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INTANGIBLE ASSETS - Summary of Changes in Carrying Value of Goodwill (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 8,988 $ 8,641
Goodwill, Acquired During Period 1,349 256
Purchase price allocation adjustments 35 7
Currency translation adjustments and other 47 84
Measurement Period Adjustments, Goodwill 35 7
Goodwill, Ending Balance 10,419 8,988
Power & Control    
Goodwill [Line Items]    
Goodwill, Beginning Balance 4,194 4,155
Goodwill, Acquired During Period 786 12
Purchase price allocation adjustments 0 4
Currency translation adjustments and other 40 23
Measurement Period Adjustments, Goodwill 0 4
Goodwill, Ending Balance 5,020 4,194
Airframe    
Goodwill [Line Items]    
Goodwill, Beginning Balance 4,701 4,393
Goodwill, Acquired During Period 563 244
Purchase price allocation adjustments 35 3
Currency translation adjustments and other 7 61
Measurement Period Adjustments, Goodwill 35 3
Goodwill, Ending Balance 5,306 4,701
Non-aviation    
Goodwill [Line Items]    
Goodwill, Beginning Balance 93 93
Goodwill, Acquired During Period 0 0
Purchase price allocation adjustments 0 0
Currency translation adjustments and other 0 0
Measurement Period Adjustments, Goodwill 0 0
Goodwill, Ending Balance $ 93 $ 93