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Stock Compensation - Additional Information (Details)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
perf_measure
Mar. 31, 2019
USD ($)
perf_measure
shares
Mar. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of performance measures | perf_measure 2 2  
Cash paid to settle RSUs   $ 2  
Stock compensation expense   5 $ 4
Total unrecognized compensation cost related to nonvested awards granted and expected to vest $ 37 $ 37  
Weighted-average period in which the total unrecognized compensation cost is expected to be recognized 2 years 3 months 18 days    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued in period | shares   0.7  
Performance Share Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued in period | shares   0.2