Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
AOCI roll forward
Beginning balance	$ 6,896	$ 6,864	$ 7,126
Other comprehensive income (loss), net of tax	(78)	32	(86)
Ending balance	8,254	6,896	6,864
Unrealized gain (loss) on investment		(23)
Unrealized gain (loss) on investment, tax		(8)
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI roll forward
Beginning balance	(37)	(69)	17
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit)	(75)	35	(88)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit	(3)	(3)	2
Other comprehensive income (loss), net of tax	(78)	32	(86)
Ending balance	(115)	(37)	(69)
Derivative Instruments [Member]
AOCI roll forward
Beginning balance	17	3
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit)	30	16
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit	(3)	(2)	3
Other comprehensive income (loss), net of tax	27	14	3
Ending balance	44	17	3
Other comprehensive income (loss) before reclassifications, tax	10	5	0
Amounts reclassified from accumulated other comprehensive (income) loss, tax	1	(1)	1
Available-for-Sale Securities [Member]
AOCI roll forward
Beginning balance	8	19	43
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit)	7	(11)	(24)
Other comprehensive income (loss), net of tax	7	(11)	(24)
Ending balance	15	8	19
Other comprehensive income (loss) before reclassifications, tax	3	(4)	(8)
Amounts reclassified from accumulated other comprehensive (income) loss, tax	0	0	0
Foreign Currency Translation Adjustments [Member]
AOCI roll forward
Beginning balance	(68)	(94)	(29)
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit)	(111)	26	(65)
Other comprehensive income (loss), net of tax	(111)	26	(65)
Ending balance	(179)	(68)	(94)
Other comprehensive income (loss) before reclassifications, tax	0	0	0
Amounts reclassified from accumulated other comprehensive (income) loss, tax	0	0	0
Post - Retirement Benefit Obligations [Member]
AOCI roll forward
Beginning balance	6	3	3
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit)	(1)	4	1
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit		(1)	(1)
Other comprehensive income (loss), net of tax	(1)	3
Ending balance	5	6	3
Other comprehensive income (loss) before reclassifications, tax	0	2	0
Amounts reclassified from accumulated other comprehensive (income) loss, tax	$ 0	$ 0	$ 0