Employee Benefit Plans (Components of Net Periodic Benefit Cost (Credit) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 2	$ 4	$ 4
Interest cost	8	6	16	11
Expected return on assets	(9)	(13)	(17)	(25)
Amortization of actuarial losses	3	0	6
Net periodic benefit cost (credit)	4	(5)	9	(10)
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1	1
Interest cost	2	1	4	3
Amortization of actuarial losses	(1)		(2)
Net periodic benefit cost (credit)	$ 2	$ 2	$ 3	$ 4