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Supplemental Financial Information - Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 1,578 $ 663 $ 2,129 $ 587
Restricted cash 379 438 373 358
Restricted cash included in other long-term assets 52 53 178 177
Cash, restricted cash, and cash equivalents - Held for Sale   12    
Total cash, restricted cash, and cash equivalents 2,009 1,166 2,680 1,122
Accrued Expenses [Abstract]        
Compensation-related accruals 730 1,069    
Taxes accrued 473 527    
Interest accrued 339 331    
Exelon Generation Co L L C [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 542 226 483 303
Restricted cash 59 89 153 146
Restricted cash included in other long-term assets 0 0 0 0
Cash, restricted cash, and cash equivalents - Held for Sale   12    
Total cash, restricted cash, and cash equivalents 601 327 636 449
Accrued Expenses [Abstract]        
Compensation-related accruals 255 426    
Taxes accrued 242 229    
Interest accrued 43 44    
Commonwealth Edison Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 71 83 403 90
Restricted cash 240 279 155 150
Restricted cash included in other long-term assets 43 43 166 163
Cash, restricted cash, and cash equivalents - Held for Sale   0    
Total cash, restricted cash, and cash equivalents 354 405 724 403
Accrued Expenses [Abstract]        
Compensation-related accruals 136 170    
Taxes accrued 77 94    
Interest accrued 116 109    
PECO Energy Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 376 19 380 21
Restricted cash 8 7 7 6
Restricted cash included in other long-term assets 0 0 0 0
Cash, restricted cash, and cash equivalents - Held for Sale   0    
Total cash, restricted cash, and cash equivalents 384 26 387 27
Accrued Expenses [Abstract]        
Compensation-related accruals 51 73    
Taxes accrued 31 16    
Interest accrued 40 37    
Baltimore Gas and Electric Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 368 144 195 24
Restricted cash 3 1 1 1
Restricted cash included in other long-term assets 0 0 0 0
Cash, restricted cash, and cash equivalents - Held for Sale   0    
Total cash, restricted cash, and cash equivalents 371 145 196 25
Accrued Expenses [Abstract]        
Compensation-related accruals 55 84    
Taxes accrued 35 73    
Interest accrued 45 46    
Pepco Holdings LLC [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 61 111 39 131
Restricted cash 42 39 36 36
Restricted cash included in other long-term assets 9 10 11 14
Cash, restricted cash, and cash equivalents - Held for Sale   0    
Total cash, restricted cash, and cash equivalents 112 160 86 181
Accrued Expenses [Abstract]        
Compensation-related accruals 85 109    
Taxes accrued 86 117    
Interest accrued 51 51    
Potomac Electric Power Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 17 30 19 30
Restricted cash 33 35 33 33
Restricted cash included in other long-term assets 0 0 0 0
Cash, restricted cash, and cash equivalents - Held for Sale   0    
Total cash, restricted cash, and cash equivalents 50 65 52 63
Accrued Expenses [Abstract]        
Compensation-related accruals 28 36    
Taxes accrued 58 90    
Interest accrued 27 26    
Delmarva Power and Light Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 17 15 6 13
Restricted cash 5 0 0 0
Restricted cash included in other long-term assets 0 0 0 0
Cash, restricted cash, and cash equivalents - Held for Sale   0    
Total cash, restricted cash, and cash equivalents 22 15 6 13
Accrued Expenses [Abstract]        
Compensation-related accruals 16 18    
Taxes accrued 9 18    
Interest accrued 8 7    
Atlantic City Electric Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 11 17 8 12
Restricted cash 3 3 3 2
Restricted cash included in other long-term assets 9 10 11 14
Cash, restricted cash, and cash equivalents - Held for Sale   0    
Total cash, restricted cash, and cash equivalents 23 30 $ 22 $ 28
Accrued Expenses [Abstract]        
Compensation-related accruals 13 17    
Taxes accrued 9 12    
Interest accrued $ 12 $ 12