Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	$ 3,704	$ 2,335	$ 8,084	$ 5,269	$ 2,980	$ 2,823
OPERATING ACTIVITIES:
Net income (loss)	(41)	(274)	34	(137)	132	40
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	834	554	2,291	1,497	2,953	1,856
Stock-based compensation	281	217	808	597	1,043	756
Other operating expense (income), net	11	40	74	118	110	161
Losses (gains) on sales of marketable securities, net	1	(4)	1	(8)	0	(8)
Other expense (income), net	5	157	115	153	214	137
Deferred income taxes	11	(36)	(47)	(117)	(195)	(50)
Excess tax benefits from stock-based compensation	0	(66)	0	(190)	(239)	(191)
Changes in operating assets and liabilities:
Inventories	(586)	(647)	(80)	(25)	(1,054)	(1,285)
Accounts receivable, net and other	(125)	(416)	393	164	(632)	(913)
Accounts payable	947	1,223	(3,240)	(2,856)	1,686	1,828
Accrued expenses and other	(72)	96	(853)	(373)	558	703
Additions to unearned revenue	672	472	1,872	1,251	2,417	1,609
Amortization of previously unearned revenue	(550)	(373)	(1,471)	(975)	(2,016)	(1,275)
Net cash provided by (used in) operating activities	1,388	943	(103)	(901)	4,977	3,368
INVESTING ACTIVITIES:
Purchases of property and equipment, including internal-use software and website development	(1,038)	(716)	(2,565)	(1,759)	(4,589)	(2,310)
Acquisitions, net of cash acquired, and other	(1)	(37)	(252)	(711)	(287)	(759)
Sales and maturities of marketable securities and other investments	494	742	1,791	3,731	2,296	4,643
Purchases of marketable securities and other investments	(518)	(358)	(2,406)	(1,774)	(3,934)	(3,556)
Net cash provided by (used in) investing activities	(1,063)	(369)	(3,432)	(513)	(6,514)	(1,982)
FINANCING ACTIVITIES:
Excess tax benefits from stock-based compensation	0	66	0	190	239	191
Common stock repurchased	0	0	0	(960)	0	(1,237)
Proceeds from long-term debt and other	25	109	132	300	3,189	343
Repayments of long-term debt, capital lease, and finance lease obligations	(255)	(144)	(728)	(437)	(858)	(537)
Net cash provided by (used in) financing activities	(230)	31	(596)	(907)	2,570	(1,240)
Foreign-currency effect on cash and cash equivalents	73	40	(81)	32	(141)	11
Net increase (decrease) in cash and cash equivalents	168	645	(4,212)	(2,289)	892	157
CASH AND CASH EQUIVALENTS, END OF PERIOD	3,872	2,980	3,872	2,980	3,872	2,980
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest on long-term debt	8	7	60	21	70	25
Cash paid for income taxes (net of refunds)	23	21	143	60	195	75
Assets Held under Capital Leases
SUPPLEMENTAL CASH FLOW INFORMATION:
Property and equipment acquired	526	207	1,313	564	1,552	751
Assets Held under Build-To-Suit Leases
SUPPLEMENTAL CASH FLOW INFORMATION:
Property and equipment acquired	$ 269	$ 14	$ 663	$ 46	$ 647	$ 85