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Supplemental Financial Information - Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 446 $ 672 $ 2,957 $ 432
Restricted cash 744 321 473 349
Restricted cash included in other long-term assets 83 44 54 53
Cash, restricted cash, and cash equivalents - Held for Sale   582   332
Total cash, restricted cash, and cash equivalents 1,273 1,619 3,484 1,166
Accrued Expenses [Abstract]        
Compensation-related accruals 501 596    
Taxes accrued 317 253    
Interest accrued 341 297    
Commonwealth Edison Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 63 131 241 83
Restricted cash 342 210 276 279
Restricted cash included in other long-term assets 83 43 44 43
Cash, restricted cash, and cash equivalents - Held for Sale   0   0
Total cash, restricted cash, and cash equivalents 488 384 561 405
Accrued Expenses [Abstract]        
Compensation-related accruals 152 155    
Taxes accrued 115 94    
Interest accrued 66 116    
PECO Energy Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 94 36 344 19
Restricted cash 9 8 8 7
Restricted cash included in other long-term assets 0 0 0 0
Cash, restricted cash, and cash equivalents - Held for Sale   0   0
Total cash, restricted cash, and cash equivalents 103 44 352 26
Accrued Expenses [Abstract]        
Compensation-related accruals 63 77    
Taxes accrued 41 14    
Interest accrued 43 41    
Baltimore Gas and Electric Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 20 51 225 144
Restricted cash 130 4 27 1
Restricted cash included in other long-term assets 0 0 0 0
Cash, restricted cash, and cash equivalents - Held for Sale   0   0
Total cash, restricted cash, and cash equivalents 150 55 252 145
Accrued Expenses [Abstract]        
Compensation-related accruals 56 78    
Taxes accrued 85 53    
Interest accrued 44 44    
Pepco Holdings LLC [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 219 136 82 111
Restricted cash 234 77 71 39
Restricted cash included in other long-term assets 0 0 9 10
Cash, restricted cash, and cash equivalents - Held for Sale   0   0
Total cash, restricted cash, and cash equivalents 453 213 162 160
Accrued Expenses [Abstract]        
Compensation-related accruals 89 113    
Taxes accrued 90 96    
Interest accrued 73 52    
Potomac Electric Power Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 21 34 19 30
Restricted cash 77 34 41 35
Restricted cash included in other long-term assets 0 0 0 0
Cash, restricted cash, and cash equivalents - Held for Sale   0   0
Total cash, restricted cash, and cash equivalents 98 68 60 65
Accrued Expenses [Abstract]        
Compensation-related accruals 26 35    
Taxes accrued 67 88    
Interest accrued 34 28    
Delmarva Power and Light Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 49 28 13 15
Restricted cash 157 43 26 0
Restricted cash included in other long-term assets 0 0 0 0
Cash, restricted cash, and cash equivalents - Held for Sale   0   0
Total cash, restricted cash, and cash equivalents 206 71 39 15
Accrued Expenses [Abstract]        
Compensation-related accruals 16 20    
Taxes accrued 12 9    
Interest accrued 21 8    
Book Overdrafts 28 4    
Atlantic City Electric Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 112 29 16 17
Restricted cash 0 0 5 3
Restricted cash included in other long-term assets 0 0 9 10
Cash, restricted cash, and cash equivalents - Held for Sale   0   0
Total cash, restricted cash, and cash equivalents 112 29 $ 30 $ 30
Accrued Expenses [Abstract]        
Compensation-related accruals 13 17    
Taxes accrued 4 11    
Interest accrued $ 16 $ 11