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Common Stockholders' Equity and Preferred Securities (Details) - USD ($)
 12 Months Ended
Apr. 21, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 15, 2021
Sep. 28, 2020
Jun. 15, 2020
Apr. 20, 2020
Class of Stock [Line Items]                
Number of shares repurchased (in shares)   4,000,000            
Repurchases of common stock   $ 342,000,000 $ 1,641,000,000 $ 1,250,000,000        
Common stock, par value (in dollars per share)   $ 0.01 $ 0.01          
Proceeds from the issuance of common stock $ 1,100,000,000 $ 2,100,000,000            
Common stock reserved for future issuance (in shares)   6,000,000            
Junior preferred stock outstanding (in shares)   2            
Junior preferred stock par value per share (in dollars per share)   $ 0.01            
Preferred stock authorized to issue (in shares)   250,000,000            
Public Offering                
Class of Stock [Line Items]                
Sale of common stock (in shares) 43,000,000              
Common stock, par value (in dollars per share) $ 0.01           $ 0.01  
Share price (in dollars per share) $ 26.50              
Equity Distribution Agreement                
Class of Stock [Line Items]                
Sale of common stock (in shares)   21,400,000            
Share price (in dollars per share)   $ 46.70            
Proceeds from the issuance of common stock   $ 989,000,000            
Number of shares issuable under Equity Distribution Agreement (up to) (in shares)             28,000,000  
CARES Act Credit Agreement | Line of Credit                
Class of Stock [Line Items]                
Aggregate principal amount           $ 520,000,000    
PSP Warrants                
Class of Stock [Line Items]                
Number of warrants issuable under agreement (up to)               4,600,000
Number of warrants issuable under agreement (up to)   4,800,000           2,300,000
Strike price (in dollars per share)   $ 31.50            
Term of warrants   5 years            
Fair value of warrants outstanding   $ 66,000,000            
Credit Agreement Warrants                
Class of Stock [Line Items]                
Number of warrants issuable under agreement (up to)           16,400,000    
Number of warrants issuable under agreement (up to)           1,700,000    
Strike price (in dollars per share)           $ 31.50    
Term of warrants           5 years    
Fair value of warrants outstanding           $ 30,000,000    
Amount of warrants issued as a percent of the principal amount of disbursements           10.00%    
PSP2 Warrants | Subsequent Event                
Class of Stock [Line Items]                
Number of warrants issuable under agreement (up to)         1,700,000      
Strike price (in dollars per share)         $ 43.26      
Term of warrants         5 years