CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities
Net income	$ 53	$ 1,000	$ 606
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	649	323	139
Loss on write-off of equipment	15	4	3
Share-based compensation	1,572	217	20
Deferred income taxes	(186)	(30)	23
Tax benefit from share-based award activity	1,033	433	115
Excess tax benefit from share-based award activity	(1,033)	(433)	(115)
Changes in assets and liabilities:
Accounts receivable	(170)	(174)	(209)
Income tax refundable	(451)	0	0
Prepaid expenses and other current assets	(14)	(24)	(38)
Other assets	2	(5)	(6)
Accounts payable	1	6	12
Platform partners payable	(2)	96	75
Accrued expenses and other current liabilities	160	37	20
Deferred revenue and deposits	(60)	49	37
Other liabilities	43	50	16
Net cash provided by operating activities	1,612	1,549	698
Cash flows from investing activities
Purchases of property and equipment	(1,235)	(606)	(293)
Purchases of marketable securities	(10,307)	(3,025)	0
Sales of marketable securities	2,100	113	0
Maturities of marketable securities	3,333	516	0
Investments in non-marketable equity securities	(2)	(3)	0
Acquisitions of businesses, net of cash acquired, and purchases of intangible and other assets	(911)	(24)	(22)
Change in restricted cash and deposits	(2)	6	(9)
Net cash used in investing activities	(7,024)	(3,023)	(324)
Cash flows from financing activities
Net proceeds from issuance of common stock	6,760	998	500
Taxes paid related to net share settlement of equity awards	(2,862)	0	0
Proceeds from exercise of stock options	17	28	6
Proceeds from long-term debt, net of issuance cost	1,496	0	250
Repayments of long-term debt	0	(250)	0
Proceeds from sale and lease-back transactions	205	170	0
Principal payments on capital lease obligations	(366)	(181)	(90)
Excess tax benefit from share-based award activity	1,033	433	115
Net cash provided by financing activities	6,283	1,198	781
Effect of exchange rate changes on cash and cash equivalents	1	3	(3)
Net increase (decrease) in cash and cash equivalents	872	(273)	1,152
Cash and cash equivalents at beginning of period	1,512	1,785	633
Cash and cash equivalents at end of period	2,384	1,512	1,785
Cash paid during the period for:
Interest	38	28	23
Income taxes, net	53	197	261
Non-cash investing and financing activities:
Fair value of shares issued related to acquisitions of businesses and other assets	274	58	60
Net change in accounts payable and accrued expenses and other liabilities
Non-cash investing and financing activities:
Capital expenditures incurred but not yet paid	(40)	135	47
Capital Lease Obligations
Non-cash investing and financing activities:
Capital expenditures incurred but not yet paid	$ 340	$ 473	$ 217