Consolidated Statements Of Cash Flows - 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
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	$ 10,269	$ 5,057	$ 14,557	$ 8,658	$ 5,258	$ 3,872
OPERATING ACTIVITIES:
Net income (loss)	79	(437)	114	(455)	328	(216)
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation of property and equipment, including internal-use software and website development, and other amortization, including capitalized content costs	1,599	1,247	4,529	3,366	5,908	4,329
Stock-based compensation	544	377	1,513	1,089	1,921	1,414
Other operating expense (income), net	34	31	120	93	156	133
Losses (gains) on sales of marketable securities, net	2	(3)	4	(4)	4	(3)
Other expense (income), net	56	42	166	(16)	244	36
Deferred income taxes	(63)	(270)	(108)	(503)	76	(613)
Excess tax benefits from stock-based compensation	(95)	0	(212)	(121)	(96)	(199)
Changes in operating assets and liabilities:
Inventories	(1,537)	(845)	(844)	(54)	(1,983)	(1,383)
Accounts receivable, net and other	(588)	(362)	(577)	66	(1,681)	(1,173)
Accounts payable	2,030	1,724	(1,846)	(3,294)	3,207	1,834
Accrued expenses and other	143	4	(925)	(742)	525	847
Additions to unearned revenue	1,779	1,069	4,979	3,055	6,358	3,874
Amortization of previously unearned revenue	(1,373)	(811)	(3,805)	(2,353)	(5,144)	(3,175)
Net cash provided by (used in) operating activities	2,610	1,766	3,108	127	9,823	5,705
INVESTING ACTIVITIES:
Purchases of property and equipment, including internal-use software and website development	(1,195)	(1,378)	(3,280)	(3,748)	(4,424)	(4,628)
Acquisitions, net of cash acquired, and other	(105)	(860)	(478)	(926)	(531)	(986)
Sales and maturities of marketable securities	1,045	1,439	1,890	2,994	2,244	3,509
Purchases of marketable securities	(1,122)	(147)	(2,732)	(920)	(4,354)	(1,339)
Net cash provided by (used in) investing activities	(1,377)	(946)	(4,600)	(2,600)	(7,065)	(3,444)
FINANCING ACTIVITIES:
Excess tax benefits from stock-based compensation	95	0	212	121	96	199
Proceeds from long-term debt and other	33	28	260	379	6,241	628
Repayments of long-term debt and other	(181)	(84)	(712)	(331)	(894)	(371)
Principal repayments of capital lease obligations	(656)	(343)	(1,738)	(878)	(2,144)	(1,103)
Principal repayments of finance lease obligations	(21)	(13)	(95)	(68)	(163)	(73)
Net cash provided by (used in) financing activities	(730)	(412)	(2,073)	(777)	3,136	(720)
Foreign-currency effect on cash and cash equivalents	(63)	(207)	(283)	(150)	(443)	(155)
Net increase (decrease) in cash and cash equivalents	440	201	(3,848)	(3,400)	5,451	1,386
CASH AND CASH EQUIVALENTS, END OF PERIOD	10,709	5,258	10,709	5,258	10,709	5,258
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest on long-term debt	7	7	177	56	212	93
Cash paid for income taxes (net of refunds)	80	38	200	148	230	173
Assets Held under Capital Leases
SUPPLEMENTAL CASH FLOW INFORMATION:
Property and equipment acquired	1,047	1,158	3,385	2,794	4,599	3,347
Assets Held under Build-To-Suit Leases
SUPPLEMENTAL CASH FLOW INFORMATION:
Property and equipment acquired	$ 125	$ 343	$ 381	$ 707	$ 595	$ 920