XML 68 R44.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Commitments and Contingencies - Schedule of Commitments to Purchase Aircrafts (Details) | Jun. 30, 2018 commitment
--- | ---
Airbus A350 |
Long-term Purchase Commitment [Line Items] |
Number of Firm Commitments | 45
Boeing 737 MAX |
Long-term Purchase Commitment [Line Items] |
Number of Firm Commitments | 155
Boeing 777-300ER |
Long-term Purchase Commitment [Line Items] |
Number of Firm Commitments | 1
Boeing 787 |
Long-term Purchase Commitment [Line Items] |
Number of Firm Commitments | 18

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_LongTermPurchaseCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum number of units that must be purchased, in connection with an unconditional purchase obligation that has not been recognized for financial reporting purposes. + References No definition available. + Details
Name: | us-gaap_UnrecordedUnconditionalPurchaseObligationMinimumQuantityRequired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_AircraftTypeAxis=ual_AirbusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_AircraftTypeAxis=us-gaap_B777300Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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