Fair Value Measurements - Derivatives in Cash Flow Hedging Relationships (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Interest Rate Swap Arrangements
Derivative Instruments Gain Loss [Line Items]
Amount of (Gain)/Loss Recognized in OCI (Effective Portion)	$ (6)		$ (17)	$ (1)
Interest Expense
Derivative Instruments Gain Loss [Line Items]
Amount of (Gain)/Loss Reclassified from AOCI into Income (Effective Portion)	$ 4	$ 7	$ 9	$ 13