Segment Information - Reportable Segments and Reconciliation to Consolidated Net Income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total net sales	$ 125,555	$ 96,145	$ 88,912	$ 75,452	$ 87,437	$ 69,981	$ 63,404	$ 59,700	$ 386,064	$ 280,522	$ 232,887
Operating expenses									363,165	265,981	220,466
Operating income (loss)	6,873	6,194	5,843	3,989	3,879	3,157	3,084	4,420	22,899	14,541	12,421
Total non-operating income (expense)									1,279	(565)	(1,160)
Provision for income taxes	(566)	(569)	(984)	(744)	(786)	(494)	(257)	(836)	(2,863)	(2,374)	(1,197)
Equity-method investment activity, net of tax									16	(14)	9
Net income	$ 7,222	$ 6,331	$ 5,243	$ 2,535	$ 3,268	$ 2,134	$ 2,625	$ 3,561	21,331	11,588	10,073
North America
Segment Reporting Information [Line Items]
Total net sales									236,282	170,773	141,366
Operating expenses									227,631	163,740	134,099
Operating income (loss)									8,651	7,033	7,267
International
Segment Reporting Information [Line Items]
Total net sales									104,412	74,723	65,866
Operating expenses									103,695	76,416	68,008
Operating income (loss)									717	(1,693)	(2,142)
AWS
Segment Reporting Information [Line Items]
Total net sales									45,370	35,026	25,655
Operating expenses									31,839	25,825	18,359
Operating income (loss)									$ 13,531	$ 9,201	$ 7,296