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Employee Retirement Plans - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]      
ABO $ 21 $ 24  
Fair value of plan assets 25 22  
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Contribution made to Pension Plan 15 19  
Defined benefit plan, benefit obligation 692 707 $ 623
Payments for defined benefit retirement plan 38 37  
Supplemental Employee Retirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, benefit obligation 26 40  
Payments for defined benefit retirement plan 16 0 0
Consolidated balance sheets 23 31  
Other Pension, Postretirement and Supplemental Plans      
Defined Benefit Plan Disclosure [Line Items]      
Consolidated balance sheets 8 8  
Costs of benefits under savings plans 24 23 22
U.S. | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Contribution made to Pension Plan 13 $ 18 $ 18
Expected future employer contributions to pension plan $ 18