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Statements of Consolidated Operations - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating revenue:      
Operating revenue $ 15,355 $ 43,259 $ 41,303
Operating expense:      
Salaries and related costs 9,522 12,071 11,458
Aircraft fuel 3,153 8,953 9,307
Depreciation and amortization 2,488 2,288 2,165
Landing fees and other rent 2,127 2,543 2,449
Regional capacity purchase 2,039 2,849 2,649
Aircraft maintenance materials and outside repairs 858 1,794 1,767
Distribution expenses 459 1,651 1,558
Aircraft rent 198 288 433
Special charges (credit) (2,616) 246 487
Other operating expenses 3,486 6,275 5,801
Total operating expense 21,714 38,958 38,074
Operating income (loss) (6,359) 4,301 3,229
Nonoperating income (expense):      
Interest expense (1,063) (731) (670)
Interest capitalized 71 85 65
Interest income 50 133 101
Unrealized gains (losses) on investments, net (194) 153 (5)
Miscellaneous, net (1,327) (27) (72)
Total nonoperating expense, net (2,463) (387) (581)
Income (loss) before income taxes (8,822) 3,914 2,648
Income tax expense (benefit) (1,753) 905 526
Net income (loss) $ (7,069) $ 3,009 $ 2,122
Earnings per share, basic (in dollars per share) $ (25.30) $ 11.63 $ 7.70
Earnings per share, diluted (in dollars per share) $ (25.30) $ 11.58 $ 7.67
United Airlines, Inc.      
Operating revenue:      
Operating revenue $ 15,355 $ 43,259 $ 41,303
Operating expense:      
Salaries and related costs 9,522 12,071 11,458
Aircraft fuel 3,153 8,953 9,307
Depreciation and amortization 2,488 2,288 2,165
Landing fees and other rent 2,127 2,543 2,449
Regional capacity purchase 2,039 2,849 2,649
Aircraft maintenance materials and outside repairs 858 1,794 1,767
Distribution expenses 459 1,651 1,558
Aircraft rent 198 288 433
Special charges (credit) (2,616) 246 487
Other operating expenses 3,484 6,273 5,799
Total operating expense 21,712 38,956 38,072
Operating income (loss) (6,357) 4,303 3,231
Nonoperating income (expense):      
Interest expense (1,063) (731) (670)
Interest capitalized 71 85 65
Interest income 50 133 101
Unrealized gains (losses) on investments, net (194) 153 (5)
Miscellaneous, net (1,327) (27) (72)
Total nonoperating expense, net (2,463) (387) (581)
Income (loss) before income taxes (8,820) 3,916 2,650
Income tax expense (benefit) (1,753) 905 527
Net income (loss) (7,067) 3,011 2,123
Passenger revenue      
Operating revenue:      
Operating revenue 11,805 39,625 37,706
Passenger revenue | United Airlines, Inc.      
Operating revenue:      
Operating revenue 11,805 39,625 37,706
Cargo      
Operating revenue:      
Operating revenue 1,648 1,179 1,237
Cargo | United Airlines, Inc.      
Operating revenue:      
Operating revenue 1,648 1,179 1,237
Other operating revenue      
Operating revenue:      
Operating revenue 1,902 2,455 2,360
Other operating revenue | United Airlines, Inc.      
Operating revenue:      
Operating revenue $ 1,902 $ 2,455 $ 2,360