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Schedule of Commitments to Purchase Aircrafts (Detail) - United Airlines, Inc. - Capital Addition Purchase Commitments	Jun. 30, 2017 Aircraft	[1]
Airbus A350 Aircraft
Long-term Purchase Commitment [Line Items]
Number of new aircraft committed to purchase	35
Boeing 737NG/737 MAX Aircraft
Long-term Purchase Commitment [Line Items]
Number of new aircraft committed to purchase	165
Boeing 777-300ER Aircraft
Long-term Purchase Commitment [Line Items]
Number of new aircraft committed to purchase	4
Boeing 787 Aircraft
Long-term Purchase Commitment [Line Items]
Number of new aircraft committed to purchase	19
Embraer E175 Aircraft
Long-term Purchase Commitment [Line Items]
Number of new aircraft committed to purchase	14
[1] United also has options and purchase rights for additional aircraft.

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