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Comprehensive Income (Reclassification Out Of AOCI) (Details) - Reclassification Out Of Accumulated Other Comprehensive Income [Member] - OPEB [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Amortization Of Defined Benefit Cost Items [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income (loss) before income taxes | $ 25 | $ 22 | $ 13
Tax impact | (6) | (5) | (2)
Reclassifications, net of tax | 19 | 17 | 11
Prior-Service Costs [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income (loss) before income taxes | $ 25 | $ 22 | $ 13

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