XML 90 R60.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Taxes [Line Items] |  |  |
Capital loss carryforwards, valuation allowance | $ 183 |  |
Unrecognized tax benefits | 55 | $ 57 | $ 53
Unrecognized tax benefits that would impact effective tax rate if recognized | 55 |  |
Federal |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | 9,900 |  |
Tax effected amount of NOLs | 2,100 |  |
Tax credits | 40 |  |
Deferred tax asset, portion to be utilized against deferred tax liabilities | 6,200 |  |
Deferred tax asset, portion to be utilized against future taxable income | 1,300 |  |
Federal | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | 9,900 |  |
Tax effected amount of NOLs | 2,100 |  |
NOLs without an expiration date | $ 8,400 |  |
Federal | Minimum |  |  |
Income Taxes [Line Items] |  |  |
Tax credit expiration period | 1 year |  |
Federal | Maximum |  |  |
Income Taxes [Line Items] |  |  |
Tax credit expiration period | 18 years |  |
Federal | 2028 | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | $ 500 |  |
Federal | 2029 | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | 400 |  |
Federal | 2032 | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | 200 |  |
Federal | 2033 | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | 400 |  |
State |  |  |
Income Taxes [Line Items] |  |  |
Tax credits | 45 |  |
NOL and tax credit carryforwards, valuation allowance | 27 |  |
State | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL carryforwards | 3,300 |  |
Tax effected amount of NOLs | $ 200 |  |
State | Minimum |  |  |
Income Taxes [Line Items] |  |  |
Tax credit expiration period | 1 year |  |
State | Minimum | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL expiration period | 5 years |  |
State | Maximum |  |  |
Income Taxes [Line Items] |  |  |
Tax credit expiration period | 11 years |  |
State | Maximum | United Airlines, Inc. |  |  |
Income Taxes [Line Items] |  |  |
NOL expiration period | 20 years |  |

X
- Definition Capital Loss Carryforwards, Valuation Allowance + References No definition available. + Details
Name: | ual_CapitalLossCarryforwardsValuationAllowance
Namespace Prefix: | ual_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Deferred Tax Asset, Portion Utilized Against Deferred Tax Liabilities + References No definition available. + Details
Name: | ual_DeferredTaxAssetPortionToBeUtilizedAgainstDeferredTaxLiabilities
Namespace Prefix: | ual_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Deferred Tax Asset, Portion To Be Utilized Against Future Taxable Income + References No definition available. + Details
Name: | ual_DeferredTaxAssetPortionToBeUtilizedAgainstFutureTaxableIncome
Namespace Prefix: | ual_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Income Taxes [Line Items] + References No definition available. + Details
Name: | ual_IncomeTaxesLineItems
Namespace Prefix: | ual_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Operating Loss Carryforwards And Tax Credit Carryforwards, Valuation Allowance + References No definition available. + Details
Name: | ual_OperatingLossCarryforwardsAndTaxCreditCarryforwardsValuationAllowance
Namespace Prefix: | ual_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Operating Loss Carryforwards, Expiration Period + References No definition available. + Details
Name: | ual_OperatingLossCarryforwardsExpirationPeriod
Namespace Prefix: | ual_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Operating Loss Carryforwards, Tax Effected Amount + References No definition available. + Details
Name: | ual_OperatingLossCarryforwardsTaxEffectedAmount
Namespace Prefix: | ual_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Tax Credit Carryforward, Expiration Period + References No definition available. + Details
Name: | ual_TaxCreditCarryforwardExpirationPeriod
Namespace Prefix: | ual_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are not subject to expiration dates. + References No definition available. + Details
Name: | us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + Details
Name: | us-gaap_OperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + Details
Name: | us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_DomesticCountryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=ual_UnitedAirLinesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ual_NetOperatingLossCarryforwardByExpirationAxis=ual_NetOperatingLossCarryForwardExpirationYear2028Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ual_NetOperatingLossCarryforwardByExpirationAxis=ual_NetOperatingLossCarryForwardExpirationYear2029Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ual_NetOperatingLossCarryforwardByExpirationAxis=ual_NetOperatingLossCarryForwardExpirationYear2032Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ual_NetOperatingLossCarryforwardByExpirationAxis=ual_NetOperatingLossCarryForwardExpirationYear2033Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |