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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD $ 5,269 $ 3,777 $ 3,444
OPERATING ACTIVITIES:      
Net income (loss) (39) 631 1,152
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 2,159 1,083 568
Stock-based compensation 833 557 424
Other operating expense (income), net 154 154 106
Losses (gains) on sales of marketable securities, net (9) (4) (2)
Other expense (income), net 253 (56) (79)
Deferred income taxes (265) 136 4
Excess tax benefits from stock-based compensation (429) (62) (259)
Changes in operating assets and liabilities:      
Inventories (999) (1,777) (1,019)
Accounts receivable, net and other (861) (866) (295)
Accounts payable 2,070 2,997 2,373
Accrued expenses and other 1,038 1,067 740
Additions to unearned revenue 1,796 1,064 687
Amortization of previously unearned revenue (1,521) (1,021) (905)
Net cash provided by (used in) operating activities 4,180 3,903 3,495
INVESTING ACTIVITIES:      
Purchases of property and equipment, including internal-use software and website development (3,785) (1,811) (979)
Acquisitions, net of cash acquired, and other (745) (705) (352)
Sales and maturities of marketable securities and other investments 4,237 6,843 4,250
Purchases of marketable securities and other investments (3,302) (6,257) (6,279)
Net cash provided by (used in) investing activities (3,595) (1,930) (3,360)
FINANCING ACTIVITIES:      
Excess tax benefits from stock-based compensation 429 62 259
Common stock repurchased (960) (277)  
Proceeds from long-term debt and other 3,378 177 143
Repayments of long-term debt, capital lease, and finance lease obligations (588) (444) (221)
Net cash provided by (used in) financing activities 2,259 (482) 181
Foreign-currency effect on cash and cash equivalents (29) 1 17
Net increase (decrease) in cash and cash equivalents 2,815 1,492 333
CASH AND CASH EQUIVALENTS, END OF PERIOD 8,084 5,269 3,777
SUPPLEMENTAL CASH FLOW INFORMATION:      
Cash paid for interest on long-term debt 31 14 11
Cash paid for income taxes (net of refunds) 112 33 75
Assets Held under Capital Leases
      
SUPPLEMENTAL CASH FLOW INFORMATION:      
Property and equipment acquired 802 753 405
Assets Held under Build-To-Suit Leases
      
SUPPLEMENTAL CASH FLOW INFORMATION:      
Property and equipment acquired $ 29 $ 259 $ 172