Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net product sales	$ 28,768	$ 22,339	$ 77,248	$ 64,036
Net service sales	14,976	10,375	40,165	28,210
Total net sales	43,744	32,714	117,413	92,246
Operating expenses:
Cost of sales	27,549	21,260	73,439	59,306
Fulfillment	6,420	4,335	16,275	11,900
Marketing	2,479	1,738	6,629	4,720
Technology and content	5,944	4,135	16,306	11,541
General and administrative	960	639	2,630	1,715
Other operating expense, net	45	32	155	133
Total operating expenses	43,397	32,139	115,434	89,315
Operating income	347	575	1,979	2,931
Interest income	54	26	137	71
Interest expense	(228)	(118)	(510)	(351)
Other income (expense), net	143	8	329	75
Total non-operating income (expense)	(31)	(84)	(44)	(205)
Income before income taxes	316	491	1,935	2,726
Provision for income taxes	(58)	(229)	(755)	(1,012)
Equity-method investment activity, net of tax	(2)	(10)	(4)	(92)
Net income	$ 256	$ 252	$ 1,176	$ 1,622
Basic earnings per share (in usd per share)	$ 0.53	$ 0.53	$ 2.46	$ 3.43
Diluted earnings per share (in usd per share)	$ 0.52	$ 0.52	$ 2.39	$ 3.36
Weighted-average shares used in computation of earnings per share:
Basic (in shares)	481	474	479	473
Diluted (in shares)	494	485	492	483