Regulatory Requirements - U.S. Broker-Dealer Regulatory Capital Requirements (Details) - MS&Co. - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Regulatory Requirements
Net capital	$ 14,886	$ 18,383
Excess net capital	$ 10,405	$ 14,208

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