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PENSION & POSTRETIREMENT PLANS - Schedule of Pension and Postretirement Plan Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Retirement Benefits [Abstract]    
Service cost $ 18 $ 9
Interest cost 48 55
Expected return on plan assets (73) (74)
Net amortization 4 (14)
Total $ (3) $ (24)