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ACQUISITIONS - Other Acquisitions (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Business Combination [Line Items]      
Acquisition of businesses, net of cash acquired $ 419 $ 2,347 $ 762
GOODWILL $ 10,612 10,419 $ 8,988
Minimum      
Business Combination [Line Items]      
Estimated useful life of aircraft (in years) 25 years    
Maximum      
Business Combination [Line Items]      
Estimated useful life of aircraft (in years) 30 years    
Other Acquisitions      
Business Combination [Line Items]      
Acquisition of businesses, net of cash acquired $ 285 314  
GOODWILL 126 182  
Other intangible assets $ 90 $ 116  
Goodwill and Intangible Assets, Deductible For Tax Purposes, Term 15 years 15 years  
Amount of goodwill expected to be tax deductible $ 126 $ 49  
Business acquisition, intangible assets, expected tax deductible amount $ 90 $ 22