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Employee Benefits - Postretirement Benefits Other Than Pension Expenses (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) cost	$ (1)	$ (5)	$ (3)	$ (10)
Defined Contribution and Other Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost on projected benefit obligation	0	1	1	2
Net amortization and deferrals	0	(2)	(1)	(3)
Net periodic benefit (income) cost	$ 0	$ (1)	$ 0	$ (1)

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Defined Benefit Plan, Amortization And Deferrals, Net

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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