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Equity-Based Compensation Performance Share Units (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Weighted-average fair value per unit and award    
Pretax expense for PSUs $ 13 $ 2
After-tax expense for PSUs 8 $ 1
Total compensation cost not yet recognized, PSUs $ 30  
Non-vested stock options weighted-average period for total compensation expense to be recognized ( in years) 1 year 10 months 24 days  
Performance Shares [Member]    
Number of restricted stock units and awards    
Non-vested at January 1 (shares) 0.0  
Granted (shares) 0.6  
Vested (shares) 0.0  
Forfeited (shares) (0.1)  
Non-vested at December 31 (shares) 0.5 0.0
Weighted-average fair value per unit and award    
Non-vested at January 1 (usd per share) $ 0  
Granted (usd per share) 76.41  
Vested (usd per share) 0.00  
Forfeited (usd per share) 76.41  
Non-vested at December 31 (usd per share) $ 76.41 $ 0
Performance Share Unit [Member]    
Number of restricted stock units and awards    
Non-vested at January 1 (shares) 0.8  
Granted (shares) 0.1  
Vested (shares) 0.0  
Forfeited (shares) (0.2)  
Non-vested at December 31 (shares) 0.7 0.8
Weighted-average fair value per unit and award    
Non-vested at January 1 (usd per share) $ 71.72  
Granted (usd per share) 56.55  
Vested (usd per share) 0.00  
Forfeited (usd per share) 71.72  
Non-vested at December 31 (usd per share) $ 68.23 $ 71.72
Non-vested stock options weighted-average period for total compensation expense to be recognized ( in years) 2 years  
Minimum [Member] | Performance Shares [Member]    
Weighted-average fair value per unit and award    
Range of PSU Award 0.00%  
Maximum [Member] | Performance Shares [Member]    
Weighted-average fair value per unit and award    
Range of PSU Award 200.00%