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Debt - Narrative (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 29, 2017 | Sep. 30, 2017 | Jan. 31, 2017 | Dec. 31, 2018
4.25% Senior Notes due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed interest rate |  |  |  | 4.25%
5% Senior Notes due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed interest rate |  |  |  | 5.00%
United Airlines, Inc. |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  |  |  | $ 424,000,000
United Airlines, Inc. | Pass-Through Certificates |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long term debt |  |  |  | 8,800,000,000
United Airlines, Inc. | 4.25% Senior Notes due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  | $ 400,000,000 |  |
Debt instrument maturity date |  | Oct. 01, 2022 |  |
Fixed interest rate |  | 4.25% |  |
Notes repurchase price |  | 101.00% |  |
United Airlines, Inc. | 5% Senior Notes due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  |  | $ 300,000,000 |
Debt instrument maturity date |  |  | Feb. 01, 2024 |
Fixed interest rate |  |  | 5.00% |
Notes repurchase price |  |  | 101.00% |
United Airlines, Inc. | Surety Bond |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility outstanding amount |  |  |  | $ 418,000,000
Credit facility expiration year |  |  |  | 2022
United Airlines, Inc. | Letters of Credit | Cash Collateralized Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility outstanding amount |  |  |  | $ 73,000,000
United Airlines, Inc. | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Quarterly principal repayment amount | 0.25% |  |  |
United Airlines, Inc. | Secured Debt | Term Loan due April 1, 2024 | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.75% |  |  |
United Airlines, Inc. | Secured Debt | Term Loan due April 1, 2024 | Alternative Rate Based on Certain Market Interest Rates |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 0.75% |  |  |
United Airlines, Inc. | Secured Debt | Term Loan due April 1, 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount | $ 1,500,000,000 |  |  |
Debt instrument maturity date | Apr. 01, 2024 |  |  |
United Airlines, Inc. | Secured Debt | Revolving Credit Facility Available for Drawing until April 1, 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit agreement | $ 2,000,000,000 |  |  |
Revolving credit facility available for drawing date | Apr. 01, 2022 |  |  |
United Airlines, Inc. | Secured Debt | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitment fee percentage |  |  |  | 0.75%
Available under revolving credit facility |  |  |  | $ 2,000,000,000
United Airlines, Inc. | Secured Debt | Revolving Credit Facility | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  |  |  | 2.25%
United Airlines, Inc. | Secured Debt | Revolving Credit Facility | Alternative Rate Based on Certain Market Interest Rates |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  |  |  | 1.25%

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- Definition Longterm Debt Maturities Repayments of Principal in Quarterly Installments Percent + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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