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, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial (gain) loss	$ 2	$ (3)	$ 2
Total recognized in other comprehensive income	2	(3)	2
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial (gain) loss	(1)	0	(2)
Total recognized in other comprehensive income	$ (1)	$ 0	$ (2)