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Pension and Postretirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (gain)   $ 8
Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost $ 1 1
Expected return on plan assets (2) (2)
Amortization of prior service credit (1) (1)
Net periodic benefit cost (2) (2)
United States | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 20 21
Expected return on plan assets (30) (34)
Net actuarial loss (gain) 0 8
Net periodic benefit cost (10) (5)
Foreign Plan | Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 4 3
Interest cost 17 16
Expected return on plan assets (18) (18)
Net periodic benefit cost $ 3 $ 1