XML 43 R50.htm IDEA: XBRL DOCUMENT
v3.19.3

Leases - Narrative (Details) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2019 USD ($) aircraft
Lessee, Lease, Description [Line Items] |
Additional leases that have not yet commenced | $ | $ 915
Maximum |
Lessee, Lease, Description [Line Items] |
Lease terms of additional leases that have not yet commenced (up to) | 34 years
Mainline Aircraft |
Lessee, Lease, Description [Line Items] |
Number of aircraft subject to operating leases | 117
Number of aircraft subject to finance leases | 26
Mainline Aircraft | Minimum |
Lessee, Lease, Description [Line Items] |
Initial term of operating leases | 1 month
Mainline Aircraft | Maximum |
Lessee, Lease, Description [Line Items] |
Initial term of operating leases | 10 years
Regional Aircraft |
Lessee, Lease, Description [Line Items] |
Number of aircraft subject to operating leases | 325
Number of aircraft subject to finance leases | 28
Non-Aircraft | Minimum |
Lessee, Lease, Description [Line Items] |
Initial term of operating leases | 1 month
Non-Aircraft | Maximum |
Lessee, Lease, Description [Line Items] |
Initial term of operating leases | 34 years

X
- Definition Lessee, Operating And Finance Lease, Not Yet Commenced, Amount + References No definition available. + Details
Name: | ual_LesseeOperatingAndFinanceLeaseNotYetCommencedAmount
Namespace Prefix: | ual_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Operating And Finance Lease, Not Yet Commenced, Term Of Contract + References No definition available. + Details
Name: | ual_LesseeOperatingAndFinanceLeaseNotYetCommencedTermOfContract
Namespace Prefix: | ual_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lessee, Operating And Finance Leases, Term Of Contract + References No definition available. + Details
Name: | ual_LesseeOperatingAndFinanceLeasesTermOfContract
Namespace Prefix: | ual_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Aircraft Subject To Finance Leases + References No definition available. + Details
Name: | ual_NumberOfAircraftSubjectToFinanceLeases
Namespace Prefix: | ual_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Aircraft Subject To Operating Leases + References No definition available. + Details
Name: | ual_NumberOfAircraftSubjectToOperatingLeases
Namespace Prefix: | ual_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_MainlineMember
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_ProductOrServiceAxis=us-gaap_RegionalCarrierMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=ual_NonAircraftMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |