Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net product sales	$ 31,864	$ 24,745	$ 63,468	$ 48,479
Net service sales	21,022	13,210	40,460	25,190
Total net sales	52,886	37,955	103,928	73,669
Operating expenses:
Cost of sales	30,632	23,451	61,367	45,891
Fulfillment	7,932	5,158	15,724	9,855
Marketing	2,901	2,229	5,600	4,150
Technology and content	7,247	5,549	14,006	10,363
General and administrative	1,111	874	2,177	1,669
Other operating expense, net	80	66	143	109
Total operating expenses	49,903	37,327	99,017	72,037
Operating income	2,983	628	4,911	1,632
Interest income	94	44	173	83
Interest expense	(343)	(143)	(673)	(282)
Other income (expense), net	(129)	137	109	185
Total non-operating income (expense)	(378)	38	(391)	(14)
Income before income taxes	2,605	666	4,520	1,618
Provision for income taxes	(74)	(467)	(361)	(695)
Equity-method investment activity, net of tax	3	(2)	4	(2)
Net income	$ 2,534	$ 197	$ 4,163	$ 921
Basic earnings per share	$ 5.21	$ 0.41	$ 8.58	$ 1.93
Diluted earnings per share	$ 5.07	$ 0.40	$ 8.34	$ 1.87
Weighted-average shares used in computation of earnings per share:
Basic (in shares)	486	479	485	478
Diluted (in shares)	500	492	499	491