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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, 2018   422 (116)      
Beginning balance at Dec. 31, 2018 $ 4,685 $ 4 $ (1,272) $ 2,203 $ 3,753 $ (3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
NET (LOSS) INCOME 569       569  
Other comprehensive income (loss) 5         5
Vesting of restricted stock units (in shares)   2        
Vesting of restricted stock units (6)   $ (6)      
Stock compensation expense 31     31    
Stock issued under crewmember stock purchase plan (in shares)   3        
Shares issued under Crewmember Stock Purchase Plan 51     51    
Shares repurchased (in shares)     29      
Shares repurchased (536)   $ (504) (32)    
Ending balance (in shares) at Dec. 31, 2019   427 (145)      
Ending balance at Dec. 31, 2019 4,799 $ 4 $ (1,782) 2,253 4,322 2
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
NET (LOSS) INCOME (1,354)       (1,354)  
Other comprehensive income (loss) (2)         (2)
Vesting of restricted stock units (in shares)   1        
Vesting of restricted stock units (7)   $ (7)      
Stock compensation expense 28     28    
Stock issued under crewmember stock purchase plan (in shares)   4        
Shares issued under Crewmember Stock Purchase Plan 35     35    
Shares repurchased (in shares)     13      
Shares repurchased (160)   $ (192) 32    
Warrants issued under federal support programs 28     28    
Shares issued under common stock offering (in shares)   42        
Shares issued under common stock offering 584 $ 1   583    
Ending balance (in shares) at Dec. 31, 2020   474 (158)      
Ending balance at Dec. 31, 2020 3,951 $ 5 $ (1,981) 2,959 2,968 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
NET (LOSS) INCOME (182)       (182)  
Other comprehensive income (loss) 0          
Vesting of restricted stock units (in shares)   1        
Vesting of restricted stock units (8)   $ (8)      
Stock compensation expense 28     28    
Stock issued under crewmember stock purchase plan (in shares)   3        
Shares issued under Crewmember Stock Purchase Plan 46     46    
Warrants issued under federal support programs 14     14    
Ending balance (in shares) at Dec. 31, 2021   478 (158)      
Ending balance at Dec. 31, 2021 $ 3,849 $ 5 $ (1,989) $ 3,047 $ 2,786 $ 0