Segment Information - Reportable Segments and Reconciliation to Consolidated Net Income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total net sales	$ 72,383	$ 56,576	$ 52,886	$ 51,042	$ 60,453	$ 43,744	$ 37,955	$ 35,714	$ 232,887	$ 177,866	$ 135,987
Operating expenses									220,466	173,760	131,801
Operating income (loss)	3,786	3,724	2,983	1,927	2,127	347	628	1,005	12,421	4,106	4,186
Total non-operating income (expense)									(1,160)	(300)	(294)
Provision for income taxes	(327)	(508)	(74)	(287)	(16)	(58)	(467)	(229)	(1,197)	(769)	(1,425)
Equity-method investment activity, net of tax									9	(4)	(96)
Net income	$ 3,027	$ 2,883	$ 2,534	$ 1,629	$ 1,856	$ 256	$ 197	$ 724	10,073	3,033	2,371
North America
Segment Reporting Information [Line Items]
Total net sales									141,366	106,110	79,785
Operating expenses									134,099	103,273	77,424
Operating income (loss)									7,267	2,837	2,361
International
Segment Reporting Information [Line Items]
Total net sales									65,866	54,297	43,983
Operating expenses									68,008	57,359	45,266
Operating income (loss)									(2,142)	(3,062)	(1,283)
AWS
Segment Reporting Information [Line Items]
Total net sales									25,655	17,459	12,219
Operating expenses									18,359	13,128	9,111
Operating income (loss)									$ 7,296	$ 4,331	$ 3,108