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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
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Taxes [Line Items] |  |  |
Income tax provision (benefit) at statutory rate | $ 208 | $ (537) | $ (1,852)
State income tax provision (benefit), net of federal income tax benefit | 13 | (34) | (110)
Nondeductible employee meals | 12 | 7 | 5
Nondeductible transportation fringe benefit | 10 | 8 | 7
Valuation allowance | (10) | (38) | 197
Other, net | 20 | 1 | 0
Income tax expense (benefit) | 253 | (593) | (1,753)
Current | 5 | (10) | (12)
Deferred | 248 | (583) | (1,741)
United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
Income tax expense (benefit) | 253 | (593) | (1,753)
Deferred | $ 248 | $ (583) | $ (1,741)

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