Employee Benefits - Postretirement Benefits Other Than Pension Expenses (Detail) - Defined Contribution and Other Retirement Plans - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Interest cost on projected benefit obligation	$ 1	$ 1	$ 2	$ 1
Net amortization and deferrals	(2)	(1)	(3)	(2)
Net periodic benefit (income) cost	$ (1)	$ 0	$ (1)	$ (1)