Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating activities:
Net income	$ 368	$ 366
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	159	164
Stock-based compensation	242	267
Excess tax benefits from stock-based compensation	(26)	(26)
Deferred income taxes, net	(22)	(79)
Other	(1)	2
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	305	130
Other assets	(13)	(43)
Due to/from related parties, net	63	(33)
Accounts payable	(33)	(8)
Accrued expenses	27	56
Income taxes payable	(49)	112
Unearned revenues	(21)	251
Net cash provided by operating activities	999	1,159
Investing activities:
Additions to property and equipment	(184)	(153)
Purchases of available-for-sale securities	(2,095)	(1,976)
Sales of available-for-sale securities	1,373	941
Maturities of available-for-sale securities	524	322
Purchases of strategic investments	(4)	(40)
Business acquisitions, net of cash acquired	(21)	(1,068)
Decrease (increase) in restricted cash	1	(76)
Other investing	2	(10)
Net cash used in investing activities	(404)	(2,060)
Financing activities:
Proceeds from issuance of common stock	69	99
Proceeds from issuance of notes payable to EMC	0	1,050
Reduction in capital from EMC	0	(24)
Proceeds from non-controlling interests	4	0
Repurchase of common stock	(850)	(407)
Excess tax benefits from stock-based compensation	26	26
Shares repurchased for tax withholdings on vesting of restricted stock	(124)	(94)
Net cash provided by (used in) financing activities	(875)	650
Net decrease in cash and cash equivalents	(280)	(251)
Cash and cash equivalents at beginning of the period	2,071	2,305
Cash and cash equivalents at end of the period	1,791	2,054
Supplemental disclosures of cash flow information:
Cash paid for interest	14	13
Cash paid for taxes, net	136	46
Non-cash items:
Changes in capital additions, accrued but not paid	(22)	11
Fair value of stock-based awards assumed in acquisition	$ 0	$ 24