Collateralized Transactions - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Offsetting [Abstract]
Offset of other secured financing liabilities against trade assets	$ 1,473	$ 3,472

Trading Asset, Subject to Master Netting Arrangement, Asset Offset

No definition available.

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