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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Sep. 30, 2024
Variable Interest Entity [Line Items]    
Assets $ 9,777 $ 9,155
Liabilities 8,965 8,480
Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Assets 68 77
Liabilities $ 2 $ 2