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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Information about Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Goodwill $ 4,527 $ 4,527
Indefinite-lived intangible assets    
Gross  Carrying Amount 2,581 2,591
Finite-lived intangible assets    
Gross  Carrying Amount 1,465 1,629
Accumulated Amortization 1,363 1,495
Frequent flyer database    
Finite-lived intangible assets    
Gross  Carrying Amount 1,177 1,177
Accumulated Amortization 1,092 1,068
Hubs    
Finite-lived intangible assets    
Gross  Carrying Amount 145 145
Accumulated Amortization 138 131
Other    
Finite-lived intangible assets    
Gross  Carrying Amount 143 307
Accumulated Amortization 133 296
China route authority    
Indefinite-lived intangible assets    
Gross  Carrying Amount 1,020 1,020
Airport slots    
Indefinite-lived intangible assets    
Gross  Carrying Amount 564 574
Tradenames and logos    
Indefinite-lived intangible assets    
Gross  Carrying Amount 593 593
Alliances    
Indefinite-lived intangible assets    
Gross  Carrying Amount $ 404 $ 404