Other Financial Statement Details - Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Income and Expenses [Abstract]
Interest income	$ 47	$ 61	$ 144	$ 116
Interest expense	(29)	(22)	(78)	(57)
Gains (losses) on strategic investments	(228)	0	170	31
Other	(3)	4	(12)	4
Other income (expense), net	$ (213)	$ 43	$ 224	$ 94