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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024
Variable Interest Entity [Line Items]
Assets	$ 9,146	$ 9,155
Liabilities	8,449	8,480
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	66	77
Liabilities	$ 2	$ 2

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