Other Financial Statement Details - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Balances of Other Comprehensive Income (Loss), Tax
AOCI tax, beginning balance	$ 2	$ 6	$ 1
Other comprehensive income (loss) before reclassifications, tax	(2)	(4)	5
Less: Amount of gain (loss) reclassified from accumulated other comprehensive income, tax	0	0	0
Net current period other comprehensive income (loss), tax	(2)	(4)	5
AOCI tax, ending balance	0	2	6
Accumulated Balances of Other Comprehensive Income (Loss), Net of Tax
Beginning balance	15,386
Other comprehensive income (loss) before reclassifications, net of tax	(14)	190	(193)
Less: Amount of gain (loss) reclassified from accumulated other comprehensive income, net of tax	237	(30)	8
Other comprehensive income (loss), net of tax	(251)	220	(201)
Ending balance	16,885	15,386
AOCI Attributable to Parent
Accumulated Balances of Other Comprehensive Income (Loss), Net of Tax
Beginning balance	78	(142)	59
Ending balance	(173)	78	(142)
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Balances of Other Comprehensive Income (Loss), Before Tax
AOCI before tax, beginning balance	182	(111)
Other comprehensive income (loss) before reclassifications, before tax	62	263
Less: Amount of gain (loss) reclassified from AOCI, before tax	238	(30)
Net current period other comprehensive income (loss), before tax	(176)	293
AOCI before tax, ending balance	6	182	(111)
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Balances of Other Comprehensive Income (Loss), Before Tax
AOCI before tax, beginning balance		(111)	131
Other comprehensive income (loss) before reclassifications, before tax			(225)
Less: Amount of gain (loss) reclassified from AOCI, before tax			17
Net current period other comprehensive income (loss), before tax			(242)
AOCI before tax, ending balance			(111)
Unrealized Gains (Losses) on Investments
Accumulated Balances of Other Comprehensive Income (Loss), Before Tax
AOCI before tax, beginning balance	(13)	(12)	(5)
Other comprehensive income (loss) before reclassifications, before tax	14	(1)	(16)
Less: Amount of gain (loss) reclassified from AOCI, before tax	(1)	0	(9)
Net current period other comprehensive income (loss), before tax	15	(1)	(7)
AOCI before tax, ending balance	2	(13)	(12)
Foreign Currency Translation Adjustment (“CTA”)
Accumulated Balances of Other Comprehensive Income (Loss), Before Tax
AOCI before tax, beginning balance	(93)	(25)	(68)
Other comprehensive income (loss) before reclassifications, before tax	(57)	(68)	43
Less: Amount of gain (loss) reclassified from AOCI, before tax	0	0	0
Net current period other comprehensive income (loss), before tax	(57)	(68)	43
AOCI before tax, ending balance	(150)	(93)	$ (25)
Net Investment Hedge CTA Gain (Loss)
Accumulated Balances of Other Comprehensive Income (Loss), Before Tax
AOCI before tax, beginning balance	0
Other comprehensive income (loss) before reclassifications, before tax	(31)
Less: Amount of gain (loss) reclassified from AOCI, before tax	0
Net current period other comprehensive income (loss), before tax	(31)
AOCI before tax, ending balance	$ (31)	$ 0