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Stock Compensation - Additional Information (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accrual for cash-settled awards $ 5 $ 5 $ 3  
Total unrecognized compensation cost related to nonvested awards granted and expected to vest $ 21 21    
Weighted-average period in which the total unrecognized compensation cost is expected to be recognized 1 year 9 months 18 days      
Cash award vesting period 3 years   3 years 3 years
Expenses for annual cash incentive awards   $ 41 $ 35 $ 44
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued   0.5    
Stock vesting period (in years)   3 years    
Stock Option And Stock Appreciation Rights [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock vesting period (in years)   3 years    
Option maximum term (in years)   10 years    
Outstanding options and SARs, aggregate intrinsic value $ 8 $ 8    
Outstanding options and SARs, weighted-average remaining contractual term 4 years 10 months 24 days      
Performance Share Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock vesting period (in years)   3 years    
Omnibus Incentive Plan 2012 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares of common stock available for future grant 3.2 3.2