Other Financial Statement Details - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Balances of Other Comprehensive Income (Loss), Tax
Beginning balance	$ (3)	$ 6	$ 2	$ 6
Other comprehensive income (loss) before reclassifications	0	(2)	(5)	(2)
Less: Amount of gain (loss) reclassified from accumulated other comprehensive income	0	0	0	0
Net current period other comprehensive income (loss)	0	(2)	(5)	(2)
Ending balance	(3)	4	(3)	4
Accumulated Balances of Other Comprehensive Income (Loss), Net of Tax
Beginning balance	16,139	15,019	15,386	15,994
Other comprehensive income (loss), net of tax	(24)	30	(130)	208
Ending balance	16,483	15,115	16,483	15,115
Accumulated Other Comprehensive Income (Loss)
Accumulated Balances of Other Comprehensive Income (Loss), Net of Tax
Beginning balance	(28)	36	78	(142)
Other comprehensive income (loss) before reclassifications	45	38	49	142
Less: Amount of gain (loss) reclassified from accumulated other comprehensive income	69	8	179	(66)
Other comprehensive income (loss), net of tax	(24)	30	(130)	208
Ending balance	(52)	66	(52)	66
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Balances of Other Comprehensive Income (Loss), Before Tax
Beginning balance	118	104	182	(111)
Other comprehensive income (loss) before reclassifications, before tax	141	41	187	183
Less: Amount of gain (loss) reclassified from accumulated other comprehensive income	70	7	180	(66)
Net current period other comprehensive income (loss)	71	34	7	249
Ending balance	189	138	189	138
Unrealized Gains (Losses) on Investments
Accumulated Balances of Other Comprehensive Income (Loss), Before Tax
Beginning balance	8	(22)	(13)	(12)
Other comprehensive income (loss) before reclassifications, before tax	(6)	5	15	(6)
Less: Amount of gain (loss) reclassified from accumulated other comprehensive income	(1)	1	(1)	0
Net current period other comprehensive income (loss)	(5)	4	16	(6)
Ending balance	3	(18)	3	(18)
Foreign Currency Translation
Accumulated Balances of Other Comprehensive Income (Loss), Before Tax
Beginning balance	(151)	(52)	(93)	(25)
Other comprehensive income (loss) before reclassifications, before tax	(90)	(6)	(148)	(33)
Less: Amount of gain (loss) reclassified from accumulated other comprehensive income	0	0	0	0
Net current period other comprehensive income (loss)	(90)	(6)	(148)	(33)
Ending balance	$ (241)	$ (58)	$ (241)	$ (58)

AOCI, Before Tax [Roll Forward]

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Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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