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REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Revenue From Contract With Customer [Line Items] |  |
Total operating revenue | $ 13,213 | $ 12,539
Advance Ticket Sales |  |
Revenue From Contract With Customer [Line Items] |  |
Revenue recognized | 4,300 | 4,000
Ancillary Services |  |
Revenue From Contract With Customer [Line Items] |  |
Total operating revenue | 1,000 | 984
Other Operating Revenue |  |
Revenue From Contract With Customer [Line Items] |  |
Total operating revenue | 923 | 835
Other Operating Revenue | Chase and Other Partner Agreements |  |
Revenue From Contract With Customer [Line Items] |  |
Total operating revenue | $ 774 | $ 714

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