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Comprehensive Income (Reclassification Out Of AOCI) (Details) - Reclassification Out Of Accumulated Other Comprehensive Income [Member] - OPEB [Member] - Amortization Of Defined Benefit Cost Items [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income (loss) before income taxes | $ 7 | $ 6 | $ 19 | $ 19
Tax impact | (2) | (1) | (5) | (4)
Reclassifications, net of tax | $ 5 | $ 5 | $ 14 | $ 15

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