Employee Benefit Plans (Details) (USD $)	12 Months Ended							1 Months Ended			12 Months Ended				36 Months Ended	1 Months Ended	12 Months Ended			12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010		Dec. 31, 2009	Dec. 31, 2012 Business Acquisition Acquired Entity Contrail [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]	Dec. 31, 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]	Dec. 31, 2012 Assumed Plans [Member]	May 31, 2012 Employee Stock Purchase Plan 2008 [Member]	Dec. 31, 2012 Employee Stock Purchase Plan 2008 [Member]	May 31, 2008 Employee Stock Purchase Plan 2008 [Member]	Dec. 31, 2012 Stock Compensation Plan [Member]	Dec. 31, 2012 Stock Options [Member] Prior to 2006 [Member]	Dec. 31, 2012 Stock Options [Member] Equity Incentive Plan 2006 [Member]	Dec. 31, 2012 RSUs and PSAs [Member] Equity Incentive Plan 2006 [Member]
Share-Based Compensation Plans
Common Stock, Capital Shares Reserved for Future Issuance																		12,000,000	125,100,000
Number of Shares in Authorized													64,500,000
Maximum Additional Shares Expire Unexercised, Under 1996 and 2000 Plan														75,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized								25,000,000	30,000,000	30,000,000	25,000,000					7,000,000
Number of Shares Outstanding											54,200,000
Number of Shares Available for Future Issuance											54,300,000	41,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																	1 year			10 years	7 years
Share-based Compensation Arrangement by Share-based Payment Award, Vest Period																					4 years
Shared-based Compensation Arrangement Based Solely on Continuing Employment, Vest Period																						3 years
Shared-based Compensation Arrangement. Other Than Based on Continuing Employment, Vest Period																						1 year
Share-based Compensation Arrangement by Share-based Payment Award, Shares Registered for Award															1,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Assumed Awards							6,800,000
Outstanding Stock Options and RSU's from Awards Assumed	7,200,000
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
Stock Option Activities
Beginning Balance, Number of Shares	38,600,000		49,400,000	67,400,000
Options Granted, Number of Shares	3,100,000		5,600,000	6,200,000							3,100,000
Options Assumed, Number of Shares	900,000	[1]		500,000	[2]
Options Canceled, Number of Shares	(2,800,000)		(1,900,000)	(2,300,000)							(2,800,000)
Options Exercised, Number of Shares	(3,600,000)		(13,900,000)	(21,600,000)
Options Expired, Number of Shares	(2,100,000)		(600,000)	(800,000)							(2,100,000)
Ending Balance, Number of Shares	34,100,000		38,600,000	49,400,000		67,400,000
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		$ 21.90	$ 20.84
Options Granted, Weighted Average Exercise Price	$ 22.81		$ 37.17	$ 29.15
Options Assumed, Weighted Average Exercise Price	$ 0.57	[1]		$ 31.65	[2]
Options Canceled, Weighted Average Exercise Price	$ 26.64		$ 26.76	$ 22.03
Options Exercised, Weighted Average Exercise Price	$ 11.71		$ 21.13	$ 18.99
Options Expired, Weighted Average Exercise Price	$ 26.97		$ 34.32	$ 61.48
Ending Balance, Weighted Average Exercise Price	$ 24.13		$ 23.98	$ 21.90		$ 20.84
Weighted Average Remaining Contractual Term at Period End	3 years 1 month		3 years 8 months	4 years 1 month		4 years 7 months
Aggregate Intrinsic Value at Period End	52,500,000		75,300,000	744,500,000		451,200,000
Vested or Expected-to-Vest Options, Number of Shares at Period End	33,000,000
Vested or Expected-to-Vest Options, Weighted Average Exercise Price at Period End	$ 24.14
Vested and Expected-to-Vest Options, Weighted Average Remaining Contractual Term at Period End	3 years
Vested or Expected-to-Vest Options, Aggregate Intrinsic Value at Period End	48,400,000
Exercisable Options, Number of Shares at Period End	26,800,000		26,100,000	32,100,000
Exercisable Options, Weighted Average Exercise Price at Period End	$ 23.77		$ 21.51	$ 20.96
Exercisable Options, Weighted Average Remaining Contractual Term at Period End	2 years 5 months
Exercisable Options, Aggregate Intrinsic Value at Period End	33,100,000
Share Price	$ 19.67
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	27,900,000		249,800,000	260,300,000
Total Fair Value of Options Vested	$ 70,900,000		$ 80,700,000	$ 83,200,000

[1] Stock options assumed in connection with the acquisition of Contrail.

[2] Stock options assumed in connection with the acquisition of Ankeena and Altor.