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Debt - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2022 | Jun. 30, 2021
Debt Instrument [Line Items] |  |  |
Unamortized debt discount | $ 447 | $ 447 |
Proceeds from issuance of debt, net of discounts and fees |  | $ 212 | $ 11,116
Secured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from issuance of debt, net of discounts and fees | $ 220 |  |
Stated interest rate | 4.00% | 4.00% |
United Airlines, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from issuance of debt, net of discounts and fees |  | $ 212 | $ 11,116
Revolving Credit Facility | United Airlines, Inc. | Secured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Available under revolving credit facility | $ 1,750 | $ 1,750 |

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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 + Details
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