Financial Instruments Subject to Off-Balance Sheet Credit Risk - Narrative (Details) - USD ($) $ in Billions	Mar. 31, 2024	Dec. 31, 2023
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	$ 1.8	$ 1.5

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.

No definition available.

Name:	us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration