Accumulated Other Comprehensive Income (Loss) ("AOCI") - Components of AOCI (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated other comprehensive income (loss), Beginning balance		$ (147)			$ (147)
Amounts reclassified from accumulated other comprehensive income (loss)					10
Net current-period other comprehensive income (loss)	$ 1	2	$ 2	$ 1
Accumulated other comprehensive income (loss), Ending balance	(144)				(144)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income (loss), Beginning balance		(147)		(145)	(147)	$ (145)
Other comprehensive income (loss) before reclassifications					(7)	3
Amounts reclassified from accumulated other comprehensive income (loss)					10
Net current-period other comprehensive income (loss)	1	$ 2	2	$ 1	3	3
Accumulated other comprehensive income (loss), Ending balance	$ (144)		$ (142)		$ (144)	$ (142)