Derivative Instruments And Hedging Activities - Gains (Losses) Recognized in AOCI and Reclassified from AOCI on Derivatives (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Total, Amount of Gain/(Loss) Recognized in AOCI on Derivative, net of Tax	$ 93	$ 193	$ 8	$ 421
Cash Flow Hedging Relationships, Amount of Gain/(Loss) Reclassified from AOCI into Income, net of Tax	(1)	0	(1)	(1)
Total, Amount of Gain/(Loss) Reclassified from AOCI into Income, net of Tax	(1)	0	(1)	(1)
Gain Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	13	17	43	38
Net Investment Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Net Investment Hedging Relationships, Amount of Gain/(Loss) Recognized in AOCI on Derivative, net of Tax	93	193	8	421
Net investment hedges - reclassification of gains included in net income - Net of Tax	0	0	0	0
Gain Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	13	17	43	38
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Cash Flow Hedging Relationships, Amount of Gain/(Loss) Recognized in AOCI on Derivative, net of Tax	0	0	0	0
Cash Flow Hedging Relationships, Amount of Gain/(Loss) Reclassified from AOCI into Income, net of Tax	(1)	0	(1)	(1)
Gain Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	0	0	0	0
Currency Swap | Net Investment Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Net Investment Hedging Relationships, Amount of Gain/(Loss) Recognized in AOCI on Derivative, net of Tax	63	131	0	273
Net investment hedges - reclassification of gains included in net income - Net of Tax	0	0	0	0
Gain Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	13	17	43	38
Currency Swap | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Cash Flow Hedging Relationships, Amount of Gain/(Loss) Recognized in AOCI on Derivative, net of Tax			0	0
Cash Flow Hedging Relationships, Amount of Gain/(Loss) Reclassified from AOCI into Income, net of Tax			1	0
Gain Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)			0	0
Long-term debt | Net Investment Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Net Investment Hedging Relationships, Amount of Gain/(Loss) Recognized in AOCI on Derivative, net of Tax	30	62	8	148
Net investment hedges - reclassification of gains included in net income - Net of Tax	0	0	0	0
Gain Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	0	0	0	0
Interest rate contracts | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Cash Flow Hedging Relationships, Amount of Gain/(Loss) Recognized in AOCI on Derivative, net of Tax	0	0	0	0
Cash Flow Hedging Relationships, Amount of Gain/(Loss) Reclassified from AOCI into Income, net of Tax	(1)	0	(2)	(1)
Gain Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	$ 0	$ 0	$ 0	$ 0