Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 2,134	$ 2,883	$ 8,320	$ 7,046
Net change in foreign currency translation adjustments:
Foreign currency translation adjustments, net of tax of $2, $1, $19, and $(6)	(368)	(101)	(369)	(512)
Reclassification adjustment for foreign currency translation included in “Other operating expense (income), net,” net of tax of $0, $29, $0, and $29	(108)	0	(108)	0
Net foreign currency translation adjustments	(476)	(101)	(477)	(512)
Net change in unrealized gains (losses) on available-for-sale debt securities:
Unrealized gains (losses), net of tax of $0, $(2), $8, and $(13)	9	0	85	(43)
Reclassification adjustment for losses (gains) included in “Other income (expense), net,” net of tax of $0, $0, $0, and $0	(2)	1	(2)	5
Net unrealized gains (losses) on available-for-sale debt securities	7	1	83	(38)
Total other comprehensive income (loss)	(469)	(100)	(394)	(550)
Comprehensive income	$ 1,665	$ 2,783	$ 7,926	$ 6,496