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Consolidated Statements of Operations - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues [Abstract]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 2,086 $ 8,094 $ 7,658 $ 7,012
OPERATING EXPENSES        
Aircraft fuel and related taxes   1,847 1,899 1,363
Salaries, wages and benefits   2,320 2,044 1,887
Landing fees and other rents   474 462 438
Depreciation and amortization   525 469 424
Aircraft rent   99 104 102
Sales and marketing   290 294 271
Maintenance, materials and repairs   619 625 622
Other operating expenses   1,106 1,060 932
Special Items   14 435 0
Total operating expenses   7,294 7,392 6,039
OPERATING INCOME 247 800 266 973
OTHER INCOME (EXPENSE)        
Interest expense   (79) (70) (71)
Capitalized interest   14 10 10
Gain (Loss) on Sale of Previously Unissued Stock by Subsidiary or Equity Investee, Nonoperating Income 15 15 0 0
Interest income and other   18 13 6
Total other income (expense)   (32) (47) (55)
INCOME BEFORE INCOME TAXES   768 219 918
Income tax expense (benefit)   199 30 (222)
NET INCOME $ 187 $ 569 $ 189 $ 1,140
EARNINGS PER COMMON SHARE        
Basic $ 0.63 $ 1.92 $ 0.60 $ 3.47
Diluted $ 0.63 $ 1.91 $ 0.60 $ 3.45
Passenger [Member]        
Revenues [Abstract]        
Revenue from Contract with Customer, Excluding Assessed Tax   $ 7,786 $ 7,381 $ 6,761
Product and Service, Other [Member]        
Revenues [Abstract]        
Revenue from Contract with Customer, Excluding Assessed Tax   $ 308 $ 277 $ 251