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Supplemental Financial Information - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Investments [Abstract]    
Equity investments without readily determinable fair values   $ 5
Total Investments $ 250 238
Accrued Expenses [Abstract]    
Compensation-related accruals 596 594
Taxes accrued 253 291
Interest accrued 297 289
Other Equity Method Investments    
Investments [Abstract]    
Equity Method Investments 15 15
Employee benefit trusts and investments    
Investments [Abstract]    
Employee benefit trusts and investments 235 218
Commonwealth Edison Co [Member]    
Investments [Abstract]    
Equity investments without readily determinable fair values   0
Total Investments 6 6
Accrued Expenses [Abstract]    
Compensation-related accruals 155 170
Taxes accrued 94 94
Interest accrued 116 109
Commonwealth Edison Co [Member] | Other Equity Method Investments    
Investments [Abstract]    
Equity Method Investments 6 6
Commonwealth Edison Co [Member] | Employee benefit trusts and investments    
Investments [Abstract]    
Employee benefit trusts and investments 0 0
PECO Energy Co [Member]    
Investments [Abstract]    
Equity investments without readily determinable fair values   0
Total Investments 34 30
Accrued Expenses [Abstract]    
Compensation-related accruals 77 73
Taxes accrued 14 16
Interest accrued 41 37
PECO Energy Co [Member] | Other Equity Method Investments    
Investments [Abstract]    
Equity Method Investments 7 8
PECO Energy Co [Member] | Employee benefit trusts and investments    
Investments [Abstract]    
Employee benefit trusts and investments 27 22
Baltimore Gas and Electric Company [Member]    
Investments [Abstract]    
Equity investments without readily determinable fair values   0
Total Investments 14 10
Accrued Expenses [Abstract]    
Compensation-related accruals 78 84
Taxes accrued 53 73
Interest accrued 44 46
Baltimore Gas and Electric Company [Member] | Other Equity Method Investments    
Investments [Abstract]    
Equity Method Investments 0 0
Baltimore Gas and Electric Company [Member] | Employee benefit trusts and investments    
Investments [Abstract]    
Employee benefit trusts and investments 14 10
Pepco Holdings LLC [Member]    
Investments [Abstract]    
Equity investments without readily determinable fair values   0
Total Investments 145 140
Accrued Expenses [Abstract]    
Compensation-related accruals 113 109
Taxes accrued 96 117
Interest accrued 52 51
Pepco Holdings LLC [Member] | Other Equity Method Investments    
Investments [Abstract]    
Equity Method Investments 0 0
Pepco Holdings LLC [Member] | Employee benefit trusts and investments    
Investments [Abstract]    
Employee benefit trusts and investments 145 140
Potomac Electric Power Company [Member]    
Investments [Abstract]    
Equity investments without readily determinable fair values   0
Total Investments 120 115
Accrued Expenses [Abstract]    
Compensation-related accruals 35 36
Taxes accrued 88 90
Interest accrued 28 26
Potomac Electric Power Company [Member] | Other Equity Method Investments    
Investments [Abstract]    
Equity Method Investments 0 0
Potomac Electric Power Company [Member] | Employee benefit trusts and investments    
Investments [Abstract]    
Employee benefit trusts and investments 120 115
Delmarva Power & Light Company [Member]    
Accrued Expenses [Abstract]    
Compensation-related accruals 20 18
Taxes accrued 9 18
Interest accrued 8 7
Atlantic City Electric Company [Member]    
Accrued Expenses [Abstract]    
Compensation-related accruals 17 17
Taxes accrued 11 12
Interest accrued $ 11 $ 12