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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 (588)       (588)  
Other comprehensive income (5)         (5)
Vesting of restricted stock units (in shares)   1        
Vesting of restricted stock units (7)   $ (7)      
Stock compensation expense 15     15    
Stock issued under Crewmember stock purchase plan (in shares)   2        
Stock issued under Crewmember stock purchase plan 22     22    
Shares repurchased (in shares)     13      
Shares repurchased (160)   $ (192) 32    
Warrants issued under federal support programs 18     18    
Ending balance (in shares) at Jun. 30, 2020   430 (158)      
Ending balance at Jun. 30, 2020 4,094 $ 4 $ (1,981) 2,340 3,734 (3)
Beginning balance (in shares) at Mar. 31, 2020   428 (158)      
Beginning balance at Mar. 31, 2020 4,366 $ 4 $ (1,980) 2,294 4,054 (6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (320)          
Other comprehensive income 3         3
Vesting of restricted stock units (in shares)   0        
Vesting of restricted stock units (1)   $ (1)      
Stock compensation expense 6     6    
Stock issued under Crewmember stock purchase plan (in shares)   2        
Stock issued under Crewmember stock purchase plan 22     22    
Warrants issued under federal support programs 18     18    
Ending balance (in shares) at Jun. 30, 2020   430 (158)      
Ending balance at Jun. 30, 2020 4,094 $ 4 $ (1,981) 2,340 3,734 (3)
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 (183)       (183)  
Other comprehensive income 0         0
Vesting of restricted stock units (in shares)   1        
Vesting of restricted stock units (8)   $ (8)      
Stock compensation expense 17     17    
Stock issued under Crewmember stock purchase plan (in shares)   1        
Stock issued under Crewmember stock purchase plan 22     22    
Shares repurchased (in shares)     0      
Shares repurchased 0   $ 0 0    
Warrants issued under federal support programs 14     14    
Ending balance (in shares) at Jun. 30, 2021   476 (158)      
Ending balance at Jun. 30, 2021 3,813 $ 5 $ (1,989) 3,012 2,785 0
Beginning balance (in shares) at Mar. 31, 2021   475 (158)      
Beginning balance at Mar. 31, 2021 3,714 $ 5 $ (1,987) 2,975 2,721 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss 64       64  
Vesting of restricted stock units (in shares)   0        
Vesting of restricted stock units (2)   $ (2)      
Stock compensation expense 9     9    
Stock issued under Crewmember stock purchase plan (in shares)   1        
Stock issued under Crewmember stock purchase plan 22     22    
Warrants issued under federal support programs 6     6    
Ending balance (in shares) at Jun. 30, 2021   476 (158)      
Ending balance at Jun. 30, 2021 $ 3,813 $ 5 $ (1,989) $ 3,012 $ 2,785 $ 0