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REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Revenue From Contract With Customer [Line Items] |  |  |
Expiration period for refundable tickets | 1 year |  |
Expiration period for advance ticket sales | 12 months |  |
Revenue | $ 57,063 | $ 53,717 | $ 44,955
Period over which miles are expected to be redeemed | two years |  |
Minimum |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Term for frequent flyer mileage sales to partners | 1 year |  |
Maximum |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Term for frequent flyer mileage sales to partners | 5 years |  |
Advance Ticket Sales |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Revenue recognized | $ 5,300 | 5,700 | 3,300
Ancillary Fees Recorded within Passenger Revenues |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Revenue | 4,500 | 4,100 | 3,400
Other operating revenue |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Revenue | 3,491 | 3,176 | 2,752
Other operating revenue | Chase and Other Partner Agreements |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Revenue | $ 2,900 | $ 2,700 | $ 2,400

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