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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |
Income tax provision at statutory rate | $ 822 | $ 556 |  | $ 1,058 |
State income taxes, net of federal income tax benefit | 50 | 29 |  | 30 |
Foreign tax rate differential | (90) | (84) |  | (43) |
Global intangible low-taxed income | 90 | 4 |  | 0 |
Foreign income taxes | 1 | 2 |  | 3 |
Nondeductible employee meals | 12 | 12 |  | 17 |
Impact of Tax Act | 0 | (5) |  | (189) |
State rate change | 0 | 3 |  | 12 |
Valuation allowance | (4) | (3) |  | (16) |
Other, net | 24 | 12 |  | 8 |
Income tax expense (benefit) | 905 | 526 | [1] | 880 | [1]
Current | 23 | 14 |  | (77) |
Deferred | 882 | 512 | [2] | 957 | [2]
Valuation allowance recorded | 58 | 59 |  |  |
United Airlines, Inc. |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax provision at statutory rate | 822 | 557 |  | 1,059 |
State income taxes, net of federal income tax benefit | 50 | 29 |  | 30 |
Foreign tax rate differential | (90) | (84) |  | (43) |
Global intangible low-taxed income | 90 | 4 |  | 0 |
Foreign income taxes | 1 | 2 |  | 3 |
Nondeductible employee meals | 12 | 12 |  | 17 |
Impact of Tax Act | 0 | (5) |  | (206) |
State rate change | 0 | 3 |  | 12 |
Valuation allowance | (4) | (3) |  | (16) |
Other, net | 24 | 12 |  | 8 |
Income tax expense (benefit) | 905 | 527 | [3] | 864 | [3]
Current | 23 | 14 |  | (77) |
Deferred | 882 | 513 | [4] | $ 941 | [4]
Valuation allowance recorded | $ 58 | $ 59 |  |  |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[2] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[3] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[4] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.

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