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Stockholders' Equity - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 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         30,000,000 424,000,000  
Share-based compensation $ 16,000,000   $ 10,000,000   28,000,000 $ 19,000,000  
Unrecognized compensation expense 85,000,000       $ 85,000,000    
Unrecognized compensation forfeiture rate         11.30%    
Stock options granted (in shares)         0    
RSAs              
Class of Stock [Line Items]              
Weighted average period for recognition         2 years 8 months 12 days    
PSUs              
Class of Stock [Line Items]              
Weighted average period for recognition         1 year 8 months 12 days    
Employee stock option              
Class of Stock [Line Items]              
Unrecognized compensation expense $ 1,000,000       $ 1,000,000    
1.125% Warrants              
Class of Stock [Line Items]              
Stated percentage of warrants 1.125%       1.125%    
Warrants outstanding (in shares)             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)       1,000,000 188,000