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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
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