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Derivative Financial Instruments - Schedule of Amounts Recorded in Consolidated Balance Sheet (Details) - Interest Rate Swap - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Other Current Assets:    
Derivatives, Fair Value [Line Items]    
Other assets $ 2 $ 2
Other Noncurrent Assets:    
Derivatives, Fair Value [Line Items]    
Other assets $ 0 $ 16