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Commitments and Contingencies - Firm Commitments and Options to Purchase Aircraft (Details) - Dec. 31, 2019 | commitment | aircraft
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Airbus A321XLR |  |
Long-term Purchase Commitment [Line Items] |  |
Number of firm commitments | commitment | 50 |
Scheduled aircraft deliveries in 2020 |  | 0
Scheduled aircraft deliveries after 2020 |  | 50
Airbus A350 |  |
Long-term Purchase Commitment [Line Items] |  |
Number of firm commitments | commitment | 45 |
Scheduled aircraft deliveries in 2020 |  | 0
Scheduled aircraft deliveries after 2020 |  | 45
Boeing 737 MAX |  |
Long-term Purchase Commitment [Line Items] |  |
Number of firm commitments | commitment | 171 |
Scheduled aircraft deliveries in 2020 |  | 44
Scheduled aircraft deliveries after 2020 |  | 127
Boeing 777-300ER |  |
Long-term Purchase Commitment [Line Items] |  |
Number of firm commitments | commitment | 2 |
Scheduled aircraft deliveries in 2020 |  | 2
Scheduled aircraft deliveries after 2020 |  | 0
Boeing 787 |  |
Long-term Purchase Commitment [Line Items] |  |
Number of firm commitments | commitment | 16 |
Scheduled aircraft deliveries in 2020 |  | 15
Scheduled aircraft deliveries after 2020 |  | 1
Embraer E175 |  |
Long-term Purchase Commitment [Line Items] |  |
Number of firm commitments | 20 | 20
Scheduled aircraft deliveries in 2020 |  | 20
Scheduled aircraft deliveries after 2020 |  | 0

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- Definition Number Of Aircraft Expected To Take Delivery, Next Twelve Months + References No definition available. + Details
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- Definition Number Of Aircrafts Expected To Take Delivery, Thereafter + References No definition available. + Details
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Data Type: | xbrli:integerItemType
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- 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
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- 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
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- Details
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- Details
Name: | srt_AircraftTypeAxis=ual_AirbusA350Member
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- Details
Name: | srt_AircraftTypeAxis=ual_Boeing737MaxMember
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- Details
Name: | srt_AircraftTypeAxis=srt_B777300Member
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- Details
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- Details
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