Derivative Instruments And Hedging Activities - Gains (Losses) Recognized in AOCI and Reclassified from AOCI on Derivatives (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Total, Amount of Gain/(Loss) Recognized in AOCI on Derivative, net of Tax	$ (28)	$ 181	$ (85)	$ 228
Cash Flow Hedging Relationships, Amount of Gain/(Loss) Reclassified from AOCI into Income, net of Tax	1	0	0	(1)
Total, Amount of Gain/(Loss) Reclassified from AOCI into Income, net of Tax	1	(1)	0	(1)
Gain Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	14	11	30	21
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	(28)	181	(85)	228
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)	14	11	30	21
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	(1)	0	(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	(24)	118	(63)	142
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)	14	11	30	21
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	0	0
Cash Flow Hedging Relationships, Amount of Gain/(Loss) Reclassified from AOCI into Income, net of Tax	1	0	1	0
Gain Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	0	0	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	(4)	63	(22)	86
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	0	(1)	(1)	(1)
Gain Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	$ 0	$ 0	$ 0	$ 0