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INTANGIBLE ASSETS - Schedule of Intangible Assets Acquired (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Acquired Finite-Lived Intangible Assets [Line Items]    
Goodwill $ 1,349 $ 256
Intangible assets not subject to amortization 1,491  
Intangible assets subject to amortization 680  
intangible Assets, Acquired During the Period 2,171  
Goodwill    
Acquired Finite-Lived Intangible Assets [Line Items]    
Goodwill 1,349  
Trademarks and trade names    
Acquired Finite-Lived Intangible Assets [Line Items]    
Intangible assets not subject to amortization 142  
Technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Intangible assets subject to amortization $ 366  
Amortization Period (in years) 20 years  
Order backlog    
Acquired Finite-Lived Intangible Assets [Line Items]    
Intangible assets subject to amortization $ 56  
Order backlog | Minimum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Amortization Period (in years) 1 year  
Order backlog | Maximum    
Acquired Finite-Lived Intangible Assets [Line Items]    
Amortization Period (in years) 3 years  
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Intangible assets subject to amortization $ 258  
Amortization Period (in years) 20 years