Financial Instruments Subject to Off-Balance Sheet Credit Risk - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Securities Financing Transaction, Fair Value
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value of borrowed securities from other broker-dealers to fulfill short sales by clients	$ 853	$ 685

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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