Segment Information - Reportable Segments and Reconciliation to Consolidated Net Income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 60,453	$ 43,744	$ 37,955	$ 35,714	$ 43,741	$ 32,714	$ 30,404	$ 29,128	$ 177,866	$ 135,987	$ 107,006
Operating expenses									173,760	131,801	104,773
Operating income (loss)	2,127	347	628	1,005	1,255	575	1,285	1,071	4,106	4,186	2,233
Total non-operating income (expense)									(300)	(294)	(665)
Provision for income taxes	(16)	(58)	(467)	(229)	(414)	(229)	(307)	(475)	(769)	(1,425)	(950)
Equity-method investment activity, net of tax									(4)	(96)	(22)
Net income	$ 1,856	$ 256	$ 197	$ 724	$ 749	$ 252	$ 857	$ 513	3,033	2,371	596
North America
Segment Reporting Information [Line Items]
Net sales									106,110	79,785	63,708
Operating expenses									103,273	77,424	62,283
Operating income (loss)									2,837	2,361	1,425
International
Segment Reporting Information [Line Items]
Net sales									54,297	43,983	35,418
Operating expenses									57,359	45,266	36,117
Operating income (loss)									(3,062)	(1,283)	(699)
AWS
Segment Reporting Information [Line Items]
Net sales									17,459	12,219	7,880
Operating expenses									13,128	9,111	6,373
Operating income (loss)									$ 4,331	$ 3,108	$ 1,507