Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	$ 5,057	$ 3,704	$ 8,658	$ 8,084	$ 3,872	$ 2,980
OPERATING ACTIVITIES:
Net income (loss)	(437)	(41)	(455)	34	(216)	132
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	1,247	834	3,366	2,291	4,329	2,953
Stock-based compensation	377	281	1,089	808	1,414	1,043
Other operating expense (income), net	31	11	93	74	133	110
Losses (gains) on sales of marketable securities, net	(3)	1	(4)	1	(3)	0
Other expense (income), net	42	5	(16)	115	36	214
Deferred income taxes	(270)	11	(503)	(47)	(613)	(195)
Excess tax benefits from stock-based compensation	0	0	(121)	0	(199)	(239)
Changes in operating assets and liabilities:
Inventories	(845)	(586)	(54)	(80)	(1,383)	(1,054)
Accounts receivable, net and other	(362)	(125)	66	393	(1,173)	(632)
Accounts payable	1,724	947	(3,294)	(3,240)	1,834	1,686
Accrued expenses and other	4	(72)	(742)	(853)	847	558
Additions to unearned revenue	1,069	672	3,055	1,872	3,874	2,417
Amortization of previously unearned revenue	(811)	(550)	(2,353)	(1,471)	(3,175)	(2,016)
Net cash provided by (used in) operating activities	1,766	1,388	127	(103)	5,705	4,977
INVESTING ACTIVITIES:
Purchases of property and equipment, including internal-use software and website development	(1,378)	(1,038)	(3,748)	(2,565)	(4,628)	(4,589)
Acquisitions, net of cash acquired, and other	(860)	(1)	(926)	(252)	(986)	(287)
Sales and maturities of marketable securities and other investments	1,439	494	2,994	1,791	3,509	2,296
Purchases of marketable securities and other investments	(147)	(518)	(920)	(2,406)	(1,339)	(3,934)
Net cash provided by (used in) investing activities	(946)	(1,063)	(2,600)	(3,432)	(3,444)	(6,514)
FINANCING ACTIVITIES:
Excess tax benefits from stock-based compensation	0	0	121	0	199	239
Proceeds from long-term debt and other	28	25	379	132	628	3,189
Repayments of long-term debt, capital lease, and finance lease obligations	(440)	(255)	(1,277)	(728)	(1,547)	(858)
Net cash provided by (used in) financing activities	(412)	(230)	(777)	(596)	(720)	2,570
Foreign-currency effect on cash and cash equivalents	(207)	73	(150)	(81)	(155)	(141)
Net increase (decrease) in cash and cash equivalents	201	168	(3,400)	(4,212)	1,386	892
CASH AND CASH EQUIVALENTS, END OF PERIOD	5,258	3,872	5,258	3,872	5,258	3,872
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest on long-term debt	7	8	56	60	93	70
Cash paid for income taxes (net of refunds)	38	23	148	143	173	195
Assets Held under Capital Leases
SUPPLEMENTAL CASH FLOW INFORMATION:
Property and equipment acquired	1,158	526	2,794	1,313	3,347	1,552
Assets Held under Build-To-Suit Leases
SUPPLEMENTAL CASH FLOW INFORMATION:
Property and equipment acquired	$ 343	$ 269	$ 707	$ 663	$ 920	$ 647