Accumulated Other Comprehensive Income - Changes in Accumulated Balances of Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss), Tax
Beginning balance	$ 37	$ 21
Other comprehensive income (loss) before reclassifications	(5)	(2)
Less: Amount of gain (loss) reclassified from AOCI	2	(7)
Net current period other comprehensive income (loss)	(7)	5
Ending balance	30	26
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning balance	6,396
Other comprehensive income (loss) before reclassifications	(20)	(3)
Less: Amount of gain (loss) reclassified from AOCI	(6)	25
Other comprehensive income (loss), net of tax	(14)	(28)
Ending balance	6,273	5,387
Unrealized Gains (Losses) on Derivative Instruments
Accumulated Other Comprehensive Income (Loss), Before Tax
Beginning balance	(13)	114
Other comprehensive income (loss) before reclassifications	14	(21)
Less: Amount of gain (loss) reclassified from AOCI	(8)	32
Net current period other comprehensive income (loss)	22	(53)
Ending balance	9	61
Unrealized Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss), Before Tax
Beginning balance	(45)	(98)
Other comprehensive income (loss) before reclassifications	8	19
Less: Amount of gain (loss) reclassified from AOCI	0	0
Net current period other comprehensive income (loss)	8	19
Ending balance	(37)	(79)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Before Tax
Beginning balance	206	222
Other comprehensive income (loss) before reclassifications	(37)	1
Less: Amount of gain (loss) reclassified from AOCI	0	0
Net current period other comprehensive income (loss)	(37)	1
Ending balance	169	223
Accumulated other comprehensive income:
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning balance	185	259
Ending balance	$ 171	$ 231