit4jdescriptionof.htm </File>
<File> exhibit4kdescriptionof.htm </File>
<File> exhibit4ldescriptionof.htm </File>
<File> exhibit4mdescriptionof.htm </File>
<File> itw-20191231.xsd </File>
<File> itw-20191231_cal.xml </File>
<File> itw-20191231_def.xml </File>
<File> itw-20191231_lab.xml </File>
<File> itw-20191231_pre.xml </File>
<File> itw-20191231xex21.htm </File>
<File> itw-20191231xex23.htm </File>
<File> itw-20191231xex24.htm </File>
<File> itw-20191231xex31.htm </File>
<File> itw-20191231xex32.htm </File>
</InputFiles>
<SupplementalFiles>
<File> graphfor10ka02.jpg </File>
</SupplementalFiles>
<BaseTaxonomies>
<BaseTaxonomy> http://fasb.org/us-gaap/2019-01-31 </BaseTaxonomy>
<BaseTaxonomy> http://fasb.org/srt/2019-01-31 </BaseTaxonomy>
<BaseTaxonomy> http://xbrl.sec.gov/dei/2019-01-31 </BaseTaxonomy>
<BaseTaxonomy> http://xbrl.sec.gov/country/2017-01-31 </BaseTaxonomy>
</BaseTaxonomies>
<HasPresentationLinkbase> true </HasPresentationLinkbase>
<HasCalculationLinkbase> true </HasCalculationLinkbase>
</FilingSummary>

5 Subsequent Filings that Reference this Filing

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

 2/09/24  Illinois Tool Works Inc.          10-K       12/31/23  109:13M
 2/10/23  Illinois Tool Works Inc.          10-K       12/31/22  108:14M
 2/11/22  Illinois Tool Works Inc.          10-K       12/31/21  107:14M
 2/12/21  Illinois Tool Works Inc.          10-K       12/31/20  108:14M
 8/07/20  Illinois Tool Works Inc.          S-3ASR      8/07/20    6:700K                                   Donnelley … Solutions/FA
↑Top
Filing Submission 0000049826-20-000020   –   Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)
Copyright © 2024 Fran Finnegan & Company LLC – All Rights Reserved.
About — Privacy — Redactions — Help — Wed., May 1, 12:03:51.1am ET