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Segment Information - Reconciliation to Consolidated Financial Statements (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Revenues $ 8,747 $ 9,477  
Revenue from Related Parties 1 0  
Depreciation and Amortization 1,021 1,075  
Operating Expenses 7,529 8,262  
Interest expense, net 410 403  
Income (Loss) before income taxes 85 1,282  
Income taxes (294) 310  
Net income (loss) 376 966  
Capital expenditures 2,016 1,873  
Assets [1] 124,677   $ 124,977
Exelon Generation Co L L C [Member]      
Segment Reporting Information [Line Items]      
Revenues 4,733 5,296  
Revenue from Related Parties 330 317  
Income (Loss) before income taxes (547) 652  
Income taxes (389) 224  
Net income (loss) (161) 422  
Capital expenditures 558 511  
Assets [2] 47,882   48,995
Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,171 1,228  
Revenue from Related Parties 3 3  
Income (Loss) before income taxes 119 122  
Income taxes 11 5  
Net income (loss) 108 117  
Capital expenditures 376 358  
Assets [3] 22,753   22,719
PECO Energy Co Affiliate [Member] | Exelon Generation Co L L C [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 37 45  
Baltimore Gas And Electric Company Affiliate [Member] | Exelon Generation Co L L C [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 99 76  
Commonwealth Edison Co Affiliate [Member] | Exelon Generation Co L L C [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 90 94  
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Competitive businesses other revenues 308 79  
Revenues 8,747 9,477  
Net income (loss) 376 966  
Assets 124,677   124,977
Operating Segments [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 18 15  
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Competitive businesses other revenues (1) (1)  
Revenues (826) (786)  
Revenue from Related Parties (824) (785)  
Depreciation and Amortization 0 0  
Operating Expenses (816) (783)  
Interest expense, net 0 0  
Income (Loss) before income taxes 1 0  
Income taxes 0 0  
Net income (loss) 1 0  
Capital expenditures 0 0  
Assets (9,765)   (10,089)
Intersegment Eliminations [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenues (92) (106)  
Revenue from Related Parties (93) (106)  
Depreciation and Amortization (1) (1)  
Operating Expenses (90) (105)  
Interest expense, net (1) (1)  
Income (Loss) before income taxes (110) (118)  
Income taxes 0 0  
Net income (loss) 3 4  
Capital expenditures 0 0  
Assets (6,152)   (5,810)
Exelon Generation Co L L C [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Competitive businesses other revenues 309 80  
Revenues 4,733 5,296  
Depreciation and Amortization 304 405  
Operating Expenses 4,400 4,963  
Interest expense, net 109 111  
Income (Loss) before income taxes (547) 652  
Income taxes (389) 224  
Net income (loss) (161) 422  
Capital expenditures 558 511  
Assets 47,882   48,995
Exelon Generation Co L L C [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 330 317  
Commonwealth Edison Co [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Competitive businesses other revenues 0 0  
Revenues 1,439 1,408  
Depreciation and Amortization 273 251  
Operating Expenses 1,151 1,135  
Interest expense, net 94 87  
Income (Loss) before income taxes 204 197  
Income taxes 36 40  
Net income (loss) 168 157  
Capital expenditures 506 503  
Assets 33,146   32,765
Commonwealth Edison Co [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 5 4  
PECO Energy Co [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Competitive businesses other revenues 0 0  
Revenues 813 900  
Depreciation and Amortization 86 81  
Operating Expenses 625 678  
Interest expense, net 36 33  
Income (Loss) before income taxes 155 193  
Income taxes 15 25  
Net income (loss) 140 168  
Capital expenditures 259 222  
Assets 11,535   11,469
PECO Energy Co [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 2 1  
Baltimore Gas and Electric Company [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Competitive businesses other revenues 0 0  
Revenues 937 976  
Depreciation and Amortization 143 136  
Operating Expenses 688 756  
Interest expense, net 32 29  
Income (Loss) before income taxes 222 196  
Income taxes 41 36  
Net income (loss) 181 160  
Capital expenditures 283 258  
Assets 10,789   10,634
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 Segments [Member]      
Segment Reporting Information [Line Items]      
Competitive businesses other revenues 0 0  
Revenues 1,171 1,228  
Depreciation and Amortization 194 180  
Operating Expenses 1,000 1,054  
Interest expense, net 67 65  
Income (Loss) before income taxes 119 122  
Income taxes 11 5  
Net income (loss) 108 117  
Capital expenditures 376 358  
Assets 22,753   22,719
Pepco Holdings LLC [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 3 4  
Potomac Electric Power Company [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 544 575  
Depreciation and Amortization 95 94  
Operating Expenses 462 491  
Interest expense, net 34 34  
Income (Loss) before income taxes 57 57  
Income taxes 5 2  
Net income (loss) 52 55  
Capital expenditures 180 144  
Assets 8,837   8,661
Potomac Electric Power Company [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 1 2  
Delmarva Power and Light Company [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 350 380  
Depreciation and Amortization 48 46  
Operating Expenses 284 308  
Interest expense, net 16 15  
Income (Loss) before income taxes 52 60  
Income taxes 7 7  
Net income (loss) 45 53  
Capital expenditures 95 78  
Assets 4,849   4,830
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 Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 276 273  
Depreciation and Amortization 43 31  
Operating Expenses 251 252  
Interest expense, net 15 14  
Income (Loss) before income taxes 14 10  
Income taxes 1 0  
Net income (loss) 13 10  
Capital expenditures 101 128  
Assets 3,978   3,933
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]      
Competitive businesses other revenues 0 0  
Revenues 480 455  
Depreciation and Amortization 21 22  
Operating Expenses 481 459  
Interest expense, net 72 78  
Income (Loss) before income taxes (69) (78)  
Income taxes (8) (20)  
Net income (loss) (61) (58)  
Capital expenditures 34 21  
Assets 8,337   8,484
Corporate and Other [Member] | Corporate, Non-Segment [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenues 93 106  
Depreciation and Amortization 9 10  
Operating Expenses 93 108  
Interest expense, net 3 3  
Income (Loss) before income taxes 106 113  
Income taxes (2) (4)  
Net income (loss) (5) (5)  
Capital expenditures 0 8  
Assets 11,241   $ 11,105
Corporate and Other [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 479 453  
Corporate and Other [Member] | Intersegment Eliminations [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 92 105  
Generation Mid Atlantic [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,174 1,256  
Generation Mid Atlantic [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,168 1,262  
Generation Mid Atlantic [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties 6 (6)  
Generation Midwest [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,002 1,108  
Generation Midwest [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,008 1,114  
Generation Midwest [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Related Parties (6) (6)  
Electricity, Generation [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 3,426 4,022  
Electricity, Generation [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax (326) (315)  
Electricity, Generation [Member] | Exelon Generation Co L L C [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 3,752 4,337  
Electricity, Generation [Member] | Commonwealth Edison Co [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Electricity, Generation [Member] | PECO Energy Co [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Electricity, Generation [Member] | Baltimore Gas and Electric Company [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Electricity, Generation [Member] | Pepco Holdings LLC [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Electricity, Generation [Member] | Corporate and Other [Member] | Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Oil and Gas, Purchased [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 669 878  
Oil and Gas, Purchased [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax (3) (1)  
Oil and Gas, Purchased [Member] | Exelon Generation Co L L C [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 672 879  
Oil and Gas, Purchased [Member] | Commonwealth Edison Co [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Oil and Gas, Purchased [Member] | PECO Energy Co [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Oil and Gas, Purchased [Member] | Baltimore Gas and Electric Company [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Oil and Gas, Purchased [Member] | Pepco Holdings LLC [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Oil and Gas, Purchased [Member] | Corporate and Other [Member] | Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Electricity, US Regulated | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 1,086 1,139  
Electricity, US Regulated | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 3,748 3,831  
Electricity, US Regulated | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax (12) (8)  
Electricity, US Regulated | Intersegment Eliminations [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax (2) (5)  
Electricity, US Regulated | Exelon Generation Co L L C [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Electricity, US Regulated | Commonwealth Edison Co [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 1,439 1,408  
Electricity, US Regulated | PECO Energy Co [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 604 620  
Electricity, US Regulated | Baltimore Gas and Electric Company [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 613 658  
Electricity, US Regulated | Pepco Holdings LLC [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 1,104 1,153  
Electricity, US Regulated | Potomac Electric Power Company [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 544 575  
Electricity, US Regulated | Delmarva Power and Light Company [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 286 310  
Electricity, US Regulated | Atlantic City Electric Company [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 276 273  
Electricity, US Regulated | Corporate and Other [Member] | Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Electricity, US Regulated | 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  
Natural Gas, US Regulated | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 64 71  
Natural Gas, US Regulated | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 595 665  
Natural Gas, US Regulated | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax (2) (4)  
Natural Gas, US Regulated | Intersegment Eliminations [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 1  
Natural Gas, US Regulated | Exelon Generation Co L L C [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Natural Gas, US Regulated | Commonwealth Edison Co [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Natural Gas, US Regulated | PECO Energy Co [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 209 280  
Natural Gas, US Regulated | Baltimore Gas and Electric Company [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 324 318  
Natural Gas, US Regulated | Pepco Holdings LLC [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 64 71  
Natural Gas, US Regulated | Potomac Electric Power Company [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Natural Gas, US Regulated | Delmarva Power and Light Company [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 64 70  
Natural Gas, US Regulated | Atlantic City Electric Company [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Natural Gas, US Regulated | Corporate and Other [Member] | Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Natural Gas, US Regulated | 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  
Service, Other [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 1 2  
Service, Other [Member] | Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax (482) (457)  
Service, Other [Member] | Intersegment Eliminations [Member] | Pepco Holdings LLC [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax (90) (102)  
Service, Other [Member] | Exelon Generation Co L L C [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Service, Other [Member] | Commonwealth Edison Co [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Service, Other [Member] | PECO Energy Co [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Service, Other [Member] | Baltimore Gas and Electric Company [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Service, Other [Member] | Pepco Holdings LLC [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 3 4  
Service, Other [Member] | Potomac Electric Power Company [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Service, Other [Member] | Delmarva Power and Light Company [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Service, Other [Member] | Atlantic City Electric Company [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 0 0  
Service, Other [Member] | Corporate and Other [Member] | Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue from Contract with Customer, Including Assessed Tax 480 455  
Service, Other [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 $ 93 $ 106  
[1]
Exelon’s consolidated assets include $9,056 million and $9,532 million at March 31, 2020 and December 31, 2019, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Exelon’s consolidated liabilities include $3,412 million and $3,473 million at March 31, 2020 and December 31, 2019, 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 $9,034 million and $9,512 million at March 31, 2020 and December 31, 2019, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Generation’s consolidated liabilities include $3,369 million and $3,429 million at March 31, 2020 and December 31, 2019, 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 $22 million and $20 million at March 31, 2020 and December 31, 2019, respectively, of PHI's consolidated VIE that can only be used to settle the liabilities of the VIE. PHI’s consolidated total liabilities include $43 million and $44 million at March 31, 2020 and December 31, 2019, 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.