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Common Stockholders' Equity and Preferred Securities - Summary of Warrants Outstanding (Details) shares in Millions | Dec. 31, 2023 $ / shares shares
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Class of Warrant or Right [Line Items] |
Number of Shares of UAL Common Stock (in shares) | 10.0
PSP1 Warrants |
Class of Warrant or Right [Line Items] |
Number of Shares of UAL Common Stock (in shares) | 4.8
Exercise Price (in dollars per share) | $ / shares | $ 31.50
CARES Act Warrants |
Class of Warrant or Right [Line Items] |
Number of Shares of UAL Common Stock (in shares) | 1.7
Exercise Price (in dollars per share) | $ / shares | $ 31.50
PSP2 Warrants |
Class of Warrant or Right [Line Items] |
Number of Shares of UAL Common Stock (in shares) | 2.0
Exercise Price (in dollars per share) | $ / shares | $ 43.26
PSP3 Warrants |
Class of Warrant or Right [Line Items] |
Number of Shares of UAL Common Stock (in shares) | 1.5
Exercise Price (in dollars per share) | $ / shares | $ 53.92

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-3 + Details
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