XML 66 R52.htm IDEA: XBRL DOCUMENT v3.19.1

Commitments and Contingencies - Firm Commitments and Options to Purchase Aircraft (Details)	Mar. 31, 2019 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	171
Boeing 777-300ER
Long-term Purchase Commitment [Line Items]
Number of firm commitments	4
Boeing 787
Long-term Purchase Commitment [Line Items]
Number of firm commitments	20
Embraer E175
Long-term Purchase Commitment [Line Items]
Number of firm commitments	25

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:

X

- Details

Name:	us-gaap_AircraftTypeAxis=ual_EmbraerE175Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: