Exelon Corp, et al. – ‘10-K’ for 12/31/18 – ‘EX-101.CAL’

On:  Friday, 2/8/19, at 3:11pm ET   ·   For:  12/31/18   ·   Accession #:  1628280-19-1107   ·   File #s:  0-16844, 1-01072, 1-01405, 1-01839, 1-01910, 1-03559, 1-16169, 1-31403, 333-85496

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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   9.04M 
 2: EX-21.1     Subsidiaries - Exelon Corporation                   HTML    173K 
 3: EX-21.2     Subsidiaries - Exelon Generation Company, LLC       HTML    158K 
 4: EX-21.3     Subsidiaries - Commonwealth Edison Company          HTML     94K 
 5: EX-21.4     Subsidiaries - Peco Energy Company                  HTML     95K 
 6: EX-21.5     Subsidiaries - Baltimore Gas and Electric Company   HTML     94K 
 7: EX-21.6     Subsidiaries - Pepco Holdings LLC                   HTML     95K 
 8: EX-21.7     Subsidiaries - Potomac Electric Power Company       HTML     94K 
 9: EX-21.8     Subsidiaries - Delmarva Power & Light Company       HTML     94K 
10: EX-21.9     Subsidiaries - Atlantic City Electric Company       HTML     94K 
11: EX-23.1     Consent of Independent Registered Public            HTML     95K 
                Accountants - Exelon Corporation                                 
12: EX-23.2     Consent of Independent Registered Public            HTML     95K 
                Accountants - Exelon Generation Company                          
13: EX-23.3     Consent of Independent Registered Public            HTML     95K 
                Accountants - Commonwealth Edison Co                             
14: EX-23.4     Consent of Independent Registered Public            HTML     95K 
                Accountants - Peco Energy Company                                
15: EX-23.5     Consent of Independent Registered Public            HTML     95K 
                Accountants - Baltimore Gas & Electric                           
16: EX-23.6     Consent of Independent Registered Public            HTML     95K 
                Accountants - Potomac Electric Power Co                          
17: EX-23.7     Consent of Independent Registered Public            HTML     95K 
                Accountants - Delmarva Power & Light Co                          
18: EX-23.8     Consent of Independent Registered Public            HTML     95K 
                Accountants - Atlantic City Electric Co                          
19: EX-24.1     Power of Attorney - Anthony K. Anderson             HTML     95K 
28: EX-24.10    Power of Attorney - Richard W. Mies                 HTML     95K 
29: EX-24.11    Power of Attorney - John W. Rogers, Jr.             HTML     95K 
30: EX-24.12    Power of Attorney - Mayo A. Shattuck Iii            HTML     95K 
31: EX-24.13    Power of Attorney - Stephen D. Steinour             HTML     95K 
32: EX-24.14    Power of Attorney - John F. Young                   HTML     95K 
33: EX-24.15    Power of Attorney - James W. Compton                HTML     95K 
34: EX-24.16    Power of Attorney - Christopher M. Crane            HTML     95K 
35: EX-24.17    Power of Attorney - A. Steven Crown                 HTML     95K 
36: EX-24.18    Power of Attorney - Nicholas Debenedictis           HTML     95K 
37: EX-24.19    Power of Attorney - Joseph Dominguez                HTML     95K 
20: EX-24.2     Power of Attorney - Ann C. Berzin                   HTML     95K 
38: EX-24.20    Power of Attorney - Peter V. Fazio, Jr.             HTML     95K 
39: EX-24.21    Power of Attorney - Michael H. Moskow               HTML     95K 
40: EX-24.22    Power of Attorney - Anne R. Pramaggiore             HTML     95K 
41: EX-24.25    Power of Attorney - Christopher M. Crane            HTML     95K 
42: EX-24.26    Power of Attorney - M. Walter D'Alessio             HTML     95K 
43: EX-24.27    Power of Attorney - Nicholas Debenedictis           HTML     95K 
44: EX-24.28    Power of Attorney - Nelson A. Diaz                  HTML     95K 
45: EX-24.29    Power of Attorney - John S. Grady                   HTML     95K 
21: EX-24.3     Power of Attorney - Laurie Brlas                    HTML     95K 
46: EX-24.30    Power of Attorney - Rosemarie B. Greco              HTML     95K 
47: EX-24.31    Power of Attorney - Michael A. Innocenzo            HTML     95K 
48: EX-24.32    Power of Attorney - Charisse R. Lillie              HTML     95K 
49: EX-24.33    Power of Attorney - Anne R. Pramaggiore             HTML     95K 
50: EX-24.34    Power of Attorney - Ann C. Berzin                   HTML     95K 
51: EX-24.35    Power of Attorney - Calvin G. Butler, Jr.           HTML     95K 
52: EX-24.36    Power of Attorney - Christopher M. Crane            HTML     95K 
53: EX-24.37    Power of Attorney - Michael E. Cryor                HTML     95K 
54: EX-24.38    Power of Attorney - James R. Curtiss                HTML     95K 
55: EX-24.39    Power of Attorney - Joseph Haskins, Jr.             HTML     95K 
22: EX-24.4     Power of Attorney - Christopher M. Crane            HTML     95K 
56: EX-24.40    Power of Attorney - Anne R. Pramaggiore             HTML     95K 
57: EX-24.41    Power of Attorney - Michael D. Sullivan             HTML     95K 
58: EX-24.42    Power of Attorney - Maria Harris Tildon             HTML     95K 
59: EX-24.43    Power of Attorney - Christopher M. Crane            HTML     95K 
60: EX-24.44    Power of Attorney - Linda Cropp                     HTML     95K 
61: EX-24.45    Power of Attorney - Michael E. Cryor                HTML     95K 
62: EX-24.46    Power of Attorney - Ernest Dianastasis              HTML     95K 
63: EX-24.47    Power of Attorney - Debra P. Dilorenzo              HTML     95K 
64: EX-24.48    Power of Attorney - Anne R. Pramaggiore             HTML     95K 
65: EX-24.49    Power of Attorney - David M. Velazquez              HTML     95K 
23: EX-24.5     Power of Attorney - Yves C. De Balmann              HTML     95K 
66: EX-24.50    Power of Attorney - J. Tyler Anthony                HTML     95K 
67: EX-24.51    Power of Attorney - Phillip S. Barnett              HTML     95K 
68: EX-24.52    Power of Attorney - Christopher M. Crane            HTML     95K 
69: EX-24.53    Power of Attorney - Melissa A. Lavinson             HTML     95K 
70: EX-24.54    Power of Attorney - Kevin M. McGowan                HTML     95K 
71: EX-24.55    Power of Attorney - Anne R. Pramaggiore             HTML     95K 
72: EX-24.56    Power of Attorney - David M. Velazquez              HTML     95K 
73: EX-24.57    Power of Attorney - Anne R. Pramaggiore             HTML     95K 
74: EX-24.58    Power of Attorney - David M. Velazquez              HTML     95K 
75: EX-24.59    Power of Attorney - David M. Velazquez              HTML     95K 
24: EX-24.6     Power of Attorney - Nicholas Debenedictis           HTML     95K 
25: EX-24.7     Power of Attorney - Linda P. Jojo                   HTML     95K 
26: EX-24.8     Power of Attorney - Paul Joskow                     HTML     95K 
27: EX-24.9     Power of Attorney - Robert J. Lawless               HTML     95K 
76: EX-31.1     Certification Filed by Christopher M. Crane for     HTML    100K 
                Exelon Corporation                                               
85: EX-31.10    Certification Filed by David M. Vahos for           HTML    101K 
                Baltimore Gas and Electric Company                               
86: EX-31.11    Certification Filed by David M. Velazquez for       HTML    100K 
                Pepco Holdings LLC                                               
87: EX-31.12    Certification Filed by Phillip S. Barnett for       HTML    100K 
                Pepco Holdings LLC                                               
88: EX-31.13    Certification Filed by David M. Velazquez for       HTML    100K 
                Potomac Electric Power Company                                   
89: EX-31.14    Certification Filed by Phillip S. Barnett for       HTML    100K 
                Potomac Electric Power Company                                   
90: EX-31.15    Certification Filed by David M. Velazquez for       HTML    100K 
                Delmarva Power & Light Company                                   
91: EX-31.16    Certification Filed by Phillip S. Barnett for       HTML    100K 
                Delmarva Power & Light Company                                   
92: EX-31.17    Certification Filed by David M. Velazquez for       HTML    100K 
                Atlantic City Electric Company                                   
93: EX-31.18    Certification Filed by Phillip S. Barnett for       HTML    100K 
                Atlantic City Electric Company                                   
77: EX-31.2     Certification Filed by Joseph Nigro for Exelon      HTML    100K 
                Corporation                                                      
78: EX-31.3     Certification Filed by Kenneth W. Cornew for        HTML    101K 
                Exelon Generation Company, LLC                                   
79: EX-31.4     Certification Filed by Bryan P. Wright for Exelon   HTML    101K 
                Generation Company, LLC                                          
80: EX-31.5     Certification Filed by Joseph Dominguez for         HTML    100K 
                Commonwealth Edison Company                                      
81: EX-31.6     Certification Filed by Jeanne M. Jones for          HTML    101K 
                Commonwealth Edison Company                                      
82: EX-31.7     Certification Filed by Michael A. Innocenzo for     HTML    100K 
                Peco Energy Company                                              
83: EX-31.8     Certification Filed by Robert J. Stefani for Peco   HTML    100K 
                Energy Company                                                   
84: EX-31.9     Certification Filed by Calvin G. Butler, Jr. for    HTML    101K 
                Baltimore Gas and Electric Co                                    
94: EX-32.1     Certification Filed by Christopher M. Crane for     HTML     95K 
                Exelon Corporation                                               
103: EX-32.10    Certification Filed by David M. Vahos for           HTML     95K  
                Baltimore Gas and Electric Company                               
104: EX-32.11    Certification Filed by David M. Velazquez for       HTML     95K  
                Pepco Holdings LLC                                               
105: EX-32.12    Certification Filed by Phillip S. Barnett for       HTML     95K  
                Pepco Holdings LLC                                               
106: EX-32.13    Certification Filed by David M. Velazquez for       HTML     95K  
                Potomac Electric Power Company                                   
107: EX-32.14    Certification Filed by Phillip S. Barnett for       HTML     95K  
                Potomac Electric Power Company                                   
108: EX-32.15    Certification Filed by David M. Velazquez for       HTML     95K  
                Delmarva Power & Light Company                                   
109: EX-32.16    Certification Filed by Phillip S. Barnett for       HTML     95K  
                Delmarva Power & Light Company                                   
110: EX-32.17    Certification Filed by David M. Velazquez for       HTML     95K  
                Atlantic City Electric Company                                   
111: EX-32.18    Certification Filed by Phillip S. Barnett for       HTML     95K  
                Atlantic City Electric Company                                   
95: EX-32.2     Certification Filed by Joseph Nigro for Exelon      HTML     95K 
                Corporation                                                      
96: EX-32.3     Certification Filed by Kenneth W. Cornew for        HTML     95K 
                Exelon Generation Company, LLC                                   
97: EX-32.4     Certification Filed by Bryan P. Wright for Exelon   HTML     95K 
                Generation Company, LLC                                          
98: EX-32.5     Certification Filed by Joseph Dominguez for         HTML     95K 
                Commonwealth Edison Company                                      
99: EX-32.6     Certification Filed by Jeanne M. Jones for          HTML     95K 
                Commonwealth Edison Company                                      
100: EX-32.7     Certification Filed by Michael A. Innocenzo for     HTML     95K  
                Peco Energy Company                                              
101: EX-32.8     Certification Filed by Robert J. Stefani for Peco   HTML     95K  
                Energy Company                                                   
102: EX-32.9     Certification Filed by Calvin G. Butler, Jr. for    HTML     95K  
                Baltimore Gas and Electric Co                                    
118: R1          Document and Entity Information                     HTML    143K  
119: R2          Consolidated Statements of Operations and           HTML    390K  
                Comprehensive Income                                             
120: R3          Consolidated Statements of Cash Flows               HTML    356K  
121: R4          Consolidated Balance Sheets                         HTML    501K  
122: R5          Consolidated Balance Sheets (Parenthetical)         HTML    103K  
123: R6          Consolidated Statement of Changes in Shareholders   HTML    466K  
                Equity                                                           
124: R7          Consolidated Statement of Changes in Shareholders   HTML     96K  
                Equity (Parenthetical)                                           
125: R8          Significant Accounting Policies                     HTML    597K  
126: R9          Variable Interest Entities (All Registrants)        HTML    379K  
127: R10         Revenue Recognition Revenue Recognition (All        HTML    144K  
                Registrants)                                                     
128: R11         Regulatory Matters (All Registrants)                HTML    765K  
129: R12         Mergers, Acquisitions and Dispositions (All         HTML    250K  
                Registrants)                                                     
130: R13         Property, Plant and Equipment (All Registrants)     HTML    449K  
131: R14         Impairment of Long-lived Assets (Exelon and         HTML    111K  
                Generation)                                                      
132: R15         Early Plant Retirements Early Plant Retirements     HTML    163K  
                (Exelon, Generation)                                             
133: R16         Jointly Owned Electric Utility Plant (Exelon,       HTML    162K  
                Generation, PECO, BGE, PHI, Pepco, DPL and ACE)                  
134: R17         Intangible Assets (All Registrants)                 HTML    270K  
135: R18         Fair Value of Financial Assets and Liabilities      HTML   1.94M  
                (All Registrants)                                                
136: R19         Derivative Financial Instruments (All Registrants)  HTML    485K  
137: R20         Debt and Credit Agreements (All Registrants)        HTML    825K  
138: R21         Income Taxes (All Registrants)                      HTML   1.14M  
139: R22         Asset Retirement Obligations (All Registrants)      HTML    241K  
140: R23         Retirement Benefits (All Registrants)               HTML   1.11M  
141: R24         Severance (All Registrants)                         HTML    173K  
142: R25         Shareholder Equity (All Registrants)                HTML    133K  
143: R26         Stock-Based Compensation Plans (All Registrants)    HTML    247K  
144: R27         Earnings Per Share (Exelon)                         HTML    111K  
145: R28         Changes in Accumulated Other Comprehensive Income   HTML    385K  
                (Exelon, Generation, and PECO)                                   
146: R29         Commitments and Contingencies (All Registrants)     HTML    545K  
147: R30         Supplemental Financial Information (All             HTML   1.93M  
                Registrants)                                                     
148: R31         Segment Information (All Registrants)               HTML   1.26M  
149: R32         Related Party Transactions (All Registrants)        HTML    732K  
150: R33         Quarterly Data (Unaudited) (All Registrants)        HTML    331K  
151: R34         Subsequent Events Subsequent Events (Exelon and     HTML    101K  
                Generation)                                                      
152: R35         Schedule I - Condensed Financial Information of     HTML    385K  
                Parent (Exelon Corporate)                                        
153: R36         Schedule II - Valuation and Qualifying Accounts     HTML    641K  
154: R37         Significant Accounting Policies (Policies)          HTML    679K  
155: R38         Earnings Per Share Earnings Per Share (Policies)    HTML     98K  
156: R39         Significant Accounting Policies (Tables)            HTML     99K  
157: R40         Variable Interest Entities (Tables)                 HTML    346K  
158: R41         Revenue Recognition Revenue Recognition (Tables)    HTML    127K  
159: R42         Regulatory Matters (Tables)                         HTML    614K  
160: R43         Mergers, Acquisitions and Dispositions (Tables)     HTML    240K  
161: R44         Property, Plant, and Equipment (Tables)             HTML    450K  
162: R45         Early Plant Retirements Early Plant Retirements     HTML    144K  
                (Tables)                                                         
163: R46         Jointly Owned Electric Utility Plant (Tables)       HTML    161K  
164: R47         Intangible Assets (Tables)                          HTML    260K  
165: R48         Fair Value of Financial Assets and Liabilities      HTML   2.02M  
                (Tables)                                                         
166: R49         Derivative Financial Instruments (Tables)           HTML    451K  
167: R50         Debt and Credit Agreements (Tables)                 HTML    780K  
168: R51         Income Taxes (Tables)                               HTML   1.32M  
169: R52         Asset Retirement Obligations (Tables)               HTML    209K  
170: R53         Retirement Benefits (Tables)                        HTML   1.09M  
171: R54         Severance (Tables)                                  HTML    208K  
172: R55         Shareholders' Equity Shareholder Equity (Tables)    HTML    121K  
173: R56         Stock-Based Compensation Plans (All Registrants)    HTML    248K  
                (Tables)                                                         
174: R57         Earnings Per Share (Tables)                         HTML    109K  
175: R58         Changes in Accumulated Other Comprehensive Income   HTML    388K  
                (Tables)                                                         
176: R59         Commitments and Contingencies (Tables)              HTML    436K  
177: R60         Supplemental Financial Information (Tables)         HTML   1.93M  
178: R61         Segment Information (Tables)                        HTML   1.25M  
179: R62         Related Party Transactions (Tables)                 HTML    727K  
180: R63         Quarterly Data (Unaudited) (Tables)                 HTML    329K  
181: R64         Significant Accounting Policies - Narrative         HTML    114K  
                (Details)                                                        
182: R65         Significant Accounting Policies Balance Sheet       HTML    105K  
                Classification of Deferred Taxes (Details)                       
183: R66         Significant Accounting Policies Revenue Initial     HTML    336K  
                Application Period Cumulative Effect Transition                  
                (Details)                                                        
184: R67         Significant Accounting Policies Expected Right of   HTML    117K  
                Use Assets and Lease Obligations (Details)                       
185: R68         Variable Interest Entities Variable Interest        HTML    180K  
                Entities - Narrative (Details)                                   
186: R69         Variable Interest Entities Variable Interest        HTML    123K  
                Entities - Carrying Amounts and Classification of                
                Consolidated VIE Assets and Liabilities (Details)                
187: R70         Variable Interest Entities Variable Interest        HTML    269K  
                Entities - Assets and Liabilities of VIEs which                  
                Creditors or Beneficiaries have No Recourse                      
                (Details)                                                        
188: R71         Variable Interest Entities Variable Intereste       HTML    139K  
                Entities - Summary of Significant Unconsolidated                 
                VIEs (Details)                                                   
189: R72         Revenue Recognition Revenue Recognition -           HTML    101K  
                Narrative (Details)                                              
190: R73         Revenue Recognition Contract Assets and             HTML    114K  
                Liabilities (Details)                                            
191: R74         Revenue Recognition Performance Obligations         HTML    118K  
                (Details)                                                        
192: R75         Regulatory Matters Regulatory Matters- Narrative    HTML   1.10M  
                (Details)                                                        
193: R76         Regulatory Matters Regulatory Matters - Annual      HTML    223K  
                Electric Distribution/Transmission Filings                       
                (Details)                                                        
194: R77         Regulatory Matters Regulatory Matters - Schedule    HTML    105K  
                of Regulatory Asset Impairment (Details)                         
195: R78         Regulatory Matters Regulatory Matters - Estimated   HTML    185K  
                Commitments related to PJM Agreements (Details)                  
196: R79         Regulatory Matters Regulatory Matters - Schedule    HTML    368K  
                of Regulatory Assets (Details)                                   
197: R80         Regulatory Matters Regulatory Matters - Schedule    HTML    167K  
                of Regulatory Liabilities (Details)                              
198: R81         Regulatory Matters Regulatory Matters -             HTML    110K  
                Capitalized Ratemaking Amounts Not Recognized                    
                (Details)                                                        
199: R82         Regulatory Matters Regulatory Matters - Schedule    HTML    194K  
                of Completed Rate Cases (Details)                                
200: R83         Regulatory Matters Regulatory Matters - Schedule    HTML    110K  
                of Pending Rate Cases (Details)                                  
201: R84         Regulatory Matters Regulatory Matters - Schedule    HTML    139K  
                of TCJA Savings (Details)                                        
202: R85         Regulatory Matters Regulatory Matters - Schedule    HTML    108K  
                of Revenue Increases (Decreases) (Details)                       
203: R86         Mergers, Acquisitions and Dispositions Mergers,     HTML    614K  
                Acquisitions and Dispositions - Narrative                        
                (Details)                                                        
204: R87         Mergers, Acquisitions and Dispositions Purchase     HTML    151K  
                Price Allocation Table - FitzPatrick (Details)                   
205: R88         Mergers, Acquisitions and Dispositions Purchase     HTML    102K  
                Price allocation Table - Con Edison (Details)                    
206: R89         Mergers, Acquisitions and Dispositions Merger       HTML    163K  
                Commitments Table (Details)                                      
207: R90         Mergers, Acquisitions and Dispositions Merger       HTML    103K  
                Transaction Table (Details)                                      
208: R91         Mergers, Acquisitions and Dispositions Purchase     HTML     98K  
                Price Allocation Table - (Phi) (Details)                         
209: R92         Mergers, Acquisitions and Dispositions Merger       HTML    135K  
                Integration Related Costs Table (Details)                        
210: R93         Mergers, Acquisitions and Dispositions Proforma     HTML    109K  
                Impact of Merger (Details)                                       
211: R94         Property, Plant and Equipment Property, Plant and   HTML    318K  
                Equipment - Summary of Property, Plant and                       
                Equipment (Details)                                              
212: R95         Property, Plant and Equipment Property, Plant and   HTML    129K  
                Equipment- Annual Depreciation Provisions as                     
                Percentage of Average Service Life (Details)                     
213: R96         Property, Plant and Equipment Property, Plant and   HTML    112K  
                Equipment- Narrative (Details)                                   
214: R97         Property, Plant and Equipment Property, Plant and   HTML    128K  
                Equipment - Summary of Capitalized Software Costs                
                (Details)                                                        
215: R98         Property, Plant and Equipment Property, Plant and   HTML    137K  
                Equipment - Summary of Capitalized Interest and                  
                AFUDC (Details)                                                  
216: R99         Impairment of Long-lived Assets Impairment of       HTML    139K  
                Long-Lived Assets - Narrative (Details)                          
217: R100        Early Plant Retirements Early Plant Retirements -   HTML    109K  
                Narrative (Details)                                              
218: R101        Early Plant Retirements Early Plant Retirements -   HTML    144K  
                Pretax Expense (Details)                                         
219: R102        Early Plant Retirements Early Plant Retirements -   HTML    116K  
                Implications of Potential Early Plant Retirement                 
                on Balance Sheet (Details)                                       
220: R103        Jointly Owned Electric Utility Plant - Ownership    HTML    191K  
                Interests in Jointly Owned Electric Plants and                   
                Transmission Facilities (Details)                                
221: R104        Intangible Assets - Schedule of Goodwill (Details)  HTML    117K  
222: R105        Intangible Assets - Narrative (Details)             HTML    132K  
223: R106        Intangible Assets - Schedule of Other Intangible    HTML    155K  
                Assets (Details)                                                 
224: R107        Intangible Assets - Summary of Amortization         HTML    120K  
                Expense (Details)                                                
225: R108        Intangible Assets Renewable and Alternative Energy  HTML    145K  
                Credits (Details)                                                
226: R109        Fair Value of Financial Assets and Liabilities      HTML    225K  
                Fair Value of Financial Assets and Liabilities -                 
                Fair Value of Financial Liabilities Recorded at                  
                the Carrying Amount (Details)                                    
227: R110        Fair Value of Financial Assets and Liabilities      HTML    984K  
                Fair Value of Financial Assets and Liabilities -                 
                Fair Value Measurement of Assets and Liabilities,                
                Recurring and Nonrecurring (Details)                             
228: R111        Fair Value of Financial Assets and Liabilities      HTML    243K  
                Fair Value of Financial Assets and Liabilities -                 
                Fair Value Reconciliation of Level 3 Assets and                  
                Liabilities Measured on a Recurring Basis                        
                (Details)                                                        
229: R112        Fair Value of Financial Assets and Liabilities      HTML    125K  
                Fair Value of Financial Assets and Liabilities -                 
                Fair Value Assets and Liabilities Measure on                     
                Recurring Basis Gain Loss Included in Earnings                   
                (Details)                                                        
230: R113        Fair Value of Financial Assets and Liabilities      HTML    161K  
                Fair Value of Financial Assets and Liabilities -                 
                Fair Value Inputs Assets Quantitative Information                
                (Details)                                                        
231: R114        Fair Value of Financial Assets and Liabilities      HTML    105K  
                Fair Value of Financial Assets and Liabilities -                 
                Narrative (Details)                                              
232: R115        Derivative Financial Instruments - Narrative        HTML    195K  
                (Details)                                                        
233: R116        Derivative Financial Instruments - Summary of       HTML    157K  
                Interest Rate and Foreign Currency Hedges                        
                (Details)                                                        
234: R117        Derivative Financial Instruments - Summary of       HTML    105K  
                Gains and Losses on Hedges (Details)                             
235: R118        Derivative Financial Instruments - Summary of       HTML    187K  
                Derivative Fair Value Balances (Details)                         
236: R119        Derivative Financial Instruments - Summary of AOCI  HTML    126K  
                related to Cash Flow Hedges (Details)                            
237: R120        Derivative Financial Instruments - Summary of       HTML    120K  
                Economic Hedges (Details)                                        
238: R121        Derivative Financial Instruments - Summary of       HTML    106K  
                Proprietary Trading Activities (Details)                         
239: R122        Derivative Financial Instruments - Summary of       HTML    128K  
                Credit Risk Exposure (Details)                                   
240: R123        Derivative Financial Instruments - Net Credit       HTML    106K  
                Exposure by Type of Counterparty (Details)                       
241: R124        Derivative Financial Instruments - Summary of       HTML    107K  
                Credit Risk Related Contingent Features (Details)                
242: R125        Derivative Financial Instruments - Schedule of      HTML    118K  
                Notional Amounts Outstanding (Details)                           
243: R126        Debt and Credit Agreements - Commercial Paper       HTML    191K  
                Borrowings Outstanding (Details)                                 
244: R127        Debt and Credit Agreements - Summary of Bank        HTML    193K  
                Commitments, Credit Facility Borrowings and                      
                Available Capacity (Details)                                     
245: R128        Debt and Credit Agreements - Summary of Short-term  HTML    132K  
                Borrowing Activities (Details)                                   
246: R129        Debt and Credit Agreements - Summary of Credit      HTML    130K  
                Facility Thresholds (Details)                                    
247: R130        Debt and Credit Agreements - Summary of Interest    HTML    110K  
                Coverage Ratios (Details)                                        
248: R131        Debt and Credit Agreements - Summary of             HTML    501K  
                Outstanding Long-term Debt (Details)                             
249: R132        Debt and Credit Agreements - Schedule of Long-term  HTML    189K  
                Debt Maturities (Details)                                        
250: R133        Debt and Credit Agreements - Narrative (Details)    HTML    406K  
251: R134        Income Taxes Deferred Tax Revision (Details)        HTML    155K  
252: R135        Income Taxes - Components of Income Tax Expense     HTML    179K  
                (Benefit) from Continuing Operations (Details)                   
253: R136        Income Taxes - Reconciliation to Effective Tax      HTML    270K  
                Rate (Details)                                                   
254: R137        Income Taxes - Tax Effects of Temporary             HTML    187K  
                Differences and Carryforwards (Details)                          
255: R138        Income Taxes - Schedule of Carryforwards and        HTML    144K  
                Corresponding Valuation Allowances (Details)                     
256: R139        Income Taxes - Reconciliation of Unrecognized Tax   HTML    168K  
                Benefits (Details)                                               
257: R140        Income Taxes - Summary of Interest Receivable       HTML    118K  
                (Payable) (Details)                                              
258: R141        Income Taxes - Summary of Interest Expense          HTML    127K  
                (Income) (Details)                                               
259: R142        Income Taxes - Narrative (Details)                  HTML    343K  
260: R143        Asset Retirement Obligations - Nuclear              HTML    144K  
                Decommissioning Asset Retirement Obligation                      
                Rollforward (Details)                                            
261: R144        Asset Retirement Obligations - Narrative (Details)  HTML    170K  
262: R145        Asset Retirement Obligations - Unrealized Gain on   HTML    109K  
                NDT Funds (Details)                                              
263: R146        Asset Retirement Obligations - Pledged Assets and   HTML    114K  
                Payables to ZionSolutions (Details)                              
264: R147        Asset Retirement Obligations - Non-Nuclear Asset    HTML    241K  
                Retirement Obligations Rollforward (Details)                     
265: R148        Retirement Benefits Retirement Benefits- Narrative  HTML    157K  
                (Details)                                                        
266: R149        Retirement Benefits Retirement Benefits - Summary   HTML    157K  
                of Changes in Benefit Obligations and Plan Assets                
                (Details)                                                        
267: R150        Retirement Benefits Retirement Benefits - Balance   HTML    111K  
                Sheet locations of Benefit Obligations and Plan                  
                Assets (Details)                                                 
268: R151        Retirement Benefits Reitrement Benefits- Projected  HTML    106K  
                Benefit Obligations and Accumulated Benefit                      
                Obligations in Excess of Plan Assets (Details)                   
269: R152        Retirement Benefits Retirement Benefits -           HTML    138K  
                Components of Net Periodic Benefit Cost (Details)                
270: R153        Retirement Benefits Retirement Benefits -           HTML    140K  
                Components of Accumulated Other Comprehensive                    
                Income and Regulatory Assets (Liabilities) related               
                to Retirement Plans (Details)                                    
271: R154        Retirement Benefits Retirement Benefits - Gross     HTML    112K  
                Accumulated Other Comprehensive Loss and                         
                Regulatory Assets (Liabilities) not Recognized as                
                Components of Periodic Benefit Cost (Details)                    
272: R155        Retirement Benefits Retirement Benefits -           HTML    175K  
                Assumptions Used in Calculations (Details)                       
273: R156        Retirement Benefits Retirement Benefits -           HTML    232K  
                Contributions made to Pension and Other                          
                Postretirement Benefit Plans (Details)                           
274: R157        Retirement Benefits Retirement Benefits -           HTML    116K  
                Estimated Future Benefit Payments (Details)                      
275: R158        Retirement Benefits Retirement Benefits -           HTML    135K  
                Allocated Portion of Pension and Postretirement                  
                Benefit Plan Costs (Details)                                     
276: R159        Retirement Benefits Retirement Benefits - Pension   HTML    118K  
                and Other Postretirement Benefit Plan Target Asset               
                Allocations (Details)                                            
277: R160        Retirement Benefits Retirement Benefits - Fair      HTML    326K  
                Value Measurements of Pension and Postretirement                 
                Benefit Plan Assets (Details)                                    
278: R161        Retirement Benefits Retirement Benefits -           HTML    157K  
                Reconciliation of Level 3 Assets and Liabilities                 
                measured at Fair Value for Pension and Other                     
                Postretirement Benefit Plans (Details)                           
279: R162        Retirement Benefits Retirement Benefits - Summary   HTML    137K  
                of Defined Contribution Savings Plan (Details)                   
280: R163        Severance Severance - PHI Merger (Details)          HTML    115K  
281: R164        Severance Severance - Liabilities Rollforward       HTML    139K  
                (Details)                                                        
282: R165        Shareholders' Equity Schedule of Common Stock       HTML    119K  
                Authorized and Outstanding (Details)                             
283: R166        Shareholders' Equity Shareholder Narrative          HTML    178K  
                (Details)                                                        
284: R167        Stock-Based Compensation Plans - Narrative          HTML    139K  
                (Details)                                                        
285: R168        Stock-Based Compensation Plans - Schedule of        HTML    125K  
                Stock-based Compensation Expense (Details)                       
286: R169        Stock-Based Compensation Plans - Schedule of        HTML    120K  
                Pre-Tax Stock-based Compensation Expense (Details)               
287: R170        Stock-Based Compensation Plans - Components of Tax  HTML    106K  
                Benefits from Stock-based Compensation (Details)                 
288: R171        Stock-Based Compensation Plans - Summary of Stock   HTML    133K  
                Option Activity (Details)                                        
289: R172        Stock-Based Compensation Plans - Summary of         HTML    100K  
                Information of Stock Options Exercised (Details)                 
290: R173        Stock-Based Compensation Plans - Summary of         HTML    127K  
                Nonvested Restricted Stock Unit Activity (Details)               
291: R174        Stock-Based Compensation Plans - Summary of         HTML    145K  
                Nonvested Performance Share Awards Activity                      
                (Details)                                                        
292: R175        Stock-Based Compensation Plans - Balance Sheet      HTML    104K  
                Classification of Obligations related to                         
                Outstanding Performance Share Awards Not Yet                     
                Settled (Details)                                                
293: R176        Earnings Per Share Earnings Per Share - Schedule    HTML    108K  
                of Earnings per Share (Details)                                  
294: R177        Earnings Per Share Earnings Per Share - Narrative   HTML    107K  
                (Details)                                                        
295: R178        Changes in Accumulated Other Comprehensive Income   HTML    228K  
                Changes in Accumulated Other Comprehensive Income                
                - Schedule of Changes in AOCI (Details)                          
296: R179        Changes in Accumulated Other Comprehensive Income   HTML    162K  
                Changes in Accumulated Other Comprehensive Income                
                - Reclassifications out of Accumulated Other                     
                Comprehensive Income (Details)                                   
297: R180        Changes in Accumulated Other Comprehensive Income   HTML    119K  
                - Components of Accumulated Other Comprehensive                  
                Income (Details)                                                 
298: R181        Commitments and Contingencies Commitments and       HTML    263K  
                Contingencies - Narrative (Details)                              
299: R182        Commitments and Contingencies Commitments and       HTML    231K  
                Contingencies - Schedule of Commercial Commitments               
                (Details)                                                        
300: R183        Commitments and Contingencies Commitments and       HTML    164K  
                Contingencies - Schedule of Minimum Future                       
                Operating Lease Payments (Details)                               
301: R184        Commitments and Contingencies Commitments and       HTML    124K  
                Contingencies - Schedule of Future Rental Expense                
                under Operating Leases (Details)                                 
302: R185        Commitments and Contingencies Commitments and       HTML    113K  
                Contingencies - Settlement Agreements (Details)                  
303: R186        Commitments and Contingencies Commitments and       HTML    127K  
                Contingencies - Schedule of Environmental                        
                Liabilities (Details)                                            
304: R187        Supplemental Financial Information Supplemental     HTML    152K  
                Financial Information - Summary of Taxes other                   
                than income (Details)                                            
305: R188        Supplemental Financial Information Supplemental     HTML    199K  
                Financial Information - Summary of Other Income                  
                (Expense) (Details)                                              
306: R189        Supplemental Financial Information Supplemental     HTML    531K  
                Financial Information - Supplemental Cash Flow                   
                Information (Details)                                            
307: R190        Supplemental Financial Information Supplemental     HTML    382K  
                Financial Information - Supplemental Balance Sheet               
                Information (Details)                                            
308: R191        Segment Information Segment Information -           HTML    100K  
                Narrative (Details)                                              
309: R192        Segment Information Segment Information -           HTML    580K  
                Reconciliation to Consolidated Financial                         
                Statements (Details)                                             
310: R193        Segment Information Segment Information -           HTML    244K  
                Generation Total Revenues (Details)                              
311: R194        Segment Information Segment Information -           HTML    156K  
                Generation Total Revenues Net of Purchased Power                 
                and Fuel Expense (Details)                                       
312: R195        Segment Information Segment Information - Electric  HTML    590K  
                and Gas Revenue by Customer Class (Details)                      
313: R196        Related Party Transactions - Related Party          HTML    335K  
                Transactions included in Consolidated Income                     
                Statement (Details)                                              
314: R197        Related Party Transactions - Related Party          HTML    259K  
                Transactions included in Consolidated Balance                    
                Sheet (Details)                                                  
315: R198        Quarterly Data (Unaudited) - Quarterly Operating    HTML    148K  
                Results (Details)                                                
316: R199        Quarterly Data (Unaudited) - Quarterly Per Share    HTML    105K  
                Information (Details)                                            
317: R200        Subsequent Events Subsequent Events - Narrative     HTML    105K  
                (Details)                                                        
318: R201        Schedule I - Condensed Financial Information of     HTML    185K  
                Parent (Exelon Corporate) - Condensed Statements                 
                of Operations and Other Comprehensive Income                     
                (Details)                                                        
319: R202        Schedule I - Condensed Financial Information of     HTML    145K  
                Parent (Exelon Corporate) - Condensed Statements                 
                of Cash Flows (Details)                                          
320: R203        Schedule I - Condensed Financial Information of     HTML    241K  
                Parent (Exelon Corporate) - Condensed Balance                    
                Sheet (Details)                                                  
321: R204        Schedule I - Condensed Financial Information of     HTML    104K  
                Parent (Exelon Corporate) - Condensed Balance                    
                Sheet - Parenthetical (Details)                                  
322: R205        Schedule I - Condensed Financial Information of     HTML    104K  
                Parent (Exelon Corporate) - Basis of Presentation                
                - Narrative (Details)                                            
323: R206        Schedule I - Condensed Financial Information of     HTML    110K  
                Parent (Exelon Corporate) - Debt and Credit                      
                Agreements - Narrative (Details)                                 
324: R207        Schedule I - Condensed Financial Information of     HTML    132K  
                Parent (Exelon Corporate) - Debt and Credit                      
                Agreements - Schedule of Outstanding Long-term                   
                Debt (Details)                                                   
325: R208        Schedule I - Condensed Financial Information of     HTML    119K  
                Parent (Exelon Corporate) - Debt and Credit                      
                Agreements - Schedule of Debt Maturities (Details)               
326: R209        Schedule I - Condensed Financial Information of     HTML    170K  
                Parent (Exelon Corporate) - Related Party                        
                Transactions - Summary of Related Party                          
                Transactions (Details)                                           
327: R210        Schedule II - Valuation and Qualifying Accounts     HTML    230K  
                Schedule II - Valuation and Qualifying Accounts                  
                (Details)                                                        
328: R9999       Uncategorized Items - exc-20181231.xml              HTML    170K  
330: XML         IDEA XML File -- Filing Summary                      XML    493K  
329: EXCEL       IDEA Workbook of Financial Reports                  XLSX    637K  
117: EX-101.INS  XBRL Instance -- exc-20181231                        XML  54.65M  
112: EX-101.CAL  XBRL Calculations -- exc-20181231_cal                XML    763K  
115: EX-101.DEF  XBRL Definitions -- exc-20181231_def                 XML   6.04M  
116: EX-101.LAB  XBRL Labels -- exc-20181231_lab                      XML   6.48M  
114: EX-101.PRE  XBRL Presentations -- exc-20181231_pre               XML   6.34M  
113: EX-101.SCH  XBRL Schema -- exc-20181231                          XSD    797K  
331: ZIP         XBRL Zipped Folder -- 0001628280-19-001107-xbrl      Zip   2.34M  

‘EX-101.CAL’   —   XBRL Calculations — exc-20181231_cal

This Exhibit is an XBRL XML File.