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LEASES - Maturities of Lease Liabilities Operating and Financing (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Leases [Abstract]    
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months $ 19  
Lessee, Operating Lease, Liability, Payments, Due Year Two 16  
Lessee, Operating Lease, Liability, Payments, Due Year Three 12  
Lessee, Operating Lease, Liability, Payments, Due Year Four 9  
Lessee, Operating Lease, Liability, Payments, Due Year Five 5  
Lessee, Operating Lease, Liability, Payments, Due after Year Five 20  
Lessee, Operating Lease, Liability, Payments, Due 81  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 15  
Operating Lease, Liability 66 $ 62
Finance Lease, Liability, Payments, Due Next Twelve Months 22  
Finance Lease, Liability, Payments, Due Year Two 26  
Finance Lease, Liability, Payments, Due Year Three 25  
Finance Lease, Liability, Payments, Due Year Four 25  
Finance Lease, Liability, Payments, Due Year Five 27  
Finance Lease, Liability, Payments, Due after Year Five 437  
Finance Lease, Liability, Payment, Due 562  
Finance Lease, Liability, Undiscounted Excess Amount 278  
Finance lease obligations $ 284 $ 262