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Supplemental Financial Information - Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 399 $ 407 $ 816 $ 672
Restricted cash 435 566 961 321
Restricted cash included in other long-term assets 201 117 59 44
Cash, restricted cash, and cash equivalents - Held for Sale       582
Total cash, restricted cash, and cash equivalents 1,035 1,090 1,836 1,619
Accrued Expenses [Abstract]        
Compensation-related accruals 467 613    
Taxes accrued 179 211    
Interest accrued 423 338    
Commonwealth Edison Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 74 67 120 131
Restricted cash 361 327 384 210
Restricted cash included in other long-term assets 201 117 59 43
Cash, restricted cash, and cash equivalents - Held for Sale       0
Total cash, restricted cash, and cash equivalents 636 511 563 384
Accrued Expenses [Abstract]        
Compensation-related accruals 121 179    
Taxes accrued 101 92    
Interest accrued 151 124    
PECO Energy Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 82 59 23 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 91 68 32 44
Accrued Expenses [Abstract]        
Compensation-related accruals 65 81    
Taxes accrued 40 10    
Interest accrued 48 47    
Baltimore Gas and Electric Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 89 43 354 51
Restricted cash 1 24 205 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 90 67 559 55
Accrued Expenses [Abstract]        
Compensation-related accruals 59 79    
Taxes accrued 33 34    
Interest accrued 43 42    
Pepco Holdings LLC [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 110 198 278 136
Restricted cash 26 175 341 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 136 373 619 213
Accrued Expenses [Abstract]        
Compensation-related accruals 88 104    
Taxes accrued 75 70    
Interest accrued 69 61    
Potomac Electric Power Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 16 45 14 34
Restricted cash 26 54 117 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 42 99 131 68
Accrued Expenses [Abstract]        
Compensation-related accruals 26 29    
Taxes accrued 52 52    
Interest accrued 37 32    
Delmarva Power and Light Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 18 31 26 28
Restricted cash 0 121 223 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 18 152 249 71
Accrued Expenses [Abstract]        
Compensation-related accruals 17 20    
Taxes accrued 13 8    
Interest accrued 12 9    
Atlantic City Electric Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 24 72 233 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 24 72 $ 233 $ 29
Accrued Expenses [Abstract]        
Compensation-related accruals 14 16    
Taxes accrued 8 12    
Interest accrued $ 15 $ 14