Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI roll forward
Beginning balance	$ 6,864	$ 7,126	$ 7,454
Other comprehensive income (loss), net of tax	32	(86)	(22)
Ending balance	6,896	6,864	7,126
Unrealized gain (loss) on investment	(23)
Unrealized gain (loss) on investment, tax	(8)
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI roll forward
Beginning balance	(69)	17	39
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit)	35	(88)	6
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit	(3)	2	(28)
Other comprehensive income (loss), net of tax	32	(86)	(22)
Ending balance	(37)	(69)	17
Derivative Instruments [Member]
AOCI roll forward
Beginning balance	3		(9)
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit)	16
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit	(2)	3	9
Other comprehensive income (loss), net of tax	14	3	9
Ending balance	17	3
Other comprehensive income (loss) before reclassifications, tax	5	0	0
Amounts reclassified from accumulated other comprehensive (income) loss, tax	(1)	1	3
Available-for-Sale Securities [Member]
AOCI roll forward
Beginning balance	19	43	49
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit)	(11)	(24)	(6)
Other comprehensive income (loss), net of tax	(11)	(24)	(6)
Ending balance	8	19	43
Other comprehensive income (loss) before reclassifications, tax	(4)	(8)	(2)
Amounts reclassified from accumulated other comprehensive (income) loss, tax	0	0	0
Foreign Currency Translation Adjustments [Member]
AOCI roll forward
Beginning balance	(94)	(29)	(1)
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit)	26	(65)	7
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit			(35)
Other comprehensive income (loss), net of tax	26	(65)	(28)
Ending balance	(68)	(94)	(29)
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	3	3
Other comprehensive income (loss) before reclassifications, net of tax expense (benefit)	4	1	5
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit	(1)	(1)	(2)
Other comprehensive income (loss), net of tax	3		3
Ending balance	6	3	3
Other comprehensive income (loss) before reclassifications, tax	2	0	2
Amounts reclassified from accumulated other comprehensive (income) loss, tax	$ 0	$ 0	$ 0