v3.25.1
REVENUE RECOGNITION - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
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