Segment Information Reportable Segments and Reconciliation to Consolidated Net Income (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Disclosure [Line Items]
Net sales		$ 25,358	$ 20,579	$ 71,259	$ 59,659
Segment operating expenses		24,952	21,123	70,135	60,071
Income (loss) from operations		406	(544)	1,124	(412)
Stock-based compensation		(544)	(377)	(1,513)	(1,089)	$ (1,921)	$ (1,414)
Other operating income (expense), net		(43)	(31)	(136)	(94)
Total non-operating income (expense)		(159)	(90)	(494)	(128)
Benefit (provision) for income taxes		(161)	205	(498)	38
Equity-method investment activity, net of tax		(7)	(8)	(18)	47
Net income (loss)		79	(437)	114	(455)	$ 328	$ (216)
Operating Segments
Segment Reporting Disclosure [Line Items]
Net sales		25,358	20,579	71,259	59,659
Segment operating expenses	[1]	24,365	20,715	68,486	58,888
Income (loss) from operations		993	(136)	2,773	771
North America | Operating Segments
Segment Reporting Disclosure [Line Items]
Net sales		15,006	11,699	42,208	33,499
Segment operating expenses	[1]	14,478	11,759	40,461	32,940
Income (loss) from operations		528	(60)	1,747	559
International | Operating Segments
Segment Reporting Disclosure [Line Items]
Net sales		8,267	7,711	23,577	22,936
Segment operating expenses	[1]	8,323	7,885	23,728	23,144
Income (loss) from operations		(56)	(174)	(151)	(208)
AWS | Operating Segments
Segment Reporting Disclosure [Line Items]
Net sales		2,085	1,169	5,474	3,224
Segment operating expenses	[1]	1,564	1,071	4,297	2,804
Income (loss) from operations		521	98	1,177	420
AWS
Segment Reporting Disclosure [Line Items]
Net sales		$ 2,085	$ 1,169	$ 5,474	$ 3,224

[1] Excludes stock-based compensation and “Other operating expense (income), net” which are not allocated to segments.