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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Millions
Total
Adoption of new accounting standards
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Adoption of new accounting standards
Retained Earnings
Retained Earnings
Adoption of new accounting standards
Beginning Balance (in shares) at Dec. 31, 2017 59,300,000   60,000,000          
Beginning Balance at Dec. 31, 2017 $ 1,337 $ 6 $ 0 $ 1,044 $ (5) $ (1) $ 298 $ 7
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 707           707  
Termination of warrants (550)     (550)        
Exchange of convertible senior notes (in shares)     2,000,000          
Exchange of convertible senior notes 108     108        
Conversion of convertible senior notes 4     4        
Other comprehensive income (loss), net (2)       (2)      
Share-based compensation $ 37     37        
Ending Balance (in shares) at Dec. 31, 2018 62,100,000   62,000,000          
Ending Balance at Dec. 31, 2018 $ 1,647 $ 85 $ 0 643 (8)   1,012 $ 85
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 737           737  
Common stock purchases (54)     (1)     (53)  
Termination of warrants (514)     (514)        
Exchange of convertible senior notes 0              
Other comprehensive income (loss), net 12       12      
Share-based compensation $ 47     47        
Ending Balance (in shares) at Dec. 31, 2019 61,900,000   62,000,000          
Ending Balance at Dec. 31, 2019 $ 1,960   $ 0 175 4   1,781  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 673              
Common stock purchases (in shares)     (4,000,000)          
Common stock purchases (605)     (11)     (594)  
Termination of warrants (30)     (30)        
Exchange of convertible senior notes 0              
Other comprehensive income (loss), net 33       33      
Share-based compensation (in shares)     1,000,000          
Share-based compensation 65     65        
Ending Balance (in shares) at Dec. 31, 2020     59,000,000          
Ending Balance at Dec. 31, 2020 $ 2,096   $ 0 $ 199 $ 37   $ 1,860