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Stockholders' Equity - Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Class of Stock [Line Items]      
Shares repurchased, value $ 446,000,000    
Common stock purchases 453,000,000 $ 0  
Cash paid for partial termination of 1.125% Warrants 30,000,000 103,000,000  
Share-based compensation 12,000,000 $ 9,000,000  
Unrecognized compensation expense $ 89,000,000    
Unrecognized compensation forfeiture rate 10.70%    
Stock options granted (in shares) 0    
RSAs      
Class of Stock [Line Items]      
Weighted average period for recognition 2 years 10 months 24 days    
PSUs      
Class of Stock [Line Items]      
Weighted average period for recognition 1 year 10 months 24 days    
Employee Stock Option      
Class of Stock [Line Items]      
Unrecognized compensation expense $ 3,000,000    
Weighted average period for recognition 6 months    
1.125% Warrants      
Class of Stock [Line Items]      
Stated percentage of warrants 1.125%    
Warrants outstanding     310,000
Cash paid for partial termination of 1.125% Warrants $ 30,000,000    
Common Stock      
Class of Stock [Line Items]      
Authorized amount     $ 500,000,000
Shares repurchased (in shares) 3,400,000    
Shares repurchased, value $ 446,000,000    
Shares repurchased (in dollars per share) $ 132.45    
Common stock purchases $ 7,000,000    
Number of common stock issued (in shares) 98,000 1,000,000