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Supplemental Financial Information - Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 816 $ 672 $ 1,578 $ 432
Restricted cash 961 321 379 349
Restricted cash included in other long-term assets 59 44 52 53
Cash, restricted cash, and cash equivalents - Held for Sale   582   332
Total cash, restricted cash, and cash equivalents 1,836 1,619 2,009 1,166
Accrued Expenses [Abstract]        
Compensation-related accruals 428 596    
Taxes accrued 243 253    
Interest accrued 331 297    
Commonwealth Edison Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 120 131 71 83
Restricted cash 384 210 240 279
Restricted cash included in other long-term assets 59 43 43 43
Cash, restricted cash, and cash equivalents - Held for Sale   0   0
Total cash, restricted cash, and cash equivalents 563 384 354 405
Accrued Expenses [Abstract]        
Compensation-related accruals 109 155    
Taxes accrued 94 94    
Interest accrued 124 116    
PECO Energy Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 23 36 376 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 32 44 384 26
Accrued Expenses [Abstract]        
Compensation-related accruals 57 77    
Taxes accrued 60 14    
Interest accrued 40 41    
Baltimore Gas and Electric Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 354 51 368 144
Restricted cash 205 4 3 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 559 55 371 145
Accrued Expenses [Abstract]        
Compensation-related accruals 54 78    
Taxes accrued 31 53    
Interest accrued 44 44    
Pepco Holdings LLC [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 278 136 61 111
Restricted cash 341 77 42 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 619 213 112 160
Accrued Expenses [Abstract]        
Compensation-related accruals 82 113    
Taxes accrued 84 96    
Interest accrued 59 52    
Potomac Electric Power Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 14 34 17 30
Restricted cash 117 34 33 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 131 68 50 65
Accrued Expenses [Abstract]        
Compensation-related accruals 26 35    
Taxes accrued 57 88    
Interest accrued 31 28    
Delmarva Power and Light Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 26 28 17 15
Restricted cash 223 43 5 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 249 71 22 15
Accrued Expenses [Abstract]        
Compensation-related accruals 16 20    
Taxes accrued 12 9    
Interest accrued 9 8    
Atlantic City Electric Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 233 29 11 17
Restricted cash 0 0 3 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 233 29 $ 23 $ 30
Accrued Expenses [Abstract]        
Compensation-related accruals 13 17    
Taxes accrued 11 11    
Interest accrued $ 14 $ 11