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Debt - Details of Pass Through Trusts (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Debt Instrument [Line Items] |  |  |
Proceeds received from issuance of debt | $ 646,000,000 | $ 673,000,000 | [1]
United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds received from issuance of debt | 646,000,000 | $ 673,000,000 | [2]
United Airlines, Inc. | Class AA Pass Through Certificates | February 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Principal | $ 717,000,000 |  |
Stated interest rate | 4.15% |  |
Total debt recorded | $ 522,000,000 |  |
Proceeds received from issuance of debt | 522,000,000 |  |
Remaining proceeds from issuance of debt to be received in future periods | 195,000,000 |  |
United Airlines, Inc. | Class A Pass Through Certificates | February 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Principal | $ 296,000,000 |  |
Stated interest rate | 4.55% |  |
Total debt recorded | $ 216,000,000 |  |
Proceeds received from issuance of debt | 216,000,000 |  |
Remaining proceeds from issuance of debt to be received in future periods | 80,000,000 |  |
United Airlines, Inc. | ETTC |  |  |
Debt Instrument [Line Items] |  |  |
Principal | 1,013,000,000 |  |
Total debt recorded | 738,000,000 |  |
Proceeds received from issuance of debt | 738,000,000 |  |
Remaining proceeds from issuance of debt to be received in future periods | $ 275,000,000 |  |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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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- 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 cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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