Employee Benefit Plans, Shares Available For Grant (Details) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended
	May 31, 2011	May 31, 2010	Mar. 31, 2012
Shares Available For Grant
Options Granted, Number of Shares			(3.0)
Options Canceled, Number of Shares			0.5
Options Expired, Number of Shares			0.2
Common Stock, Capital Shares Reserved for Future Issuance			93.0
Employee Stock Purchase Plan [Member]
Shares Available For Grant
Common Stock, Capital Shares Reserved for Future Issuance			4.3
Restricted Stock Units and Performance Share Awards [Member]
Shares Available For Grant
Fair Market Value on Date of Grant For RSUS And PSAS Issued at Discount, Maximum Percentage			100.00%
Common Stock for Each Share Subject to RSUs and PSAs			2.1
Equity Incentive Plan 2006 [Member]
Shares Available For Grant
Beginning Balance, Number of Shares			41.1
Additional Authorized Share Reserve Approved By Shareholders	30.0	30.0
Awards Granted, Number of Shares			(18.3)	[1]
Options Granted, Number of Shares			(3.0)
Awards Canceled, Number of Shares			1.7	[1]
Options Canceled, Number of Shares			0.5	[2]
Options Expired, Number of Shares			0.2	[2]
Ending Balance, Number of Shares			22.2

[1] RSUs and PSAs with a per share or unit purchase price lower than 100% of the fair market value of the Company's common stock on the day of the grant under the 2006 Plan are counted against shares authorized under the plan as two and one-tenth shares of common stock for each share subject to such award. The number of shares subject to PSAs granted represents the maximum number of shares that may be issued pursuant to the award over its full term.

[2] Includes canceled or expired options under the 1996 Plan and the 2000 Plan that expired unexercised after May 18, 2006, which become available for grant under the 2006 Plan according to its terms.