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Employee Retirement Plans - Expected Payments for Pension Benefits and Other Postretirement Welfare Benefits (Details) - Pension Benefits
$ in Millions
Sep. 30, 2023
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Fiscal 2024 $ 39
Fiscal 2025 39
Fiscal 2026 41
Fiscal 2027 43
Fiscal 2028 44
Fiscal 2029 - 2033 $ 238