Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 2,883	$ 256	$ 7,046	$ 1,176
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax of $10, $2, $(5), and $19	(101)	104	(512)	486
Net change in unrealized gains (losses) on available-for-sale debt securities:
Unrealized gains (losses), net of tax of $(1), $0, $1, and $8	0	(2)	(43)	(10)
Reclassification adjustment for losses (gains) included in “Other income (expense), net,” net of tax of $0, $0, $0, and $0	1	3	5	8
Net unrealized gains (losses) on available-for-sale debt securities	1	1	(38)	(2)
Total other comprehensive income (loss)	(100)	105	(550)	484
Comprehensive income	$ 2,783	$ 361	$ 6,496	$ 1,660