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Benefit Plans - Net Pension and Other Postretirement Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]      
Net pension cost $ 84 $ 65 $ 98
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 34 88 91
Interest cost 123 139 129
Expected return on plan assets (163) (150) (141)
Amortization of prior service credit 0 (4) (7)
Amortization of loss 31 57 58
Settlement and curtailment loss, net 44 1 44
Net pension cost 68 131 174
International plans | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Net pension cost $ 33 $ 28 $ 25