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Employee Retirement Plans - Defined Contribution Plans (Details) - Other Pension, Postretirement and Supplemental Plans - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Defined Contribution Plan Disclosure [Line Items]      
Costs of benefits under savings plans $ 23 $ 22 $ 21
Total fair values of grantor trust investment assets $ 8 $ 9