Amount after tax of reclassification adjustments of other comprehensive income (loss).

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+ Details

Accumulated Other Comprehensive Income (Loss) - Reclassifications of Accumulated Other Comprehensive Income to Consolidated Statement of Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			$ 0	$ 1
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ 2	$ 0	6	(3)
Reclassification out of Accumulated Other Comprehensive Income \| Pension and Postretirement Liability Adjustment
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Total	$ 2	$ 0	$ 6	$ (2)