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Stock-Based Compensation (Details Textuals) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Stock Based Compensation (Textuals) [Abstract]    
Intrinsic value of stock options exercised $ 10 $ 12
Total fair value of vested stock options $ 4 $ 4
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 25.00%  
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 150.00%  
Service-based Restricted Stock Award    
Share-based Compensation Arrangement by Share-based Payment Award    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years
Performance-based Restricted Stock Award    
Share-based Compensation Arrangement by Share-based Payment Award    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years
Employee Stock Option    
Share-based Compensation Arrangement by Share-based Payment Award    
Recognized compensation expense for vesting of stock options $ 3 $ 3
Recognized compensation expense for accelerated vesting of stock options less than $1 million  
Unvested share-based payment awards $ 5  
Remaining requisite service periods, extend through first quarter 2022  
Restricted Stock Award    
Share-based Compensation Arrangement by Share-based Payment Award    
Recognized compensation expense for vesting of stock options $ 10 $ 14
Recognized compensation expense for accelerated vesting of restricted stock options 1  
Unvested share-based payment awards $ 21  
Remaining requisite service periods, extend through first quarter 2022