Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Operating activities:
Net income	$ 191,729	$ 220,158	$ 383,165	$ 345,970
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	89,392	74,709	175,158	155,658
Stock-based compensation, excluding amounts capitalized	100,900	85,442	182,706	166,015
Excess tax benefits from stock-based compensation	(32,701)	(101,256)	(86,383)	(151,264)
Gain on sale of Terremark investment	0	(56,000)	0	(56,000)
Other	373	2,864	(555)	3,826
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	(91,296)	(54,757)	135,254	26,583
Other assets	(69,444)	(16,133)	(117,150)	(34,053)
Due to/from EMC, net	(43,403)	(35,265)	12,145	25,435
Accounts payable	4,894	(11,105)	17,419	(1,707)
Accrued expenses	95,753	102,780	936	34,211
Income taxes receivable from EMC	0	141,000	0	176,444
Income taxes payable	12,367	4,674	67,733	37,601
Deferred income taxes, net	(1,416)	11,119	(36,371)	(958)
Unearned revenue	134,177	94,566	233,872	212,952
Net cash provided by operating activities	391,325	462,796	967,929	940,713
Investing activities:
Additions to property and equipment	(44,336)	(95,186)	(78,007)	(122,232)
Capitalized software development costs	0	(25,437)	0	(52,859)
Purchases of available-for-sale securities	(1,253,605)	(529,038)	(1,955,068)	(1,127,805)
Sales of available-for-sale securities	348,437	223,491	770,754	376,588
Maturities of available-for-sale securities	277,099	277,390	534,076	492,969
Sale of strategic investments	0	76,000	0	78,513
Business acquisitions, net of cash acquired	(102,166)	(189,138)	(102,166)	(204,088)
Transfer of net assets under common control	0	(7,973)	0	(20,463)
Other investing	(2,677)	31,858	(4,174)	(27,142)
Net cash used in investing activities	(777,248)	(411,159)	(834,585)	(779,645)
Financing activities:
Proceeds from issuance of common stock	33,554	110,543	144,595	200,714
Repurchase of common stock	(178,195)	(132,660)	(178,195)	(280,389)
Excess tax benefits from stock-based compensation	32,701	101,256	86,383	151,264
Shares repurchased for tax withholdings on vesting of restricted stock	(51,346)	(48,666)	(64,983)	(70,578)
Net cash provided by (used in) financing activities	(163,286)	30,473	(12,200)	1,011
Net increase (decrease) in cash and cash equivalents	(549,209)	82,110	121,144	162,079
Cash and cash equivalents at beginning of the period	2,626,109	1,708,934	1,955,756	1,628,965
Cash and cash equivalents at end of the period	2,076,900	1,791,044	2,076,900	1,791,044
Non-cash items:
Changes in capital additions, accrued but not paid	17,980	(985)	15,330	6,221
Change In tax withholdings on vesting of restricted stock, accrued but not paid	6,029	3,656	6,837	2,938
Lease Agreements [Member]
Investing activities:
Purchase of leasehold interest (see Note H)	$ 0	$ (173,126)	$ 0	$ (173,126)