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Stock Compensation - Additional Information (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Accrual for cash-settled awards $ 7   $ 2 $ 7  
Total unrecognized compensation cost related to nonvested awards granted and expected to vest     20    
Weighted-average period in which the total unrecognized compensation cost is expected to be recognized 1 year 8 months 12 days        
Cash award vesting period 3 years 3 years      
Expenses for cash incentive awards     $ 33 $ 77 $ 41
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued     0.7    
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     $ 1    
Outstanding options and SARs, weighted-average remaining contractual term 3 years 1 month 6 days        
Performance Share Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued     0.2    
Stock vesting period (in years)     3 years    
Omnibus Incentive Plan 2017 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares of common stock available for future grant     5.6