CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities
Net income	$ 642	$ 219
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	264	233
Lease abandonment	(13)	8
Share-based compensation	274	170
Deferred income taxes	(1)	(7)
Tax benefit from share-based award activity	345	59
Excess tax benefit from share-based award activity	(348)	(62)
Other	9	9
Changes in assets and liabilities:
Accounts receivable	105	54
Prepaid expenses and other current assets	(4)	(1)
Other assets	16	(36)
Accounts payable	(10)	1
Developer partners payable	7	21
Accrued expenses and other current liabilities	(27)	(33)
Other liabilities	26	84
Net cash provided by operating activities	1,285	719
Cash flows from investing activities
Purchases of property and equipment	(363)	(327)
Purchases of marketable securities	(2,974)	(1,508)
Sales of marketable securities	847	699
Maturities of marketable securities	619	903
Acquisitions of businesses, net of cash acquired, and purchases of intangible assets	0	(99)
Other investing activities, net	(1)	6
Net cash used in investing activities	(1,872)	(326)
Cash flows from financing activities
Taxes paid related to net share settlement of equity awards	(3)	(405)
Proceeds from exercise of stock options	1	8
Principal payments on capital lease obligations	(84)	(109)
Excess tax benefit from share-based award activity	348	62
Net cash provided by (used in) financing activities	262	(444)
Effect of exchange rate changes on cash and cash equivalents	0	(8)
Net decrease in cash and cash equivalents	(325)	(59)
Cash and cash equivalents at beginning of period	3,323	2,384
Cash and cash equivalents at end of period	2,998	2,325
Cash paid during the period for:
Interest	4	12
Income taxes	37	9
Non-cash investing and financing activities:
Fair value of shares issued related to acquisitions of businesses and other assets	0	33
Net Change in Accounts Payable Accrued Expenses And Other Current Liabilities
Non-cash investing and financing activities:
Property and equipment expenditures incurred but not yet paid	(3)	47
Capital Lease Obligations
Non-cash investing and financing activities:
Property and equipment expenditures incurred but not yet paid	$ 0	$ 11