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Supplemental Financial Information - Taxes Other Than Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Supplemental Statement of Operations Information [Line Items] |  |  |  |
Utility taxes | $ 248 | $ 244 | $ 695 | $ 665
Property | 111 | 104 | 323 | 300
Payroll | 33 | 31 | 100 | 93
Commonwealth Edison Co |  |  |  |
Supplemental Statement of Operations Information [Line Items] |  |  |  |
Utility taxes | 80 | 82 | 229 | 228
Property | 7 | 9 | 25 | 27
Payroll | 9 | 8 | 27 | 22
PECO Energy Co |  |  |  |
Supplemental Statement of Operations Information [Line Items] |  |  |  |
Utility taxes | 51 | 50 | 134 | 128
Property | 5 | 4 | 14 | 12
Payroll | 4 | 4 | 13 | 13
Baltimore Gas and Electric Company |  |  |  |
Supplemental Statement of Operations Information [Line Items] |  |  |  |
Utility taxes | 25 | 23 | 78 | 73
Property | 57 | 53 | 164 | 153
Payroll | 5 | 5 | 14 | 14
Pepco Holdings LLC |  |  |  |
Supplemental Statement of Operations Information [Line Items] |  |  |  |
Utility taxes | 92 | 89 | 254 | 236
Property | 41 | 38 | 119 | 108
Payroll | 7 | 7 | 22 | 22
Potomac Electric Power Company |  |  |  |
Supplemental Statement of Operations Information [Line Items] |  |  |  |
Utility taxes | 84 | 82 | 230 | 213
Property | 28 | 25 | 81 | 73
Payroll | 2 | 2 | 6 | 5
Delmarva Power and Light Company |  |  |  |
Supplemental Statement of Operations Information [Line Items] |  |  |  |
Utility taxes | 7 | 6 | 21 | 20
Property | 12 | 12 | 35 | 34
Payroll | 1 | 1 | 3 | 3
Atlantic City Electric Company |  |  |  |
Supplemental Statement of Operations Information [Line Items] |  |  |  |
Utility taxes | 1 | 1 | 3 | 3
Property | 1 | 1 | 2 | 1
Payroll | $ 0 | $ 1 | $ 2 | $ 3

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