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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	Jun. 30, 2024	Sep. 30, 2023
Variable Interest Entity [Line Items]
Assets	$ 8,830	$ 8,545
Liabilities	8,195	8,115
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	72	5
Liabilities	$ 2	$ 2

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