Employee Benefit Plans and Equity Compensation Plan (Schedule of Defined Benefit Plan, Amounts Recognized in Accumulated Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial (gain) loss	$ (1)	$ 2	$ (3)
Total recognized in other comprehensive income	(1)	2	(3)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial (gain) loss	0	(1)	0
Total recognized in other comprehensive income	$ 0	$ (1)	$ 0