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Pension and Postretirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost $ 1 $ 1
Expected return on plan assets (3) (2)
Amortization of prior service credit (1) (1)
Net periodic benefit cost (3) (2)
United States | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 16 20
Expected return on plan assets (24) (30)
Net periodic benefit cost (8) (10)
Foreign Plan | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 4 4
Interest cost 16 17
Expected return on plan assets (19) (18)
Net periodic benefit cost $ 1 $ 3