Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Net product sales	$ 24,745	$ 21,116	$ 48,479	$ 41,697
Net service sales	13,210	9,288	25,190	17,835
Total net sales	37,955	30,404	73,669	59,532
Operating expenses:
Cost of sales	23,451	19,180	45,891	38,047
Fulfillment	5,158	3,878	9,855	7,565
Marketing	2,229	1,546	4,150	2,982
Technology and content	5,549	3,880	10,363	7,405
General and administrative	874	580	1,669	1,077
Other operating expense, net	66	55	109	100
Total operating expenses	37,327	29,119	72,037	57,176
Operating income	628	1,285	1,632	2,356
Interest income	44	24	83	45
Interest expense	(143)	(116)	(282)	(233)
Other income (expense), net	137	(14)	185	66
Total non-operating income (expense)	38	(106)	(14)	(122)
Income before income taxes	666	1,179	1,618	2,234
Provision for income taxes	(467)	(307)	(695)	(782)
Equity-method investment activity, net of tax	(2)	(15)	(2)	(82)
Net income	$ 197	$ 857	$ 921	$ 1,370
Basic earnings per share (in usd per share)	$ 0.41	$ 1.81	$ 1.93	$ 2.90
Diluted earnings per share (in usd per share)	$ 0.40	$ 1.78	$ 1.87	$ 2.84
Weighted-average shares used in computation of earnings per share:
Basic (in shares)	479	473	478	472
Diluted (in shares)	492	483	491	482