Other Financial Statement Details - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Balances of Other Comprehensive Income (Loss), Tax
Beginning balance	$ 0	$ 2
Other comprehensive income (loss) before reclassifications	(6)	(1)
Less: Amount of gain reclassified from accumulated other comprehensive income (“AOCI”)	0	0
Net current period other comprehensive income (loss)	(6)	(1)
Ending balance	(6)	1
Accumulated Balances of Other Comprehensive Income (Loss), Net of Tax
Beginning balance	16,885
Other comprehensive income (loss), net of tax	53	(103)
Ending balance	15,967
Accumulated Other Comprehensive Income (Loss)
Accumulated Balances of Other Comprehensive Income (Loss), Net of Tax
Beginning balance	(173)	78
Other comprehensive income (loss) before reclassifications	95	(51)
Less: Amount of gain reclassified from accumulated other comprehensive income (“AOCI”)	42	52
Other comprehensive income (loss), net of tax	53	(103)
Ending balance	(120)	(25)
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Balances of Other Comprehensive Income (Loss), Before Tax
Beginning balance	6	182
Other comprehensive income (loss) before reclassifications	186	6
Less: Amount of gain reclassified from accumulated other comprehensive income (“AOCI”)	42	52
Net current period other comprehensive income (loss)	144	(46)
Ending balance	150	136
Unrealized Gains (Losses) on Investments
Accumulated Balances of Other Comprehensive Income (Loss), Before Tax
Beginning balance	2	(13)
Other comprehensive income (loss) before reclassifications	15	11
Less: Amount of gain reclassified from accumulated other comprehensive income (“AOCI”)	0	0
Net current period other comprehensive income (loss)	15	11
Ending balance	17	(2)
Foreign Currency Translation Adjustment (“CTA”)
Accumulated Balances of Other Comprehensive Income (Loss), Before Tax
Beginning balance	(150)	(93)
Other comprehensive income (loss) before reclassifications	(171)	(67)
Less: Amount of gain reclassified from accumulated other comprehensive income (“AOCI”)	0	0
Net current period other comprehensive income (loss)	(171)	(67)
Ending balance	(321)	$ (160)
Net InvestmentHedge CTA Gain (Loss)
Accumulated Balances of Other Comprehensive Income (Loss), Before Tax
Beginning balance	(31)
Other comprehensive income (loss) before reclassifications	71
Less: Amount of gain reclassified from accumulated other comprehensive income (“AOCI”)	0
Net current period other comprehensive income (loss)	71
Ending balance	$ 40