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GOODWILL AND INTANGIBLE ASSETS - Summary of Changes in Carrying Value of Goodwill (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 10,419 $ 8,988
Goodwill, Acquired During Period 202 1,349
Purchase price allocation adjustments (38) 35
Currency translation adjustments and other 29 47
Goodwill, Ending Balance 10,612 10,419
Power & Control    
Goodwill [Line Items]    
Goodwill, Beginning Balance 5,034 4,208
Goodwill, Acquired During Period 189 786
Purchase price allocation adjustments 18 0
Currency translation adjustments and other 32 40
Goodwill, Ending Balance 5,273 5,034
Airframe    
Goodwill [Line Items]    
Goodwill, Beginning Balance 5,306 4,701
Goodwill, Acquired During Period 13 563
Purchase price allocation adjustments (56) 35
Currency translation adjustments and other (3) 7
Goodwill, Ending Balance 5,260 5,306
Non-aviation    
Goodwill [Line Items]    
Goodwill, Beginning Balance 79 79
Goodwill, Acquired During Period 0 0
Purchase price allocation adjustments 0 0
Currency translation adjustments and other 0 0
Goodwill, Ending Balance $ 79 $ 79