Employee Benefit Plans (Components of Net Periodic Benefit Cost (Credit) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 2
Interest cost	8	8
Expected return on assets	(9)	(8)
Amortization of actuarial losses	2	3
Net periodic benefit cost (credit)	3	5
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	2	2
Expected return on assets	0	0
Amortization of actuarial losses	(1)	(1)
Net periodic benefit cost (credit)	$ 1	$ 1