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Debt (Detail) - USD ($) $ in Millions		Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Less: current portion of long-term debt		$ (849)	$ (1,224)
Long-term debt, net		9,918	9,673
United Airlines, Inc.
Debt Instrument [Line Items]
Less: current portion of long-term debt		(849)	(1,224)
Long-term debt, net		9,918	9,673
UAL and United
Debt Instrument [Line Items]
Long-term Debt, Gross		10,891	11,042
Less: unamortized debt discount, premiums and debt issuance costs		(124)	(145)
Less: current portion of long-term debt		(849)	(1,224)
Long-term debt, net		9,918	9,673
Secured Debt | Notes payable, fixed interest rates of 1.42% to 9.75% (weighted average rate of 4.85% as of December 31, 2016), payable through 2028 | United Airlines, Inc.
Debt Instrument [Line Items]
Long-term Debt, Gross		7,586	7,971
Secured Debt | Notes payable, floating interest rates of the London Interbank Offered Rate ("LIBOR") plus 0.20% to 2.85%, payable through 2028 | United Airlines, Inc.
Debt Instrument [Line Items]
Long-term Debt, Gross		1,546	1,302
Secured Debt | Term Loan Facility Due April 2019 | United Airlines, Inc.
Debt Instrument [Line Items]
Long-term Debt, Gross		866	875
Secured Debt | Term Loan Facility Due September 2021 | United Airlines, Inc.
Debt Instrument [Line Items]
Long-term Debt, Gross		192	194
Unsecured Debt | 6% Senior Notes due 2020
Debt Instrument [Line Items]
Long-term Debt, Gross	[1]	300	300
Unsecured Debt | 6.375% Senior Notes due 2018
Debt Instrument [Line Items]
Long-term Debt, Gross	[1]	300	300
Unsecured Debt | Other Debt | United Airlines, Inc.
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 101	$ 100
[1] UAL is the issuer of this debt. United is a guarantor.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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