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Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Retirement Benefits [Abstract]      
Employee benefit plan obligation $ 51 $ 83  
Aggregate pension liability recorded in balance sheet 35 58  
Pension expense 3 4 $ 4
Employers contribution plan expense $ 12 $ 9 $ 8