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Employee Benefit Benefits and Stock-Based Compensation - Range of OSO Exercise Prices (Details) - Outperform Stock Options - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range        
Options exercised, Weighted Average Initial Strike Price (in dollars per share) $ 22.32 $ 24.26 $ 14.10  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 614,980.00000 1,217,869.000000 2,148,865.000000 2,066,419
Total realized value of OSO units $ 13 $ 19 $ 2  
OSO units Outstanding, Range of Exercise Prices, Minimum (in dollars per share) $ 20.29 $ 16.99 $ 14.1 $ 14.10
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Initial Exercise Price, Maximum $ 26.69 $ 27.53 $ 36.60 $ 36.60
OSO units Outstanding, Number Outstanding (in shares) 614,980      
OSO units Outstanding, Average Remaining Contractual Term 4 months 13 days 10 months 24 days 1 year 5 months 15 days 1 year 8 months 23 days
OSO units Outstanding, Weighted Average Initial Strike Price (in dollars per share) $ 22.77 $ 22.76 $ 23.99 $ 23.40
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (589,944) (771,251) (107,228)  
OSO units Exercisable, Number Exercisable (in shares) 0      
OSO units Exercisable, Weighted Average Initial Strike Price (in dollars per share) $ 0.00      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (12,945) (52,901) (271,883)  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 622,755 732,593 0