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Pension and Postretirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]        
Net actuarial loss (gain) $ (6) $ 87 $ 17 $ 104
Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 1 0 3 1
Expected return on plan assets (3) (3) (7) (7)
Amortization of prior service credit (1) (1) (3) (3)
Net periodic benefit cost (credit) (3) (4) (7) (9)
United States | Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 21 17 62 38
Expected return on plan assets (34) (37) (101) (119)
Net actuarial loss (gain) (6) 106 17 124
Settlement loss 0 2 1 3
Net periodic benefit cost (credit) (19) 88 (21) 46
Foreign Plan | Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 4 5 11 16
Interest cost 18 10 51 30
Expected return on plan assets (20) (20) (57) (62)
Net actuarial loss (gain) 0 (19) 0 (20)
Settlement loss 0 (1) 0 7
Net periodic benefit cost (credit) $ 2 $ (25) $ 5 $ (29)