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SEGMENTS - Net Sales and EBITDA Defined by Segment to Consolidated Income Before Taxes Operations (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues $ 8,831 $ 7,940 $ 6,585
Earnings before interest taxes depreciation and amortization 112 106 89
Depreciation and amortization expense 367 312 268
Interest expense-net 1,572 1,286 1,164
Acquisition transaction and integration-related expenses 42 70 18
Non-cash stock and deferred compensation expense 157 217 157
Refinancing costs 11 58 56
Other, net (18) 15 16
Income from continuing operations before income taxes 2,629 2,215 1,716
Operating Segments      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues 8,831 7,940 6,585
Earnings before interest taxes depreciation and amortization 4,872 4,279 3,484
Operating Segments | Commercial and non-aerospace OEM      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues 2,106 2,121 1,685
Operating Segments | Commercial and non-aerospace aftermarket      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues 2,804 2,508 2,186
Operating Segments | Defense      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues 3,761 3,146 2,562
Operating Segments | Power & Control      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues 4,559 3,966 3,339
Other segment expenses 1,964 1,715 1,459
Earnings before interest taxes depreciation and amortization 2,595 2,251 1,880
Depreciation and amortization expense 180 133 110
Operating Segments | Power & Control | Commercial and non-aerospace OEM      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues 926 841 696
Operating Segments | Power & Control | Commercial and non-aerospace aftermarket      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues 1,360 1,218 1,074
Operating Segments | Power & Control | Defense      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues 2,273 1,907 1,569
Operating Segments | Airframe      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues 4,112 3,809 3,094
Other segment expenses 1,902 1,847 1,547
Earnings before interest taxes depreciation and amortization 2,210 1,962 1,547
Depreciation and amortization expense 181 172 152
Operating Segments | Airframe | Commercial and non-aerospace OEM      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues 1,180 1,280 989
Operating Segments | Airframe | Commercial and non-aerospace aftermarket      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues 1,444 1,290 1,112
Operating Segments | Airframe | Defense      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues 1,488 1,239 993
Operating Segments | Non-aviation      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues 160 165 152
Other segment expenses 93 99 95
Earnings before interest taxes depreciation and amortization 67 66 57
Depreciation and amortization expense $ 6 $ 6 $ 5