Segment Information - Reportable Segments and Reconciliation to Consolidated Net Income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total net sales	$ 87,437	$ 69,981	$ 63,404	$ 59,700	$ 72,383	$ 56,576	$ 52,886	$ 51,042	$ 280,522	$ 232,887	$ 177,866
Operating expenses									265,981	220,466	173,760
Operating income (loss)	3,879	3,157	3,084	4,420	3,786	3,724	2,983	1,927	14,541	12,421	4,106
Total non-operating income (expense)									(565)	(1,160)	(300)
Provision for income taxes	(786)	(494)	(257)	(836)	(327)	(508)	(74)	(287)	(2,374)	(1,197)	(769)
Equity-method investment activity, net of tax									(14)	9	(4)
Net income	$ 3,268	$ 2,134	$ 2,625	$ 3,561	$ 3,027	$ 2,883	$ 2,534	$ 1,629	11,588	10,073	3,033
North America
Segment Reporting Information [Line Items]
Total net sales									170,773	141,366	106,110
Operating expenses									163,740	134,099	103,273
Operating income (loss)									7,033	7,267	2,837
International
Segment Reporting Information [Line Items]
Total net sales									74,723	65,866	54,297
Operating expenses									76,416	68,008	57,359
Operating income (loss)									(1,693)	(2,142)	(3,062)
AWS
Segment Reporting Information [Line Items]
Total net sales									35,026	25,655	17,459
Operating expenses									25,825	18,359	13,128
Operating income (loss)									$ 9,201	$ 7,296	$ 4,331