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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities    
Net income $ 48 $ 471
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 249 123
Loss on write-off of equipment 4 6
Share-based compensation 1,209 71
Deferred income taxes (374) (14)
Tax benefit from share-based award activity 381 355
Excess tax benefit from share-based award activity (381) (355)
Changes in assets and liabilities    
Accounts receivable (41) (28)
Income tax refundable (567) 0
Prepaid expenses and other current assets (7) (226)
Other assets (43) (6)
Accounts payable (8) 7
Platform partners payable (15) 38
Accrued expenses and other current liabilities 226 (21)
Deferred revenue and deposits (5) 20
Other liabilities 7 33
Net cash provided by operating activities 683 474
Cash flows from investing activities    
Purchases of property and equipment (866) (285)
Purchases of marketable securities (6,957) (1,892)
Sales of marketable securities 128 0
Maturities of marketable securities 1,106 0
Investments in non-marketable equity securities (3) (1)
Acquisitions of businesses, net of cash acquired, and purchases of intangible and other assets (575) (4)
Change in restricted cash and deposits (3) (3)
Net cash used in investing activities (7,170) (2,185)
Cash flows from financing activities    
Net proceeds from issuance of common stock 6,761 998
Proceeds from exercise of stock options 9 24
Repayment of long term debt 0 (250)
Proceeds from sale and lease-back transactions 82 8
Principal payments on capital lease obligations (143) (82)
Excess tax benefit from share-based award activity 381 355
Net cash provided by financing activities 7,090 1,053
Effect of exchange rate changes on cash and cash equivalents (17) 4
Net increase (decrease) in cash and cash equivalents 586 (654)
Cash and cash equivalents at beginning of period 1,512 1,785
Cash and cash equivalents at end of period 2,098 1,131
Cash paid during the period for:    
Interest 19 13
Income taxes 182 176
Non-cash investing and financing activities:    
Fair value of shares issued related to acquisitions of businesses and other assets 25 44
Net change in accounts payable and accrued expenses and other liabilities
    
Non-cash investing and financing activities:    
Property and equipment expenditures incurred but not yet paid (59) 56
Capital Lease Obligations
    
Non-cash investing and financing activities:    
Property and equipment expenditures incurred but not yet paid $ 90 $ 291