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Stock-Based Compensation (Details Textuals) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award    
Intrinsic value of stock options exercised $ 2 $ 5
Total fair value of vested stock options $ 4 $ 3
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 0.00%  
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 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 3 years
Employee Stock Option    
Share-based Compensation Arrangement by Share-based Payment Award    
Recognized compensation expense for vesting of stock options $ 1 $ 1
Recognized compensation expense for accelerated vesting of stock options less than $1 million  
Unvested share-based payment awards $ 7  
Remaining requisite service periods, extend through first quarter 2023  
Restricted Stock Award    
Share-based Compensation Arrangement by Share-based Payment Award    
Recognized compensation expense for vesting of stock options $ 8 $ 3
Unvested share-based payment awards $ 33  
Remaining requisite service periods, extend through first quarter 2023  
Recognized compensation expense for accelerated vesting of restricted stock options $ 2