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Segment Information - Reconciliation to Consolidated Financial Statements (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Revenues $ 9,890 $ 8,747  
Revenue from Related Parties 0 1  
Depreciation and Amortization 1,697 1,021  
Operating Expenses 10,082 7,529  
Interest expense, net 386 410  
Income (Loss) before income taxes (282) 85  
Income taxes (19) (294)  
Net income (loss) (264) 376  
Capital expenditures 2,140 2,016  
Assets [1] 130,000   $ 129,317
Exelon Generation Co L L C [Member]      
Segment Reporting Information [Line Items]      
Revenues 5,559 4,733  
Revenue from Related Parties 295 330  
Income (Loss) before income taxes (947) (547)  
Income taxes (179) (389)  
Net income (loss) (769) (161)  
Capital expenditures 382 558  
Assets [2] 47,326   48,094
Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,244 1,171  
Revenue from Related Parties 3 3  
Income (Loss) before income taxes 136 119  
Income taxes 8 11  
Net income (loss) 128 108  
Capital expenditures 456 376  
Assets [3] 24,387   23,736
Commonwealth Edison Co Affiliate [Member] | Exelon Generation Co L L C [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 78 90  
PECO Energy Co Affiliate [Member] | Exelon Generation Co L L C [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 42 37  
Baltimore Gas And Electric Company Affiliate [Member] | Exelon Generation Co L L C [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 72 99  
Operating Segment [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 46 18  
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenues (802) (826)  
Revenue from Related Parties (799) (824)  
Depreciation and Amortization 0 0  
Operating Expenses (781) (816)  
Interest expense, net 0 0  
Income (Loss) before income taxes 0 1  
Income taxes 0 0  
Net income (loss) 0 1  
Capital expenditures 0 0  
Assets (10,022)   (10,165)
Intersegment Eliminations [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenues (96) (92)  
Revenue from Related Parties (96) (93)  
Depreciation and Amortization 0 (1)  
Operating Expenses (96) (90)  
Interest expense, net 0 (1)  
Income (Loss) before income taxes 0 0  
Income taxes 0 0  
Net income (loss) 0 0  
Capital expenditures 0 0  
Assets (37)   (33)
Exelon Generation Co L L C [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenues 5,559 4,733  
Depreciation and Amortization 940 304  
Operating Expenses 6,672 4,400  
Interest expense, net 72 109  
Income (Loss) before income taxes (947) (547)  
Income taxes (179) (389)  
Net income (loss) (769) (161)  
Capital expenditures 382 558  
Assets 47,326   48,094
Exelon Generation Co L L C [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 295 330  
Commonwealth Edison Co [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,535 1,439  
Depreciation and Amortization 292 273  
Operating Expenses 1,210 1,151  
Interest expense, net 96 94  
Income (Loss) before income taxes 236 204  
Income taxes 39 36  
Net income (loss) 197 168  
Capital expenditures 613 506  
Assets 34,825   34,466
Commonwealth Edison Co [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 6 5  
PECO Energy Co [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenues 889 813  
Depreciation and Amortization 86 86  
Operating Expenses 679 625  
Interest expense, net 38 36  
Income (Loss) before income taxes 177 155  
Income taxes 10 15  
Net income (loss) 167 140  
Capital expenditures 295 259  
Assets 12,937   12,531
PECO Energy Co [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 2 2  
Baltimore Gas and Electric Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenues 974 937  
Depreciation and Amortization 152 143  
Operating Expenses 752 688  
Interest expense, net 34 32  
Income (Loss) before income taxes 196 222  
Income taxes (13) 41  
Net income (loss) 209 181  
Capital expenditures 336 283  
Assets 11,759   11,650
Baltimore Gas and Electric Company [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 6 6  
Pepco Holdings LLC [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,244 1,171  
Depreciation and Amortization 210 194  
Operating Expenses 1,058 1,000  
Interest expense, net 67 67  
Income (Loss) before income taxes 136 119  
Income taxes 8 11  
Net income (loss) 128 108  
Capital expenditures 456 376  
Assets 24,387   23,736
Pepco Holdings LLC [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 3 3  
Potomac Electric Power Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenues 553 544  
Depreciation and Amortization 102 95  
Operating Expenses 466 462  
Interest expense, net 34 34  
Income (Loss) before income taxes 65 57  
Income taxes 6 5  
Net income (loss) 59 52  
Capital expenditures 220 180  
Assets 9,493   9,264
Potomac Electric Power Company [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 1 1  
Delmarva Power and Light Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenues 382 350  
Depreciation and Amortization 53 48  
Operating Expenses 309 284  
Interest expense, net 15 16  
Income (Loss) before income taxes 61 52  
Income taxes 5 7  
Net income (loss) 56 45  
Capital expenditures 112 95  
Assets 5,232   5,140
Delmarva Power and Light Company [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 2 2  
Atlantic City Electric Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenues 310 276  
Depreciation and Amortization 47 43  
Operating Expenses 282 251  
Interest expense, net 15 15  
Income (Loss) before income taxes 14 14  
Income taxes 0 1  
Net income (loss) 14 13  
Capital expenditures 123 101  
Assets 4,679   4,286
Atlantic City Electric Company [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 1 1  
Corporate and Other [Member] | Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Revenues 491 480  
Depreciation and Amortization 17 21  
Operating Expenses 492 481  
Interest expense, net 79 72  
Income (Loss) before income taxes (80) (69)  
Income taxes 116 (8)  
Net income (loss) (196) (61)  
Capital expenditures 58 34  
Assets 8,788   9,005
Corporate and Other [Member] | Corporate, Non-Segment [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenues 95 93  
Depreciation and Amortization 8 9  
Operating Expenses 97 93  
Interest expense, net 3 3  
Income (Loss) before income taxes (4) (4)  
Income taxes (3) (2)  
Net income (loss) (1) (2)  
Capital expenditures 1 0  
Assets 5,020   $ 5,079
Corporate and Other [Member] | Corporate, Non-Segment [Member] | Pepco Holdings LLC [Member] | Revision of Prior Period, Adjustment [Member]      
Segment Reporting Information [Line Items]      
Income (Loss) before income taxes   110  
Corporate and Other [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 487 479  
Corporate and Other [Member] | Intersegment Eliminations [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 95 92  
Competitive businesses electric revenues [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 3,894 3,426  
Competitive businesses electric revenues [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax (293) (326)  
Competitive businesses electric revenues [Member] | Exelon Generation Co L L C [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 4,187 3,752  
Competitive businesses electric revenues [Member] | Commonwealth Edison Co [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Competitive businesses electric revenues [Member] | PECO Energy Co [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Competitive businesses electric revenues [Member] | Baltimore Gas and Electric Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Competitive businesses electric revenues [Member] | Pepco Holdings LLC [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Competitive businesses electric revenues [Member] | Corporate and Other [Member] | Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Competitive businesses natural gas revenues Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 1,326 669  
Competitive businesses natural gas revenues Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax (3)  
Competitive businesses natural gas revenues Member] | Exelon Generation Co L L C [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 1,326 672  
Competitive businesses natural gas revenues Member] | Commonwealth Edison Co [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Competitive businesses natural gas revenues Member] | PECO Energy Co [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Competitive businesses natural gas revenues Member] | Baltimore Gas and Electric Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Competitive businesses natural gas revenues Member] | Pepco Holdings LLC [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Competitive businesses natural gas revenues Member] | Corporate and Other [Member] | Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Competitive businesses other revenues [Member]      
Segment Reporting Information [Line Items]      
Competitive businesses other revenues 45 308  
Competitive businesses other revenues [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Competitive businesses other revenues (1) (1)  
Competitive businesses other revenues [Member] | Exelon Generation Co L L C [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Competitive businesses other revenues 46 309  
Competitive businesses other revenues [Member] | Commonwealth Edison Co [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Competitive businesses other revenues 0 0  
Competitive businesses other revenues [Member] | PECO Energy Co [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Competitive businesses other revenues 0 0  
Competitive businesses other revenues [Member] | Baltimore Gas and Electric Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Competitive businesses other revenues 0 0  
Competitive businesses other revenues [Member] | Pepco Holdings LLC [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Competitive businesses other revenues 0 0  
Competitive businesses other revenues [Member] | Corporate and Other [Member] | Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Competitive businesses other revenues 0 0  
Rate-regulated electric revenues [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 3,988 3,748  
Rate-regulated electric revenues [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 1,124 1,086  
Rate-regulated electric revenues [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax (10) (12)  
Rate-regulated electric revenues [Member] | Intersegment Eliminations [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax (4) (2)  
Rate-regulated electric revenues [Member] | Exelon Generation Co L L C [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Rate-regulated electric revenues [Member] | Commonwealth Edison Co [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 1,535 1,439  
Rate-regulated electric revenues [Member] | PECO Energy Co [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 661 604  
Rate-regulated electric revenues [Member] | Baltimore Gas and Electric Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 632 613  
Rate-regulated electric revenues [Member] | Pepco Holdings LLC [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 1,170 1,104  
Rate-regulated electric revenues [Member] | Potomac Electric Power Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 553 544  
Rate-regulated electric revenues [Member] | Delmarva Power and Light Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 311 286  
Rate-regulated electric revenues [Member] | Atlantic City Electric Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 310 276  
Rate-regulated electric revenues [Member] | Corporate and Other [Member] | Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Rate-regulated electric revenues [Member] | Corporate and Other [Member] | Corporate, Non-Segment [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Rate-regulated natural gas revenues [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 637 595  
Rate-regulated natural gas revenues [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 71 64  
Rate-regulated natural gas revenues [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax (4) (2)  
Rate-regulated natural gas revenues [Member] | Intersegment Eliminations [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Rate-regulated natural gas revenues [Member] | Exelon Generation Co L L C [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Rate-regulated natural gas revenues [Member] | Commonwealth Edison Co [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Rate-regulated natural gas revenues [Member] | PECO Energy Co [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 228 209  
Rate-regulated natural gas revenues [Member] | Baltimore Gas and Electric Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 342 324  
Rate-regulated natural gas revenues [Member] | Pepco Holdings LLC [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 71 64  
Rate-regulated natural gas revenues [Member] | Potomac Electric Power Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Rate-regulated natural gas revenues [Member] | Delmarva Power and Light Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 71 64  
Rate-regulated natural gas revenues [Member] | Atlantic City Electric Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Rate-regulated natural gas revenues [Member] | Corporate and Other [Member] | Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Rate-regulated natural gas revenues [Member] | Corporate and Other [Member] | Corporate, Non-Segment [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Shared service and other revenues [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 1  
Shared service and other revenues [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax (494) (482)  
Shared service and other revenues [Member] | Intersegment Eliminations [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax (92) (90)  
Shared service and other revenues [Member] | Exelon Generation Co L L C [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Shared service and other revenues [Member] | Commonwealth Edison Co [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Shared service and other revenues [Member] | PECO Energy Co [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Shared service and other revenues [Member] | Baltimore Gas and Electric Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Shared service and other revenues [Member] | Pepco Holdings LLC [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 3 3  
Shared service and other revenues [Member] | Potomac Electric Power Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Shared service and other revenues [Member] | Delmarva Power and Light Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Shared service and other revenues [Member] | Atlantic City Electric Company [Member] | Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Shared service and other revenues [Member] | Corporate and Other [Member] | Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 491 480  
Shared service and other revenues [Member] | Corporate and Other [Member] | Corporate, Non-Segment [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax $ 95 $ 93  
[1] Exelon’s consolidated assets include $9,985 million and $10,200 million at March 31, 2021 and December 31, 2020, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Exelon’s consolidated liabilities include $3,578 million and $3,598 million at March 31, 2021 and December 31, 2020, respectively, of certain VIEs for which the VIE creditors do not have recourse to Exelon. See Note 16 — Variable Interest Entities for additional information.
[2] Generation’s consolidated assets include $9,967 million and $10,182 million at March 31, 2021 and December 31, 2020, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Generation’s consolidated liabilities include $3,557 million and $3,572 million at March 31, 2021 and December 31, 2020, respectively, of certain VIEs for which the VIE creditors do not have recourse to Generation. See Note 16 — Variable Interest Entities for additional information.
[3] PHI’s consolidated total assets include $18 million at both March 31, 2021 and December 31, 2020 of PHI's consolidated VIE that can only be used to settle the liabilities of the VIE. PHI’s consolidated total liabilities include $21 million and $26 million at March 31, 2021 and December 31, 2020, respectively, of PHI's consolidated VIE for which the VIE creditors do not have recourse to PHI. See Note 16 — Variable Interest Entities for additional information.