Derivative Instruments And Hedging Activities - Gains (Losses) Recognized in AOCI and Reclassified from AOCI on Derivatives (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Total, amount of gain/loss) recognized in AOCI on derivative, net of tax	$ (469)	$ 222	$ (132)
Cash flow hedging relationships, amount of gain/(loss) reclassified from AOCI into income, net of tax	(1)	(2)	(1)
Total, amount of gain/loss) reclassified from AOCI into income, net of tax	(1)	(2)	(1)
Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	62	47	54
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	(469)	222	(132)
Net investment hedging relationships, amount of gain/(loss) reclassified from AOCI into income, net of tax	0	0	0
Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	62	47	54
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
Cash flow hedging relationships, amount of gain/(loss) reclassified from AOCI into income, net of tax	(1)	(2)	(1)
Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	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	(339)	157	(97)
Net investment hedging relationships, amount of gain/(loss) reclassified from AOCI into income, net of tax	0	0	0
Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	62	47	54
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
Cash flow hedging relationships, amount of gain/(loss) reclassified from AOCI into income, net of tax	1	0	1
Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	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	(130)	65	(35)
Net investment hedging relationships, amount of gain/(loss) reclassified from AOCI into income, net of tax	0	0	0
Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	0	0	0
Interest Rate Contract [Member] | 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
Cash flow hedging relationships, amount of gain/(loss) reclassified from AOCI into income, net of tax	(2)	(2)	(2)
Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing)	$ 0	$ 0	$ 0