Segment Information Reportable Segments and Reconciliation to Consolidated Net Income (Detail) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Segment	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Segment Reporting Disclosure [Line Items]
Number of Reportable Segments | Segment			3
Net sales	$ 32,714	$ 25,358	$ 92,246	$ 71,259
Operating expenses	32,139	24,952	89,315	70,135
Operating income	575	406	2,931	1,124
Total non-operating income (expense)	(84)	(159)	(205)	(494)
Provision for income taxes	(229)	(161)	(1,012)	(498)
Equity-method investment activity, net of tax	(10)	(7)	(92)	(18)
Net income	252	79	1,622	114	$ 2,105	$ 328
Operating Segments
Segment Reporting Disclosure [Line Items]
Net sales	32,714	25,358	92,246	71,259
Operating expenses	31,331	24,365	87,094	68,486
Operating income before stock-based compensation and other	1,383	993	5,152	2,773
Stock-based compensation and other	808	587	2,221	1,649
North America | Operating Segments
Segment Reporting Disclosure [Line Items]
Net sales	18,874	15,006	53,544	42,208
Operating expenses	18,180	14,478	50,769	40,461
Operating income before stock-based compensation and other	694	528	2,775	1,747
Stock-based compensation and other	439	342	1,230	959
Operating income	255	186	1,545	788
International | Operating Segments
Segment Reporting Disclosure [Line Items]
Net sales	10,609	8,267	30,019	23,577
Operating expenses	10,941	8,323	30,242	23,728
Operating income before stock-based compensation and other	(332)	(56)	(223)	(151)
Stock-based compensation and other	209	152	573	440
Operating income	(541)	(208)	(796)	(591)
AWS | Operating Segments
Segment Reporting Disclosure [Line Items]
Net sales	3,231	2,085	8,683	5,474
Operating expenses	2,210	1,564	6,083	4,297
Operating income before stock-based compensation and other	1,021	521	2,600	1,177
Stock-based compensation and other	160	93	418	250
Operating income	$ 861	$ 428	$ 2,182	$ 927