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Pension and Postretirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]        
Net actuarial loss (gain)   $ 15   $ 23
Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost $ 1 1 $ 2 2
Expected return on plan assets (2) (2) (4) (4)
Amortization of prior service credit (2) (1) (3) (2)
Net periodic benefit cost (3) (2) (5) (4)
United States | Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 19 20 39 41
Expected return on plan assets (30) (33) (60) (67)
Net actuarial loss (gain) 0 15 0 23
Settlement loss 0 1 0 1
Net periodic benefit cost (11) 3 (21) (2)
Foreign Plan | Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 4 4 8 7
Interest cost 17 17 34 33
Expected return on plan assets (18) (19) (36) (37)
Net periodic benefit cost $ 3 $ 2 $ 6 $ 3