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Details of Pass Through Trusts (Detail) - United Airlines, Inc. $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Class AA Pass Through Certificates | June 2016
Debt Instrument [Line Items]
Principal	$ 729
Final expected distribution date	2017-03
Stated interest rate	3.10%
Total debt recorded	$ 0
Remaining proceeds from issuance of debt to be received in future periods	729
Class A Pass Through Certificates | June 2016
Debt Instrument [Line Items]
Principal	$ 324
Final expected distribution date	2017-03
Stated interest rate	3.45%
Total debt recorded	$ 0
Remaining proceeds from issuance of debt to be received in future periods	324
EETC
Debt Instrument [Line Items]
Principal	1,053
Total debt recorded	0
Remaining proceeds from issuance of debt to be received in future periods	$ 1,053

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