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SEGMENTS - Capital Expenditures and Depreciation and Amortization by Segment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]      
Capital expenditures $ 165 $ 139 $ 119
Depreciation and amortization expense 312 268 253
Operating Segments | Power & Control      
Segment Reporting Information [Line Items]      
Capital expenditures 90 67 63
Depreciation and amortization expense 133 110 109
Operating Segments | Airframe      
Segment Reporting Information [Line Items]      
Capital expenditures 73 65 52
Depreciation and amortization expense 172 152 138
Operating Segments | Non-aviation      
Segment Reporting Information [Line Items]      
Capital expenditures 2 6 3
Depreciation and amortization expense 6 5 5
Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Capital expenditures 0 1 1
Depreciation and amortization expense $ 1 $ 1 $ 1