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Accounting Policies Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Cash and Cash Equivalents [Line Items]        
Cash and Cash Equivalents, at Carrying Value $ 507 $ 502    
Restricted Cash and Cash Equivalents, Noncurrent 21 21    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 553 $ 523 $ 518 $ 521