Employee Benefit Plans (Components of Net Periodic Benefit Cost (Credit) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 3	$ 6	$ 7
Interest cost	5	5	16	15
Expected return on assets	(12)	(12)	(37)	(36)
Amortization of actuarial losses	1	1	1	4
Net periodic benefit cost (credit)	(4)	(3)	(14)	(10)
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	1	1
Interest cost	1	1	4	4
Expected return on assets	0	0	0	0
Amortization of actuarial losses	0	0	0	0
Net periodic benefit cost (credit)	$ 1	$ 1	$ 5	$ 5