Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net product sales	$ 31,605	$ 23,734
Net service sales	19,437	11,980
Total net sales	51,042	35,714
Operating expenses:
Cost of sales	30,735	22,440
Fulfillment	7,792	4,697
Marketing	2,699	1,920
Technology and content	6,759	4,813
General and administrative	1,067	795
Other operating expense, net	63	44
Total operating expenses	49,115	34,709
Operating income	1,927	1,005
Interest income	80	39
Interest expense	(330)	(139)
Other income (expense), net	239	48
Total non-operating income (expense)	(11)	(52)
Income before income taxes	1,916	953
Provision for income taxes	(287)	(229)
Net income	$ 1,629	$ 724
Basic earnings per share	$ 3.36	$ 1.52
Diluted earnings per share	$ 3.27	$ 1.48
Weighted-average shares used in computation of earnings per share:
Basic (in shares)	484	477
Diluted (in shares)	498	490