Accumulated Other Comprehensive Income - Changes in Accumulated Balances of Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss), Tax
Beginning balance	$ 12	$ 42
Other comprehensive income (loss) before reclassifications	8	(11)
Less: Amount of gain (loss) reclassified from AOCI	(1)	6
Net current period other comprehensive income (loss)	9	(17)
Ending balance	21	25
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning balance	9,778
Other comprehensive income (loss) before reclassifications	(50)	(85)
Less: Amount of gain (loss) reclassified from AOCI	6	(22)
Other comprehensive income (loss), net of tax	(56)	(63)
Ending balance	7,054	3,770
Unrealized Gains (Losses) on Derivative Instruments
Accumulated Other Comprehensive Income (Loss), Before Tax
Beginning balance	65	(85)
Other comprehensive income (loss) before reclassifications	27	46
Less: Amount of gain (loss) reclassified from AOCI	7	(28)
Net current period other comprehensive income (loss)	20	74
Ending balance	85	(11)
Unrealized Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss), Before Tax
Beginning balance	(7)	5
Other comprehensive income (loss) before reclassifications	(51)	(3)
Less: Amount of gain (loss) reclassified from AOCI	0	0
Net current period other comprehensive income (loss)	(51)	(3)
Ending balance	(58)	2
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Before Tax
Beginning balance	328	654
Other comprehensive income (loss) before reclassifications	(34)	(117)
Less: Amount of gain (loss) reclassified from AOCI	0	0
Net current period other comprehensive income (loss)	(34)	(117)
Ending balance	294	537
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning balance	398	616
Ending balance	$ 342	$ 553