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SEGMENTS - Total Assets, Capital Expenditures and Depreciation and Amortization by Segment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]      
Total assets $ 22,909 $ 25,586 $ 19,970
Capital expenditures 222 165 139
Depreciation and amortization expense 367 312 268
Operating Segments | Power & Control      
Segment Reporting Information [Line Items]      
Total assets 9,859 9,180 7,356
Capital expenditures 108 90 67
Depreciation and amortization expense 180 133 110
Operating Segments | Airframe      
Segment Reporting Information [Line Items]      
Total assets 10,267 10,045 8,972
Capital expenditures 103 73 65
Depreciation and amortization expense 181 172 152
Operating Segments | Non-aviation      
Segment Reporting Information [Line Items]      
Total assets 202 193 193
Capital expenditures 9 2 6
Depreciation and amortization expense 6 6 5
Corporate      
Segment Reporting Information [Line Items]      
Total assets 2,581 6,168 3,449
Capital expenditures 2 0 1
Depreciation and amortization expense $ 0 $ 1 $ 1