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Supplemental Financial Information - Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 300 $ 407 $ 446 $ 672
Restricted cash 435 566 744 321
Restricted cash included in other long-term assets 212 117 83 44
Cash, restricted cash, and cash equivalents - Held for Sale       582
Total cash, restricted cash, and cash equivalents 947 1,090 1,273 1,619
Accrued Expenses [Abstract]        
Compensation-related accruals 548 613    
Taxes accrued 255 211    
Interest accrued 391 338    
Commonwealth Edison Co        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 79 67 63 131
Restricted cash 360 327 342 210
Restricted cash included in other long-term assets 212 117 83 43
Cash, restricted cash, and cash equivalents - Held for Sale       0
Total cash, restricted cash, and cash equivalents 651 511 488 384
Accrued Expenses [Abstract]        
Compensation-related accruals 162 179    
Taxes accrued 148 92    
Interest accrued 78 124    
PECO Energy Co        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 43 59 94 36
Restricted cash 9 9 9 8
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 52 68 103 44
Accrued Expenses [Abstract]        
Compensation-related accruals 67 81    
Taxes accrued 61 10    
Interest accrued 52 47    
Baltimore Gas and Electric Company        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 15 43 20 51
Restricted cash 1 24 130 4
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 16 67 150 55
Accrued Expenses [Abstract]        
Compensation-related accruals 63 79    
Taxes accrued 100 34    
Interest accrued 59 42    
Pepco Holdings LLC        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 121 198 219 136
Restricted cash 25 175 234 77
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 146 373 453 213
Accrued Expenses [Abstract]        
Compensation-related accruals 99 104    
Taxes accrued 120 70    
Interest accrued 81 61    
Potomac Electric Power Company        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 31 45 21 34
Restricted cash 25 54 77 34
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 56 99 98 68
Accrued Expenses [Abstract]        
Compensation-related accruals 27 29    
Taxes accrued 88 52    
Interest accrued 38 32    
Delmarva Power and Light Company        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 5 31 49 28
Restricted cash 1 121 157 43
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 6 152 206 71
Accrued Expenses [Abstract]        
Compensation-related accruals 17 20    
Taxes accrued 19 8    
Interest accrued 24 9    
Atlantic City Electric Company        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 14 72 112 29
Restricted cash 0 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 14 72 $ 112 $ 29
Accrued Expenses [Abstract]        
Compensation-related accruals 14 16    
Taxes accrued 13 12    
Interest accrued $ 17 $ 14