Employee Benefit Plans (Details) (USD $)	12 Months Ended				36 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2014
Share-Based Compensation Plans
Options Assumed, Number of Shares			900,000
Common shares outstanding from equtiy awards through acquisition	4,100,000				4,100,000
Common stock - issued	416,200,000	495,200,000			416,200,000
Stock Option Activities
Beginning Balance, Number of Shares	23,100,000	34,100,000	38,600,000		38,600,000
Options Granted, Number of Shares			3,100,000
Options Assumed, Number of Shares			900,000
Options Canceled, Number of Shares	(600,000)	(1,300,000)	(2,800,000)
Options Exercised, Number of Shares	(5,400,000)	(5,600,000)	(3,600,000)
Options Expired, Number of Shares	(7,200,000)	(4,100,000)	(2,100,000)
Ending Balance, Number of Shares	9,900,000	23,100,000	34,100,000	38,600,000	9,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Beginning Balance, Weighted Average Exercise Price	$ 25.15	$ 24.13	$ 23.98		23.98
Options Granted, Weighted Average Exercise Price			$ 22.81
Options Assumed, Weighted Average Exercise Price			$ 0.57
Options Canceled, Weighted Average Exercise Price	$ 30.15	$ 29.56	$ 26.64
Options Exercised, Weighted Average Exercise Price	$ 19.76	$ 15.58	$ 11.71
Options Expired, Weighted Average Exercise Price	$ 29.11	$ 28.35	$ 26.97
Ending Balance, Weighted Average Exercise Price	$ 24.87	$ 25.15	$ 24.13	$ 23.98	24.87
Weighted Average Remaining Contractual Term at Period End	2 years	2 years 4 months 24 days	3 years 1 month 6 days	3 years 8 months 12 days
Aggregate Intrinsic Value at Period End	$ 24,700,000	$ 44,600,000	$ 52,500,000	$ 75,300,000	24,700,000
Vested or Expected-to-Vest Options, Number of Shares at Period End	9,800,000				9,800,000
Vested or Expected-to-Vest Options, Weighted Average Exercise Price at Period End	$ 25.00				25.00
Vested and Expected-to-Vest Options, Weighted Average Remaining Contractual Term at Period End	2 years
Vested or Expected-to-Vest Options, Aggregate Intrinsic Value at Period End	23,600,000				23,600,000
Exercisable Options, Number of Shares at Period End	9,100,000				9,100,000
Exercisable Options, Weighted Average Exercise Price at Period End	$ 25.88				25.88
Exercisable Options, Weighted Average Remaining Contractual Term at Period End	1 year 8 months 12 days
Exercisable Options, Aggregate Intrinsic Value at Period End	15,900,000				15,900,000
Share Price	$ 22.32				22.32
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	33,400,000	29,400,000	27,900,000
Total Fair Value of Options Vested	20,800,000	45,200,000	70,900,000
Equity Incentive Plan 2006 [Member]
Share-Based Compensation Plans
Number of shares in authorized	149,500,000.0				149,500,000.0
Number of Shares Available for Future Issuance	47,800,000	49,100,000			47,800,000
Stock Option Activities
Options Canceled, Number of Shares	(600,000)
Options Expired, Number of Shares	(7,200,000)
Plan 1996 and 2000 [Member]
Share-Based Compensation Plans
Maximum Additional Shares Expire Unexercised, Under 1996 and 2000 Plan	75,000,000.0				75,000,000.0
Equity Incentive Plan 1996, 2000, and 2006 [Member]
Share-Based Compensation Plans
Shares outstanding under 2006 plan	27,100,000				27,100,000
Employee Stock Purchase Plan 2008 [Member]
Share-Based Compensation Plans
Common stock reserved for future issuance for equity incentive plans	19,000,000				19,000,000
Number of Shares Available for Future Issuance	3,300,000				3,300,000
Maximum Term for Options	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price	15.00%
Periodic Payroll Deduction - Percentage of Base Salary	10.00%				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
Common stock - issued	15,700,000				15,700,000
Stock Compensation Plan [Member]
Share-Based Compensation Plans
Common stock reserved for future issuance for equity incentive plans	82,300,000				82,300,000
Stock Options [Member] | Equity Incentive Plan 2006 [Member]
Share-Based Compensation Plans
Option Vest Period	4 years
RSUs and PSAs [Member] | Equity Incentive Plan 2006 [Member]
Share-Based Compensation Plans
Vest period for share based compensation that vests solely based on continued employment	3 years
Vest period for share based compensation that vests based on other factors	1 year
From 2006 [Member] | Stock Options [Member] | Equity Incentive Plan 2006 [Member]
Share-Based Compensation Plans
Maximum Term for Options	7 years
Prior to 2006 [Member] | Stock Options [Member] | Prior to 2006 [Member]
Share-Based Compensation Plans
Maximum Term for Options	10 years
Mykonos, Contrail and WANDL [Member]
Share-Based Compensation Plans
Options Assumed, Number of Shares					8,500,000
Stock Option Activities
Options Assumed, Number of Shares					8,500,000