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Stock-based Compensation - Schedule of Share-based Compensation, Restricted Stock and Restricted Units Activity (Details) - Restricted Stock and Restricted Stock Units [Member] - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Beginning balance (in shares) 1.7  
Outstanding (in dollars per share) $ 29.18 $ 32.22
Granted (in shares) 0.9 1.7
Granted (in dollars per share) $ 23.64 $ 32.22
Vested (in shares) (0.2)  
Vested (in dollars per share) $ 31.60  
Forfeited (in shares) (0.1)  
Forfeited (in dollars per share) $ 26.91  
Ending balance (in shares) 2.3 1.7