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Schedule of Commitments to Purchase Aircrafts (Detail) - United Airlines, Inc. - Capital Addition Purchase Commitments	Dec. 31, 2016 Aircraft	[1]
Airbus A350-1000 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	12
Boeing 787-8/-9/-10 Aircraft
Long-term Purchase Commitment [Line Items]
Number of new aircraft committed to purchase	21
Embraer E175 Aircraft
Long-term Purchase Commitment [Line Items]
Number of new aircraft committed to purchase	24
[1] United also has options and purchase rights for additional aircraft.

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