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Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
DEFERRED TAX LIABILITIES:      
Accelerated depreciation $ 2,883 $ 2,939  
Prepaid insurance 189 190  
Operating lease liabilities 356 423  
Other 188 67  
Total deferred tax liabilities 3,616 3,619  
DEFERRED TAX ASSETS:      
Accrued employee benefits 341 491  
Rapid rewards loyalty liability 636 632  
Operating lease liabilities 371 443  
Customer travel credits 305 117  
Construction obligation 0 72  
Net operating losses and tax credits 36 60  
Other 157 170  
Total deferred tax assets 1,846 1,985  
Net deferred tax liability 1,770 1,634  
Operating loss carryforwards 44 65  
CURRENT:      
Federal 337 (273) $ 610
State 33 (5) 102
Change in federal statutory rate (2) (188) 0
Total current 368 (466) 712
DEFERRED:      
Federal (43) (589) (18)
State 2 (76) (6)
State net operating losses 21 (51) 0
Change in federal statutory tax rate 0 0 (31)
Total deferred (20) (716) (55)
Total income tax provision (benefit) 348 (1,182) 657
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Taxes receivable 699 740  
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]      
Tax at statutory U.S. tax rates 278 (894) 621
State income taxes, net of federal benefit 45 (115) 76
Change in federal statutory tax rate (2) (188) (31)
Other, net 27 15 (9)
Total income tax provision (benefit) 348 (1,182) $ 657
CARES Act      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Taxes receivable $ 472 $ 470