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Debt - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 30, 2017	Dec. 31, 2016
5% Senior Notes due 2024
Debt Instrument [Line Items]
Debt instrument stated interest rate		5.00%
United Airlines, Inc.
Debt Instrument [Line Items]
Borrowed principal amount		$ 369,000,000
United Airlines, Inc. | Minimum
Debt Instrument [Line Items]
Debt instrument maturity year		2026
United Airlines, Inc. | Maximum
Debt Instrument [Line Items]
Debt instrument maturity year		2028
United Airlines, Inc. | Surety Bond
Debt Instrument [Line Items]
Credit facility outstanding amount		$ 383,000,000
Credit facility expiration year		2021
United Airlines, Inc. | Pass-through certificates
Debt Instrument [Line Items]
Long term debt		$ 7,500,000,000
United Airlines, Inc. | 5% Senior Notes due 2024 | Subsequent Event
Debt Instrument [Line Items]
Borrowed principal amount	$ 300,000,000
Debt instrument maturity date	Feb. 01, 2024
Debt instrument stated interest rate	5.00%
Notes repurchase price	101.00%
United Airlines, Inc. | Revolving Credit Facility
Debt Instrument [Line Items]
Commitment fee percentage		0.75%
United Airlines, Inc. | Letters of credit | Cash Collateralized Letters of Credit
Debt Instrument [Line Items]
Credit facility outstanding amount		$ 72,000,000
United Airlines, Inc. | Secured Debt
Debt Instrument [Line Items]
Quarterly principal repayment amount		0.25%
United Airlines, Inc. | Secured Debt | Term Loan Facility Due April 2019
Debt Instrument [Line Items]
Borrowed principal amount		$ 900,000,000
Long term debt		$ 866,000,000
Debt instrument maturity date		Apr. 01, 2019
United Airlines, Inc. | Secured Debt | Term Loan Facility Due September 2021
Debt Instrument [Line Items]
Borrowed principal amount		$ 500,000,000
Long term debt		$ 192,000,000
Debt instrument maturity date		Sep. 15, 2021
United Airlines, Inc. | Secured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Credit agreement		$ 1,350,000,000
Available under revolving credit facility		$ 1,350,000,000
United Airlines, Inc. | Secured Debt | Revolving Credit Facility | Term Loan, due 2021 | LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		3.00%
United Airlines, Inc. | Secured Debt | Revolving Credit Facility | Term Loan, due 2021 | Certain Market Interest Rates
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		2.00%
United Airlines, Inc. | Secured Debt | Revolving Credit Facility Available For Drawing until April 2018
Debt Instrument [Line Items]
Credit agreement		$ 1,350,000,000
Revolving credit facility available for drawing date		2018-04
United Airlines, Inc. | Secured Debt | Revolving Credit Facility Available For Drawing until January 2019
Debt Instrument [Line Items]
Credit agreement		$ 1,315,000,000
Revolving credit facility available for drawing date		2019-01

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Debt instrument maturity year

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Line of Credit Facility Expiration Dates

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Line Of Credit Facility Maturity Year

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Longterm Debt Maturities Repayments of Principal in Quarterly Installments Percent

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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