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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

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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.2) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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