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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
	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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