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REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Billions | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Revenue from Contract with Customer [Abstract] |  |
Revenue recognized that was previously deferred | $ 6.2 | $ 6.2
Cash sales of mileage credits | $ 6.0 | $ 5.5
Redemption period for majority of new miles (in years) | 2 years |

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- Definition Mileage Credit Redemption, Majority Of New Miles Redemption Period + References No definition available. + Details
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- Definition Sales Of Mileage Credits + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
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Period Type: | duration

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- References No definition available. + Details
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