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Income Taxes - Income Tax Provision (Benefit) Differed from Amounts Computed at the Statutory Federal Income Tax Rate and Significant Components (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Line Items]      
Income tax provision (benefit) at statutory rate $ (1,852) $ 822 $ 556
State income taxes, net of federal income tax benefit (110) 50 29
Foreign tax rate differential 0 (90) (84)
Global intangible low-taxed income 0 90 4
Foreign income taxes 1 1 2
Nondeductible employee meals 5 12 12
State rate change (2) 0 3
Valuation allowance 197 (4) (3)
Other, net 8 24 7
Income tax expense (benefit) (1,753) 905 526
Current (12) 23 14
Deferred (1,741) 882 512
United Airlines, Inc.      
Income Taxes [Line Items]      
Income tax provision (benefit) at statutory rate (1,852) 822 557
State income taxes, net of federal income tax benefit (110) 50 29
Foreign tax rate differential 0 (90) (84)
Global intangible low-taxed income 0 90 4
Foreign income taxes 1 1 2
Nondeductible employee meals 5 12 12
State rate change (2) 0 3
Valuation allowance 197 (4) (3)
Other, net 8 24 7
Income tax expense (benefit) (1,753) 905 527
Current (12) 23 14
Deferred $ (1,741) $ 882 $ 513