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Collateralized Transactions - Customer Margin Lending (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Collateralized Agreements [Abstract]
Margin and other lending	$ 69,570	$ 55,882

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- Definition

Receivables generated from margin lending activities that are collateralized by customer-owned securities held by the entity.

+ References

No definition available.

+ Details

Name:	ms_MarginLendingReceivables
Namespace Prefix:	ms_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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