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Benefit Plans and Other Postretirement Benefits Net Periodic Benefit Cost (Credit) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Operating and maintenance expenses | $ 2,540,000,000 | $ 2,444,000,000 | $ 2,491,000,000
transferred | 0 | 0 |
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 76,000,000 | 74,000,000 | 97,000,000
Operating and maintenance expenses | $ 8,000,000 | $ 0 | $ 9

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