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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Treasury Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2019   427 (145)      
Beginning balance at Dec. 31, 2019 $ 4,799 $ 4 $ (1,782) $ 2,253 $ 4,322 $ 2
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (268)          
Other comprehensive income (8)         (8)
Vesting of restricted stock units (in shares)   1        
Vesting of restricted stock units (6)   $ (6)      
Stock compensation expense 9     9    
Shares repurchased (in shares)     13      
Shares repurchased (160)   $ (192) 32    
Ending balance (in shares) at Mar. 31, 2020   428 (158)      
Ending balance at Mar. 31, 2020 4,366 $ 4 $ (1,980) 2,294 4,054 (6)
Beginning balance (in shares) at Dec. 31, 2020   474 (158)      
Beginning balance at Dec. 31, 2020 3,951 $ 5 $ (1,981) 2,959 2,968 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (247)          
Other comprehensive income 0         0
Vesting of restricted stock units (in shares)   1        
Vesting of restricted stock units (6)   $ (6)      
Stock compensation expense 8     8    
Warrants issued under federal support programs 8     8    
Ending balance (in shares) at Mar. 31, 2021   475 (158)      
Ending balance at Mar. 31, 2021 $ 3,714 $ 5 $ (1,987) $ 2,975 $ 2,721 $ 0