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Accounting Policies Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2022
Cash and Cash Equivalents [Line Items]        
Cash and Cash Equivalents, at Carrying Value $ 501 $ 501    
Restricted Cash and Cash Equivalents, Noncurrent 20 20    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 521 $ 521 $ 520 $ 520