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Debt (Detail) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Less: current portion of long-term debt		$ (1,565)	$ (849)
Long-term debt, net		11,703	9,918
United Airlines, Inc.
Debt Instrument [Line Items]
Less: current portion of long-term debt		(1,565)	(849)
Long-term debt, net		11,703	9,918
UAL and United
Debt Instrument [Line Items]
Long-term Debt, Gross		13,431	10,891
Less: unamortized debt discount, premiums and debt issuance costs		(163)	(124)
Less: current portion of long-term debt		(1,565)	(849)
Long-term debt, net		11,703	9,918
Secured Debt | Notes payable, fixed interest rates of 2.88% to 9.52% (weighted average rate of 4.39% as of December 31, 2017), payable through 2028 | United Airlines, Inc.
Debt Instrument [Line Items]
Long-term Debt, Gross		8,661	7,586
Secured Debt | Notes payable, floating interest rates of the London interbank offered rate ("LIBOR") plus 0.2% to 2.25%, payable through 2028 | United Airlines, Inc.
Debt Instrument [Line Items]
Long-term Debt, Gross		1,880	1,546
Secured Debt | Term Loan Facility Due 2024 | United Airlines, Inc.
Debt Instrument [Line Items]
Long-term Debt, Gross		1,489
Secured Debt | Term Loan Facility Due April 2019 | United Airlines, Inc.
Debt Instrument [Line Items]
Long-term Debt, Gross			866
Secured Debt | Term Loan Facility Due September 2021 | United Airlines, Inc.
Debt Instrument [Line Items]
Long-term Debt, Gross			192
Unsecured Debt | 6.375% Senior Notes due 2018
Debt Instrument [Line Items]
Long-term Debt, Gross	[1]	300	300
Unsecured Debt | 6% Senior Notes due 2020
Debt Instrument [Line Items]
Long-term Debt, Gross	[1]	300	300
Unsecured Debt | 4.25% Senior Notes due 2022 | United Airlines, Inc.
Debt Instrument [Line Items]
Long-term Debt, Gross	[1]	400
Unsecured Debt | 5% Senior Notes due 2024 | United Airlines, Inc.
Debt Instrument [Line Items]
Long-term Debt, Gross	[1]	300
Unsecured Debt | Other Debt | United Airlines, Inc.
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 101	$ 101
[1] UAL is the issuer of this debt. United is a guarantor.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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