Employee Benefits - Components of Net Periodic Benefit Cost and Changes in Plan Assets and Benefit Obligations Recognized in OCI (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (income) cost	$ (28)	$ (19)	$ (34)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	0	1	1
Interest cost on projected benefit obligation	3	1	7
Net amortization and deferrals	(6)	(5)	(20)
Net periodic benefit (income) cost	(3)	(3)	$ (12)
Net actuarial loss (gain)	3	(16)
Recognized actuarial (loss) gain	0	(1)
Recognized prior service credit	5	6
Total loss (gain) recognized in OCI (before tax effects)	$ 8	$ (11)