Employee Benefit Plans (Details) (USD $)	3 Months Ended	9 Months Ended		1 Months Ended			9 Months Ended					9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2012 Employee Stock Purchase Plan 2008 [Member]	May 31, 2012 Equity Incentive Plan 2006 [Member]	May 31, 2011 Equity Incentive Plan 2006 [Member]	May 31, 2010 Equity Incentive Plan 2006 [Member]	Sep. 30, 2012 Equity Incentive Plan 2006 [Member]		Dec. 31, 2011 Equity Incentive Plan 2006 [Member]	May 31, 2006 Equity Incentive Plan 2006 [Member]	May 31, 2006 Plan 1996 and 2000 [Member]	Sep. 30, 2012 Stock Options [Member] From 2006 [Member]	Sep. 30, 2012 Stock Options [Member] Prior to 2006 [Member]
Share-Based Compensation Plans
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price			15.00%
Periodic Payroll Deduction - Percentage of Base Salary			10.00%
Maximum Purchase of Common Stock, Shares			6,000
Share-based Compensation Arrangement by Share-based Payment Award, Offering Period			12 months
Maximum Purchase of Common Stock, Value			$ 25,000
Number of Shares in Authorized										64,500,000
Maximum Additional Shares Expire Unexercised, Under 1996 and 2000 Plan											75,000,000
Additional Authorized Share Reserve Approved By Shareholders				25,000,000	30,000,000	30,000,000
Number of Shares Outstanding							59,000,000
Number of Shares Available for Future Issuance							50,200,000		41,100,000
Outstanding Stock Options and RSU's from Awards Assumed	1,200,000	1,200,000
Share Based Compensation Arrangement By Share Based Payment Award, Contractual Life, Maximum		1 year										7 years	10 years
Stock Option Activities
Beginning Balance, Number of Shares		38,600,000
Options Granted, Number of Shares		3,100,000					3,100,000
Options Canceled, Number of Shares		(2,100,000)					(2,100,000)	[1]
Options Exercised, Number of Shares		(2,800,000)
Options Expired, Number of Shares		(1,100,000)					(1,100,000)	[1]
Ending Balance, Number of Shares	35,700,000	35,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Beginning Balance, Weighted Average Exercise Price		$ 23.98
Options Granted, Weighted Average Exercise Price		$ 22.81
Options Canceled, Weighted Average Exercise Price		$ 25.61
Options Exercised, Weighted Average Exercise Price		$ 10.84
Options Expired, Weighted Average Exercise Price		$ 26.97
Ending Balance, Weighted Average Exercise Price	$ 24.73	$ 24.73
Weighted Average Remaining Contractual Term at Period End		3 years 2 months
Aggregate Intrinsic Value at Period End	17,200,000	17,200,000
Vested or Expected-to-Vest Options, Number of Shares at Period End	34,600,000	34,600,000
Vested or Expected-to-Vest Options, Weighted Average Exercise Price at Period End	$ 24.58	$ 24.58
Vested and Expected-to-Vest Options, Weighted Average Remaining Contractual Term at Period End		3 years 2 months
Vested or Expected-to-Vest Options, Aggregate Intrinsic Value at Period End	17,100,000	17,100,000
Exercisable Options, Number of Shares at Period End	27,400,000	27,400,000
Exercisable Options, Weighted Average Exercise Price at Period End	$ 23.59	$ 23.59
Exercisable Options, Weighted Average Remaining Contractual Term at Period End		2 years 7 months
Exercisable Options, Aggregate Intrinsic Value at Period End	15,400,000	15,400,000
Share Price	$ 17.11	$ 17.11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	1,600,000	24,800,000
Total Fair Value of Options Vested	$ 14,200,000	$ 57,100,000

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