Fair Value Measurements - Change in Balance Sheet Carrying Value Associated with Level 3 Financial Instruments Carried at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	$ (224)	$ (226)	$ (190)	$ (255)
Total gains/(losses):
Included in earnings	$ (9)	$ (22)	$ (53)	$ (6)
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain (Loss) on Derivative Instruments, Net, Pretax	Gain (Loss) on Derivative Instruments, Net, Pretax	Gain (Loss) on Derivative Instruments, Net, Pretax	Gain (Loss) on Derivative Instruments, Net, Pretax
Included in other comprehensive income	$ 0	$ 0	$ 0	$ 0
Settlements	10	12	20	25
Transfers in and/or out of level 3	0	0	0	0
Balance, end of period	(223)	(236)	(223)	(236)
Change in mark-to-market gains/(losses) relating to instruments still held at the reporting date	1	(10)	(33)	19
Interest Rate Swaps [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	(1)	(2)	(1)	(2)
Total gains/(losses):
Included in earnings	0	0	0	0
Included in other comprehensive income	0	0	0	0
Settlements	0	0	0	0
Transfers in and/or out of level 3	0	0	0	0
Balance, end of period	(1)	(2)	(1)	(2)
Change in mark-to-market gains/(losses) relating to instruments still held at the reporting date	0	0	0	0
Cross-Currency Interest Rate Swaps [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	(223)	(224)	(189)	(253)
Total gains/(losses):
Included in earnings	(9)	(22)	(53)	(6)
Included in other comprehensive income	0	0	0	0
Settlements	10	12	20	25
Transfers in and/or out of level 3	0	0	0	0
Balance, end of period	(222)	(234)	(222)	(234)
Change in mark-to-market gains/(losses) relating to instruments still held at the reporting date	1	(10)	(33)	19
Other [Member]
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	0	0	0	0
Total gains/(losses):
Included in earnings	0	0	0	0
Included in other comprehensive income	0	0	0	0
Settlements	0	0	0	0
Transfers in and/or out of level 3	0	0	0	0
Balance, end of period	0	0	0	0
Change in mark-to-market gains/(losses) relating to instruments still held at the reporting date	$ 0	$ 0	$ 0	$ 0