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Supplemental Financial Information - Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 2,476 $ 672 $ 1,908 $ 663
Restricted cash 430 321 374 438
Restricted cash included in other long-term assets 92 44 52 53
Cash, restricted cash, and cash equivalents - Held for Sale   582   12
Total cash, restricted cash, and cash equivalents 2,998 1,619 2,334 1,166
Accrued Expenses [Abstract]        
Compensation-related accruals 370 596    
Taxes accrued 258 253    
Interest accrued 346 297    
Commonwealth Edison Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 343 131 86 83
Restricted cash 246 210 270 279
Restricted cash included in other long-term assets 92 43 43 43
Cash, restricted cash, and cash equivalents - Held for Sale   0   0
Total cash, restricted cash, and cash equivalents 681 384 399 405
Accrued Expenses [Abstract]        
Compensation-related accruals 95 155    
Taxes accrued 95 94    
Interest accrued 66 116    
PECO Energy Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 26 36 48 19
Restricted cash 8 8 7 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 34 44 55 26
Accrued Expenses [Abstract]        
Compensation-related accruals 51 77    
Taxes accrued 15 14    
Interest accrued 36 41    
Baltimore Gas and Electric Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 41 51 21 144
Restricted cash 34 4 1 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 75 55 22 145
Accrued Expenses [Abstract]        
Compensation-related accruals 48 78    
Taxes accrued 78 53    
Interest accrued 39 44    
Pepco Holdings LLC [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 796 136 558 111
Restricted cash 106 77 37 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 902 213 604 160
Accrued Expenses [Abstract]        
Compensation-related accruals 73 113    
Taxes accrued 94 96    
Interest accrued 77 52    
Potomac Electric Power Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 502 34 134 30
Restricted cash 34 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 536 68 167 65
Accrued Expenses [Abstract]        
Compensation-related accruals 26 35    
Taxes accrued 85 88    
Interest accrued 37 28    
Delmarva Power and Light Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 120 28 64 15
Restricted cash 73 43 0 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 193 71 64 15
Accrued Expenses [Abstract]        
Compensation-related accruals 15 20    
Taxes accrued 10 9    
Interest accrued 21 8    
Atlantic City Electric Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 168 29 353 17
Restricted cash 0 0 4 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 168 29 $ 366 $ 30
Accrued Expenses [Abstract]        
Compensation-related accruals 12 17    
Taxes accrued 9 11    
Interest accrued $ 17 $ 11