Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 10,073	$ 3,033	$ 2,371
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax of $(49), $5, and $6	(538)	533	(279)
Net change in unrealized gains (losses) on available-for-sale debt securities:
Unrealized gains (losses), net of tax of $(12), $5, and $0	(17)	(39)	9
Reclassification adjustment for losses (gains) included in “Other income (expense), net,” net of tax of $0, $0, and $0	8	7	8
Net unrealized gains (losses) on available-for-sale debt securities	(9)	(32)	17
Total other comprehensive income (loss)	(547)	501	(262)
Comprehensive income	$ 9,526	$ 3,534	$ 2,109