XML 62 R47.htm IDEA: XBRL DOCUMENT
v3.22.1

Commitments and Contingencies - Narrative (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) employee aircraft | Apr. 21, 2022 aircraft
Commitments and Contingencies [Line Items] |  |
Remaining term of debt | 11 years |
Boeing 737 MAX |  |
Commitments and Contingencies [Line Items] |  |
Sale leaseback transaction, number of leased assets expected to be purchased in next fiscal year | aircraft | 8 |
Boeing 737 MAX | Subsequent Event |  |
Commitments and Contingencies [Line Items] |  |
Number of aircraft expected to take delivery that are delayed | aircraft |  | 7
Boeing 787 | Subsequent Event |  |
Commitments and Contingencies [Line Items] |  |
Number of aircraft expected to take delivery that are delayed | aircraft |  | 2
United Airlines, Inc. |  |
Commitments and Contingencies [Line Items] |  |
Number of employees | employee | 87,400 |
Percentage of employees represented by various U.S. labor organizations | 85.00% |
Tax-Exempt Special Facilities Revenue Bonds |  |
Commitments and Contingencies [Line Items] |  |
Aggregate principal amount of guarantee | $ 2,100 |
Aircraft Mortgage Debt |  |
Commitments and Contingencies [Line Items] |  |
Aggregate principal amount of guarantee | 102 |
Floating Rate Debt |  |
Commitments and Contingencies [Line Items] |  |
Debt | $ 13,200 |
Loans and Leases from Non-U.S. Entities |  |
Commitments and Contingencies [Line Items] |  |
Remaining term of debt | 11 years |
Aggregate balance | $ 10,000 |

X
- Definition Number of persons employed by the Entity + References No definition available. + Details
Name: | dei_EntityNumberOfEmployees
Namespace Prefix: | dei_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Years remaining on debt instruments. + References No definition available. + Details
Name: | ual_DebtInstrumentRemainingTerms
Namespace Prefix: | ual_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Aircrafts Expected To Take Delivery That Are Delayed + References No definition available. + Details
Name: | ual_NumberOfAircraftsExpectedToTakeDeliveryThatAreDelayed
Namespace Prefix: | ual_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of employees represented by labor organizations + References No definition available. + Details
Name: | ual_PercentageOfEmployeesRepresentedByLaborOrganizations
Namespace Prefix: | ual_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sale Leaseback Transaction, Purchase Option, Number Of Leased Assets Expected To Be Purchased In Next Fiscal Year + References No definition available. + Details
Name: | ual_SaleLeasebackTransactionPurchaseOptionNumberOfLeasedAssetsExpectedToBePurchasedInNextFiscalYear
Namespace Prefix: | ual_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_AircraftTypeAxis=ual_Boeing737MaxMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_AircraftTypeAxis=ual_Boeing787Member
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: | us-gaap_DebtInstrumentAxis=ual_TaxExemptBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ual_AircraftMortgageDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ual_FloatingRateDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ual_LoansAndLeasesFromNonUSEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |