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Employee Benefits - Postretirement Benefits Other Than Pension Expenses (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) cost	$ (3)	$ (1)	$ (4)	$ (4)
Defined Contribution and Other Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost on projected benefit obligation	1	1	2	2
Net amortization and deferrals	0	(1)	(1)	(2)
Net periodic benefit (income) cost	$ 1	$ 0	$ 1	$ 0

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