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Employee Benefits - Postretirement Benefits Other Than Pension Expenses (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	$ (1)	$ (1)
Defined Contribution and Other Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost on projected benefit obligation	1	1
Net amortization and deferrals	(1)	(1)
Net periodic benefit cost	$ 0	$ 0

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