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Share-Based Compensation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Share repurchase program    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Dividends per share (in USD per share) $ 0.23 $ 0.46
Performance based restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award grants in period (in shares) 1.3  
Aggregate grant date fair value of stock-based compensation arrangement $ 28  
Share-based awards vesting period 3 years  
Time-based restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award grants in period (in shares) 0.7  
Aggregate grant date fair value of stock-based compensation arrangement $ 13  
Share-based awards vesting period 3 years  
Time-based stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award grants in period (in shares) 1.1  
Aggregate grant date fair value of stock-based compensation arrangement $ 6  
Share-based awards vesting period 3 years