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LEASES - Supplemental Cash Flow Information Related to Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Leases [Abstract]    
Operating Lease, Payments $ 23 $ 21
Finance Lease, Interest Payment on Liability 16 14
Finance Lease, Principal Payments 7 6
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 25 21
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability $ 25 $ 83