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Debt - Details of Pass Through Trusts (Details) - USD ($) | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Debt Instrument [Line Items] |  |
Total proceeds received from issuance of debt | $ 13,024,000,000 | $ 1,109,000,000
United Airlines, Inc. |  |
Debt Instrument [Line Items] |  |
Total proceeds received from issuance of debt | 13,024,000,000 | $ 1,109,000,000
Pass-Through Certificates | United Airlines, Inc. |  |
Debt Instrument [Line Items] |  |
Face Amount | 1,221,000,000 |
Total proceeds received from issuance of debt | 328,000,000 |
Total debt recorded | 1,221,000,000 |
Pass-Through Certificates | Class AA Pass-Through Certificates Issued September 2019 | United Airlines, Inc. |  |
Debt Instrument [Line Items] |  |
Face Amount | $ 702,000,000 |
Stated interest rate | 2.70% |
Total proceeds received from issuance of debt | $ 189,000,000 |
Total debt recorded | 702,000,000 |
Pass-Through Certificates | Class A Pass-Through Certificates Issued September 2019 | United Airlines, Inc. |  |
Debt Instrument [Line Items] |  |
Face Amount | $ 287,000,000 |
Stated interest rate | 2.90% |
Total proceeds received from issuance of debt | $ 77,000,000 |
Total debt recorded | 287,000,000 |
Pass-Through Certificates | Class B Pass-Through Certificates Issued September 2019 | United Airlines, Inc. |  |
Debt Instrument [Line Items] |  |
Face Amount | $ 232,000,000 |
Stated interest rate | 3.50% |
Total proceeds received from issuance of debt | $ 62,000,000 |
Total debt recorded | $ 232,000,000 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 + Details
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