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Debt - Interest Expense, net (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Debt Disclosure [Abstract]      
Interest expense, net $ 141 $ 125 $ 122
Interest expense, debt $ 157 $ 125 $ 119
Long-term debt, weighted average interest rate, at point in time 4.10% 3.50% 3.20%