CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	$ 3,777	$ 3,444	$ 2,769
OPERATING ACTIVITIES:
Net income	631	1,152	902
Adjustments to reconcile net income to net cash from operating activities:
Depreciation of fixed assets, including internal-use software and website development, and other amortization	1,083	568	378
Stock-based compensation	557	424	341
Other operating expense (income), net	154	106	103
Losses (gains) on sales of marketable securities, net	(4)	(2)	(4)
Other expense (income), net	(56)	(79)	(15)
Deferred income taxes	136	4	81
Excess tax benefits from stock-based compensation	(62)	(259)	(105)
Changes in operating assets and liabilities:
Inventories	(1,777)	(1,019)	(531)
Accounts receivable, net and other	(866)	(295)	(481)
Accounts payable	2,997	2,373	1,859
Accrued expenses and other	1,067	740	300
Additions to unearned revenue	1,064	687	1,054
Amortization of previously unearned revenue	(1,021)	(905)	(589)
Net cash provided by operating activities	3,903	3,495	3,293
INVESTING ACTIVITIES:
Purchases of fixed assets, including internal-use software and website development	(1,811)	(979)	(373)
Acquisitions, net of cash acquired, and other	(705)	(352)	(40)
Sales and maturities of marketable securities and other investments	6,843	4,250	1,966
Purchases of marketable securities and other investments	(6,257)	(6,279)	(3,890)
Net cash used in investing activities	(1,930)	(3,360)	(2,337)
FINANCING ACTIVITIES:
Excess tax benefits from stock-based compensation	62	259	105
Common stock repurchased	(277)
Proceeds from long-term debt and other	177	143	87
Repayments of long-term debt, capital lease, and finance lease obligations	(444)	(221)	(472)
Net cash provided by (used in) financing activities	(482)	181	(280)
Foreign-currency effect on cash and cash equivalents	1	17	(1)
Net increase in cash and cash equivalents	1,492	333	675
CASH AND CASH EQUIVALENTS, END OF PERIOD	5,269	3,777	3,444
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest on long term debt	14	11	32
Cash paid for income taxes (net of refunds)	33	75	48
Assets Held under Capital Leases
SUPPLEMENTAL CASH FLOW INFORMATION:
Fixed assets acquired	753	405	147
Assets Held under Build-To-Suit Leases
SUPPLEMENTAL CASH FLOW INFORMATION:
Fixed assets acquired	$ 259	$ 172	$ 188