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Segment, Geographic and Revenue Information - Investment Management Investments Revenues - Net Unrealized Carried Interest (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Segment Reporting [Abstract]
Net cumulative unrealized performance-based fees at risk of reversing	$ 924	$ 796

X

- Definition

Amount of accrued revenue earned by the entity based on the investment results achieved, net of any reversals.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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