Schedule of Commitments to Purchase Aircrafts (Detail) - United Airlines, Inc. - Capital Addition Purchase Commitments		Jun. 30, 2015 Aircraft
Airbus A350-1000 Aircraft
Commitments [Line Items]
Number of new aircraft committed to purchase	[1]	35
Boeing 737NG/737 MAX 9 aircraft
Commitments [Line Items]
Number of new aircraft committed to purchase	[1]	123
B-777-300ER
Commitments [Line Items]
Number of new aircraft committed to purchase	[1]	10
Boeing 787-8/-9/-10 Aircraft
Commitments [Line Items]
Number of new aircraft committed to purchase	[1]	37
Embraer E175 aircraft
Commitments [Line Items]
Number of new aircraft committed to purchase	[1]	10

[1] United also has options and purchase rights for additional aircraft.