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Stock Compensation - Additional Information (Details)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
award
shares
Dec. 31, 2015
USD ($)
award
shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accrual for cash-settled awards $ 3 $ 3 $ 6  
Stock compensation expense   14 16 $ 16
Total fair value of awards vested   21 13 10
Cash received from the exercise of stock options   2 7 15
Cash paid to settle SARs, RSUs and PSUs   2 2 4
Total unrecognized compensation cost related to nonvested awards granted and expected to vest $ 19 $ 19    
Weighted-average period in which the total unrecognized compensation cost is expected to be recognized 2 years      
Number of individual annual awards | award 3 3    
Cash award vesting period 3 years      
Expenses for annual cash incentive awards   $ 35 $ 44 $ 47
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued | shares   0.4    
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    
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 | shares 4.0 4.0