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RETIREMENT PLANS Tables (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 100.00% 100.00%  
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months $ 12    
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 12    
Defined Benefit Plan, Expected Future Benefit Payment, Year Three 12    
Defined Benefit Plan, Expected Future Benefit Payment, Year Four 13    
Defined Benefit Plan, Expected Future Benefit Payment, Year Five 13    
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter 66    
Defined Benefit Plan, Plan Assets, Amount 174 $ 147  
Cash refund (contribution) for the ERP settlement, net 0 9 $ (16)
(Gain) loss on settlement of the Esterline Retirement Plan (the “ERP”) $ 0 $ 9 $ (22)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 39 $ 29  
Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 47 40  
Fair Value Measured at Net Asset Value Per Share [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 88 $ 78  
Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 46.00% 42.70%  
Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 53.80% 56.00%  
Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 0.20% 1.30%  
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 1 $ 1 $ 1
Pension Plan [Member] | UNITED STATES      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 5.20% 5.25%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 6.00% 5.37%  
Defined Benefit Plan, Benefit Obligation $ 12 $ 12 15
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) 0 0  
Defined Benefit Plan, Service Cost 0 0 0
Defined Benefit Plan, Interest Cost 1 1 4
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 0 (1)  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (1) (3)  
Defined Benefit Plan, Plan Assets, Amount 9 8 9
Defined Benefit Plan, Benefit Obligations (12) (12)  
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) 0 0  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 1 11  
Defined Benefit Plan, Plan Assets, Contributions by Employer 1 (9)  
Defined Benefit Plan, Plan Assets, Benefits Paid (1) (3)  
Defined Benefit Plan, Funded (Unfunded) Status of Plan (3) (4)  
Assets for Plan Benefits, Defined Benefit Plan 0 0  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 0  
Liability, Defined Benefit Plan, Current 0 (1)  
Liability, Defined Benefit Plan, Noncurrent (3) (3)  
Liability, Defined Benefit Plan (3) (4)  
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax 1 1  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax 0 0  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax 1 1  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (1) 0 (6)
Defined Benefit Plan, Amortization of Gain (Loss) 0 0 0
Defined Benefit Plan, Benefit Obligation, Payment for Settlement 0 (9) 22
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 0 (8) 20
(Gain) loss on settlement of the Esterline Retirement Plan (the “ERP”) $ (9) $ (22)  
Pension Plan [Member] | Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.74% 5.56%  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 3.24% 3.19%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 5.42% 5.41%  
Defined Benefit Plan, Benefit Obligation $ 168 $ 144 148
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) 5 8  
Defined Benefit Plan, Service Cost 2 2 3
Defined Benefit Plan, Interest Cost 8 7 4
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 15 (13)  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (9) (8)  
Defined Benefit Plan, Plan Assets, Amount 165 139 133
Defined Benefit Plan, Benefit Obligations (168) (144)  
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) 5 6  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 25 6  
Defined Benefit Plan, Plan Assets, Contributions by Employer 5 2  
Defined Benefit Plan, Plan Assets, Benefits Paid (9) (8)  
Defined Benefit Plan, Funded (Unfunded) Status of Plan (3) (5)  
Assets for Plan Benefits, Defined Benefit Plan 13 12  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 3 0  
Liability, Defined Benefit Plan, Current 0 0  
Liability, Defined Benefit Plan, Noncurrent (16) (17)  
Liability, Defined Benefit Plan (3) (5)  
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax (1) 1  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax 4 1  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax 3 2  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (7) (7) (7)
Defined Benefit Plan, Amortization of Gain (Loss) 0 1 1
Defined Benefit Plan, Benefit Obligation, Payment for Settlement 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 3 $ 3 $ 1