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COMMON STOCKHOLDERS' EQUITY AND PREFERRED SECURITIES - Summary of Warrants Outstanding (Details) - $ / shares shares in Millions | Dec. 31, 2024 | Aug. 31, 2024
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Class of Warrant or Right [Line Items] |  |
Number of Shares of UAL Common Stock (in shares) | 3,513,714.0 |
Exercise Price (in dollars per share) |  | $ 31.50
PSP2 Warrants |  |
Class of Warrant or Right [Line Items] |  |
Number of Shares of UAL Common Stock (in shares) | 2,011,924.0 |
Exercise Price (in dollars per share) | $ 43.26 |
PSP3 Warrants |  |
Class of Warrant or Right [Line Items] |  |
Number of Shares of UAL Common Stock (in shares) | 1,501,790.0 |
Exercise Price (in dollars per share) | $ 53.92 |

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