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Supplemental Financial Information - Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 522 $ 407 $ 2,476 $ 672
Restricted cash 381 566 430 321
Restricted cash included in other long-term assets 180 117 92 44
Cash, restricted cash, and cash equivalents - Held for Sale       582
Total cash, restricted cash, and cash equivalents 1,083 1,090 2,998 1,619
Accrued Expenses [Abstract]        
Compensation-related accruals 359 613    
Taxes accrued 214 211    
Interest accrued 373 338    
Commonwealth Edison Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 75 67 343 131
Restricted cash 323 327 246 210
Restricted cash included in other long-term assets 180 117 92 43
Cash, restricted cash, and cash equivalents - Held for Sale       0
Total cash, restricted cash, and cash equivalents 578 511 681 384
Accrued Expenses [Abstract]        
Compensation-related accruals 107 179    
Taxes accrued 102 92    
Interest accrued 78 124    
PECO Energy Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 27 59 26 36
Restricted cash 9 9 8 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 36 68 34 44
Accrued Expenses [Abstract]        
Compensation-related accruals 43 81    
Taxes accrued 3 10    
Interest accrued 44 47    
Baltimore Gas and Electric Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 20 43 41 51
Restricted cash 1 24 34 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 21 67 75 55
Accrued Expenses [Abstract]        
Compensation-related accruals 42 79    
Taxes accrued 83 34    
Interest accrued 45 42    
Pepco Holdings LLC [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 367 198 796 136
Restricted cash 29 175 106 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 396 373 902 213
Accrued Expenses [Abstract]        
Compensation-related accruals 59 104    
Taxes accrued 94 70    
Interest accrued 75 61    
Potomac Electric Power Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 126 45 502 34
Restricted cash 27 54 34 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 153 99 536 68
Accrued Expenses [Abstract]        
Compensation-related accruals 18 29    
Taxes accrued 67 52    
Interest accrued 35 32    
Delmarva Power and Light Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 142 31 120 28
Restricted cash 1 121 73 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 143 152 193 71
Accrued Expenses [Abstract]        
Compensation-related accruals 11 20    
Taxes accrued 14 8    
Interest accrued 22 9    
Atlantic City Electric Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 71 72 168 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 71 72 $ 168 $ 29
Accrued Expenses [Abstract]        
Compensation-related accruals 10 16    
Taxes accrued 16 12    
Interest accrued $ 16 $ 14