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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 30, 2023
Variable Interest Entity [Line Items]
Assets	$ 8,991	$ 8,545
Liabilities	8,375	8,115
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	74	5
Liabilities	$ 2	$ 2

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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