Intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Schedule of Assets Sold with Retained Exposure Schedule of Bilateral Equity Derivatives [Table Text Block] Tabular disclosure of bilateral equity derivatives, which the entity retains to the exposure to the underlying securities. Fair Value disclosure Fair Value Disclosure [Line Items] Cash collateral netting Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset Award Timing Predetermined Award Timing Predetermined [Flag] Borrowings Fair Value Option Aggregate Differences Debt This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of debt instruments that have contractual principal amounts and for which the fair value option has been elected. Proportional amortization Investment Program, Proportional Amortization Method, Applied, Amortization Expense Entity File Number Entity File Number Credit Net derivatives: Credit Credit Risk Contract [Member] Additional paid-in capital Additional Paid-in Capital [Member] Amounts not offset Security Borrowed, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Tabular List, Table Tabular List [Table Text Block] Remaining repayment term, weighted average in years Due from Employees, Repayment Terms The repayment terms for dues from employees. Debt and Equity Interests Securities (Assets) [Member] Securities sold under agreements to repurchase Securities Loaned or Sold under Agreements to Repurchase [Member] Trading assets at fair value ($283,742 and $213,269 pledged as collateral) Total trading assets Trading assets Trading Assets, Fair Value Disclosure Fair value portion of assets pertaining to principal and customer trading transactions, or which may be incurred with the objective of generating a profit from short- term fluctuations in price as part of an entity's market-making, hedging and proprietary trading. Maximum potential payout/notional Guarantor Obligations, Maximum Exposure, Undiscounted Common stock issued to employee stock trusts Common Stock Issued, Employee Stock Trust Institutional Securities Advisory Investment Advice [Member] Global Medium-Term Notes, Series A, Floating Rate Notes Due 2029 Global Medium-Term Notes, Series A, Floating Rate Notes Due 2029 of Morgan Stanley Finance LLC [Member] Global Medium-Term Notes, Series A, Floating Rate Notes Due 2029 of Morgan Stanley Finance LLC Measurement Basis [Axis] Measurement Basis [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Securities loaned Interest Expense, Securities Loaned Interest Expense, Securities Loaned OCI Other Comprehensive Income (Loss) [Member] Schedule of Trading Revenues by Product Type Schedule of Trading Revenues by Product Type [Table Text Block] Tabular disclosure of trading revenues by product or group of similar products. Gain (Loss) on Fair Value Hedges Recognized in Interest Expense Summary of Fair Value Hedge Activity [Abstract] Transfers of assets accounted for as secured financings Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount One-notch downgrade Derivative, Credit Risk Related Contingent Features, Triggering Circumstances, One-notch Credit Rating Downgrade [Member] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Recoveries Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Credit Protection Sold Credit Derivatives, Selling Protection [Member] A credit derivative in which one party makes periodic payments to the other and receives the promise of a pay-off if a third party defaults. Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Schedule of Other Secured Financings Schedule of Other Secured Financing [Table Text Block] Tabular disclosures of other secured financings including their types and maturities. Gains (losses) from fair value remeasurements Net revenues Fair Value, Option, Changes in Fair Value, Gain (Loss) Cash collateral netting Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Schedule of Gains (Losses) on Accounting Hedges Schedule of Accounting Hedges, Statements of Financial Performance, Location [Table Text Block] Tabular disclosure for accounting hedges of the location and amount of gains and losses reported in the statement of financial performance. Schedule of Cash and Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Regulatory Minimum (as a percent) Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum SCB Banking Regulation, Stress Capital Buffer [Abstract] Banking Regulation, Stress Capital Buffer Adjustment to Compensation, Amount Adjustment to Compensation Amount Consolidation Consolidation, Policy [Policy Text Block] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Derivative assets Derivative Asset, Notional Amount Credit Default Swap Model Credit Default Swap Model [Member] Credit Default Swap Model [Member] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Corporate equities Corporate Equities [Member] Corporate Equities [Member] Interest Income and Interest Expense Interest Income and Interest Expense Disclosure [Text Block] Asset Pledged as Collateral without Right Asset Pledged as Collateral without Right [Member] HTM securities: Annualized average yield, after 10 year (as a percent) Held-to-maturity Securities Debt Maturities After Ten Years Annualized Average Yield Total Morgan Stanley shareholders’ equity Equity, Attributable to Parent Debt Securities, Available-for-Sale [Table] Debt Securities, Available-for-Sale [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Other comprehensive income (loss), net of tax: Reclassified to Earnings: Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] HTM securities: Net carrying amount, total Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date Common stock authorized (shares) Common Stock, Shares Authorized Preferred stock Preferred stock carrying value Preferred Stock, Carrying Value Call price of preferred stock plus any dividends in arrears times total number of preferred stock outstanding. Schedule of Fair Value Asset (Liability) of Credit Protection Sold Schedule Of Fair Value Asset (Liability) Of Credit Protection Sold [Table Text Block] Schedule Of Fair Value Asset (Liability) Of Credit Protection Sold HTM securities: Amortized cost, due within 1 year Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Less Allowance for Credit Loss Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Less Allowance for Credit Loss Financial assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Margin and other lending Margin Lending Receivables Receivables generated from margin lending activities that are collateralized by customer-owned securities held by the entity. Segregated securities Securities Reserve Deposit Required and Made Recurring Fair Value, Recurring [Member] Securities-based lending and Other SBL and Other Securities-Based Lending and Other Loans [Member] Securities-Based Lending and Other Loans [Member] Cover [Abstract] Cover [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Investment securities—HTM Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss Maximum Maximum [Member] AFS: Fair value, total Debt Securities, Available-for-Sale, Unrealized Loss Position AFS securities: Amortized cost, after 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Total Investment-related Liabilities Securities borrowed Securities Borrowed, Not Subject to Master Netting Arrangement Measured Based on Net Asset Value Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] Unrealized losses (gains) Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) Investment grade Internal Investment Grade [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Employee loans, net of ACL Due from Employees, Net of Allowance Amounts due from an Entity employees, net of allowance. Borrowings (includes $137,633 and $132,479 at fair value) Borrowings Total Debt, Long-Term and Short-Term, Combined Amount Greater than or equal to 740 FICO Score, Greater than or Equal to 740 [Member] FICO Score, Greater than or Equal to 740 [Member] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation Other secured financings (includes $17,533 and $16,871 at fair value) Other secured financings Total Other Secured Financings Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount 2022 Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Weighted average term increase from modification Financing Receivable, Modified, Weighted Average Term Increase from Modification Income before provision for income taxes Income before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Tier 1 leverage (as a percent) Banking Regulation, Tier 1 Leverage Capital Ratio, Actual Leveraged-based capital Leveraged Based Capital [Abstract] Leveraged Based Capital Variable Interest Entity, by Product Group [Axis] Variable Interest Entity, by Product Group [Axis] Securities purchased under agreements to resell Federal Funds Sold and Securities Purchased under Agreements to Resell Proceeds from issuance of Borrowings Proceeds from Issuance of Debt Bond Price Measurement Input, Bond Price [Member] Basis adjustments included in carrying amount—Terminated hedges Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Equity Volatility Skew Measurement Input, Equity Volatility Skew [Member] Measurement Input, Equity Volatility Skew Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Interest expense Total interest expense Interest Expense, Operating AFS securities: Annualized average yield including the interest rate swap accrual of related hedge (as a percent) Available-for-sale Securities, Debt Maturities, Annualized Average Yield Including the Interest Rate Swap Accrual of Related Hedges Available-for-sale securities, Debt Maturities, Annualized Average Yield Including the Interest Rate Swap Accrual of Related Hedges Schedule of Unsettled Fair Value of Futures Contracts Schedule of Unsettled Fair Value of Future Contracts [Table Text Block] Tabular disclosure of unsettled fair value of future contracts that are primarily classified as Level 1 in the fair value hierarchy, actively traded, and valued based on quoted prices from the exchange. Customer and other receivables Other receivables Other Receivables Liquidity facilities Liquidity Facilities Guarantee [Member] Liquidity Facilities Guarantee Document Fiscal Period Focus Document Fiscal Period Focus Derivative Assets and Liabilities Derivatives, Fair Value [Line Items] Schedule of Fair Value Option Fair Value Option, Disclosures [Table Text Block] Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Nonaccrual loans Financing Receivable, Excluding Accrued Interest, Nonaccrual Schedule of Investment Banking Revenues Schedule Of Institutional Securities Revenues [Table Text Block] Schedule of Institutional Securities Revenues [Table Text Block] Available-for-sale, amortized cost AFS securities: Amortized cost, total Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss Award Type Award Type [Axis] Foreign Currency Translation Adjustment Attributable to Parent Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] Gross Unrealized Gains Investment Securities Accumulated Gross Unrealized Gain Before Tax Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments securities. Investment, Name [Domain] Investment, Name [Domain] Trading Symbol Trading Symbol Client clearing guarantees Clearing Member Guarantee [Member] Clearing Member Guarantee [Member] Other liabilities and accrued expenses Accrued Liabilities and Other Liabilities Whole loan sales guarantees Whole Loan Sales Representations and Warranties [Member] Whole Loan Sales Representations and Warranties Asset management Asset Management Fees Amount of fee revenue for the management of an investment fund portfolio, including performance-based fees. Entity Address, City or Town Entity Address, City or Town Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Time Deposit Maturities Maturities of Time Deposits [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Common Equity Tier 1 capital (as a percent) Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual Advanced (as a percent) Banking Regulation, Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum, Advanced Banking Regulation, Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum, Advanced Floating or Adjustable Rate Financing Receivable including Held-for-Sale with Variable Rates of Interest Financing Receivable including Held-for-Sale with Variable Rates of Interest Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] IR Correlation Measurement Input, Interest Rate Correlation [Member] Collateralized Agreements [Abstract] Collateralized Agreements [Abstract] Forward points excluded from hedge effectiveness testing—Recognized in Interest income Gain (loss) on derivative recognized in other revenues Derivative, Gain (Loss) on Derivative, Net Carrying Amount Asset (Liability) Guarantor Obligations, (Assets) Current Carrying Value Guarantor Obligations, (Assets) Current Carrying Value AFS securities: Annualized average yield, after 5 years through 10 years (as a percent) Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Annualized Average Yield Annualized average yield of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Restricted cash Restricted Cash and Cash Equivalent Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Total non-interest revenues Noninterest Income Common stock outstanding (shares) Common Stock, Shares, Outstanding Schedule of AFS and HTM Securities Marketable Securities [Table Text Block] Gross Unrealized Losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Non-interest expenses Noninterest Expense [Abstract] Cash and due from banks Cash and Due from Banks Income tax credits and other income tax benefits Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization Expense Two-notch downgrade Derivative Credit Risk Related Contingent FeaturesTriggering Circumstances Two Notch Credit Rating Downgrade [Member] Transfer of Financial Assets Accounted for as Sales [Table] Transfer of Financial Assets Accounted for as Sales [Table] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Loans to non-U.S. borrowers, net Geographic Distribution, Foreign [Member] Gross Amounts Securities sold under agreements to repurchase Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement HTM securities: Fair value, after 1 year through 5 years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Derivatives, Fair Value Derivative, Fair Value, Net [Abstract] Less than 5 years Nonredeemable Funds, Maturity, within Next Five Years, at Carrying Value Carrying value of nonredeemable funds maturing in next five fiscal years following latest fiscal year. 3-5 (years) Other Commitment, to be Paid, Year Four and Five Pledged Status [Domain] Pledged Status [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Provision for income taxes Income Tax Expense (Benefit) Required Ratio Leveraged-Based Required Ratio [Abstract] Leveraged-Based Required Ratio Allowance for lending commitments rollforward Off-balance-sheet Loan Commitments, Allowance for Credit Exposures [Roll Forward] Equity Equity and Index Contract [Member] Derivative instrument whose primary underlying risk is tied to share prices and share indices. Other assets Other Assets Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Document Information [Line Items] Document Information [Line Items] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Designated as accounting hedges Designated as Hedging Instrument [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Net change in cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Total RWA Banking Regulation, Risk-Weighted Assets, Actual HTM securities: Fair value, due within 1 year Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Physical commodities Investment in Physical Commodities, Fair Value Disclosure Index and basket CDS Total Index and Basket Credit Default Swaps [Member] Schedule of Deposits Deposit Liabilities [Table Text Block] Tabular disclosure of deposit liability. Interest in Variable Interest Entity [Domain] Interest in Variable Interest Entity [Domain] Schedule of Guarantor Obligations [Table] Guarantor Obligation [Table] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Tier 1 capital ratio Banking Regulation, Tier 1 Risk-Based Capital [Abstract] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Regulatory Requirements Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Over 5 (years) Other Commitment, to be Paid, after Year Five Other Noninterest Income, Other Operating Income Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Schedule of Customer Margin Lending Schedule of Margin Loans [Table Text Block] Tabular disclosure of customer margin loans, which are collateralized by customer-owned securities held by the entity. Financing Receivable, Modified [Line Items] Financing Receivable, Modified [Line Items] Financing Receivable, Modified [Line Items] Other secured financings Other Secured Financings [Member] Other Secured Financings [Member] Net cash provided by (used for) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Proceeds from sales Proceeds from Sale of Debt Securities, Available-for-Sale Available-for-sale at fair value (amortized cost of $112,050 and $112,522) Investment securities—AFS Fair Value AFS securities: Fair value, total Debt Securities, Available-for-Sale, Excluding Accrued Interest Forward Natural Gas Price Forward Natural Gas Price [Member] Forward Natural Gas Price Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Schedule of Net Derivative Liabilities and Collateral Posted Schedule of Net Derivative Liabilities and Collateral Posted [Table Text Block] Schedule of Net Derivative Liabilities and Collateral Posted Equity Method Investments Schedule of Equity Method Investments [Line Items] Net interest Interest Income (Expense), Operating Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Tier 1 capital Banking Regulation, Tier 1 Risk-Based Capital, Actual Cash flow hedges - Interest rate contracts Interest Rate Cash Flow Hedges [Abstract] Well-Capitalized Requirement Ratio [Abstract] Well-Capitalized Requirement Ratio [Abstract] Well-Capitalized Requirement Ratio [Abstract] Derivative liabilities recognized in the balance sheet Derivative Liability, Subject to Master Netting Arrangement, before Offset Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Equity Components [Axis] Equity Components [Axis] ACL for loans to nonaccrual HFI loans Financing Receivable, Allowance for Credit Loss to Nonaccrual, Percent Three Years Ago Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Standby letters of credit and other financial guarantees issued Standby Letters of Credit [Member] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Less than 1 (year) Other Commitment, to be Paid, Year One Variable Interest Entities and Securitization Activities [Abstract] Variable Interest Entities and Securitization Activities [Abstract] SPE Special Purpose Entities [Member] Special Purpose Entities [Member] Number of Reportable Segments Number of Reportable Segments AOCI Attributable to Noncontrolling Interest AOCI Attributable to Noncontrolling Interest [Member] Nonderivative trading liabilities Nonderivative Trading Liabilities [Member] Nonderivative Trading Liabilities [Member] Tier 1 capital (as a percent) Tier One Risk Based Well-Capitalized Required for Capital Adequacy to Risk Weighted Assets Tier One Risk Based Well-Capitalized Required for Capital Adequacy to Risk Weighted Assets Entity Address, State or Province Entity Address, State or Province Interest income Total interest income Interest and Dividend Income, Operating Financial Asset, Period Past Due [Domain] Financial Asset, Aging [Domain] Common stock dividends Common stock dividends Dividends, Common Stock Brokerage, clearing and exchange fees Floor Brokerage, Exchange and Clearance Fees Additional Disclosures Additional Disclosures [Abstract] Individual: Individual [Axis] Schedule of Other Expenses - Transaction Taxes Schedule of Other Expenses, Transaction Taxes [Table Text Block] Schedule of Other Expenses, Transaction Taxes Advanced (as a percent) Banking Regulation, Capital Buffer Requirement, Advanced Banking Regulation, Capital Buffer Requirement, Advanced Schedule of Net Unrealized Carried Interest and Reduction of Fees due to Fee Waivers Schedule of Performance-based Fees [Table Text Block] Tabular disclosure of performance-based fees, including information on fee waivers and net unrealized fees. Maximum exposure to loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Principal Forgiveness Principal Forgiveness [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Entity Interactive Data Current Entity Interactive Data Current Advanced (as a percent) Banking Regulation, Global Systemically Important Bank (GSIB) Surcharge, Advanced Banking Regulation, Global Systemically Important Bank (GSIB) Surcharge, Advanced Schedule of Transferred Assets with Continuing Involvement Transfer of Financial Assets Accounted for as Sales [Table Text Block] Regulatory Minimum (as a percent) Banking Regulation, Tier One Risk-Based Capital Ratio, Regulatory Minimum Banking Regulation, Tier One Risk-Based Capital Ratio, Regulatory Minimum Trading assets pledged to various parties Trading Assets, Pledged as Collateral, at Fair Value The fair value as of the balance sheet date of trading assets pledged to counterparties as collateral. Interest income Interest and Dividend Income, Operating [Abstract] Total non-interest expenses Noninterest Expense Tranched index and basket Tranched Index and Basket Credit Default Swap [Member] Fair value of securities purchased under agreement to resell Securities purchased under agreements to resell Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Fair value Transfer Of Financial Assets, Assets Sold With Retained Exposure [Abstract] Transfer Of Financial Assets, Assets Sold With Retained Exposure [Abstract] Other-than-insignificant Payment Delay Payment Deferral [Member] Deposits Interest Expense, Deposits Schedule of Maximum Potential Payout/Notional of Credit Protection Sold Schedule Of Maximum Potential Payout/Notional Of Credit Protection Sold [Table Text Block] Schedule Of Maximum Potential Payout/Notional Of Credit Protection Sold Net income applicable to noncontrolling interests Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest Debt securities, trading assets, measurement input value Debt Securities, Trading, Measurement Input Cross-Commodity Correlation Measurement Input, Cross-Commodity Correlation [Member] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Corporate Loan Model Valuation Technique, Corporate Loan Model [Member] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Balance Sheet Captions Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Pre-tax margin Effective Income Tax Rate Reconciliation, Pre-tax Margin, Percent Effective Income Tax Rate Reconciliation, Pre-tax Margin, Percent Schedule of Loans Held for Investment Financing Receivable Credit Quality Indicators [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Schedule of Employee Loans [Table] Schedule of Employee Loans [Table] Schedule of Employee Loans [Table] Secured lending facilities Secured Lending Facilities [Member] Secured Lending Facilities Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Unfunded equity contributions Investment Program, Proportional Amortization Method, Elected, Commitment Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Netting Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset Schedule of Accrued Interest Schedule Of Accrued Interest [Table Text Block] Schedule of Accrued Interest [Table Text Block] Exercise Price Award Exercise Price ACL Due From Employees, Allowance Due From Employees, Allowance Entity Filer Category Entity Filer Category Standardized (as a percent) Tier 1 capital (as a percent) Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum Class of Stock [Domain] Class of Stock [Domain] Standardized (as a percent) Banking Regulation, Stress Capital Buffer, Standardized Banking Regulation, Stress Capital Buffer, Standardized Debt and equity interests Debt and Equity Interests [Member] Debt and Equity Interests [Member] Schedule of Employee Loans Schedule of Due from Employees [Table Text Block] Tabular disclosure of due from Entity employees. Total ending balance Allowance For Credit Loss And Exposures Allowance For Credit Loss And Exposures Preferred Stock Dividends Dividends, Preferred Stock [Abstract] Basis adjustments included in amortized cost/ carrying amount Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) Fair Value Option, Disclosures [Table] Fair Value Option, Disclosures [Table] Non-compensation expenses Noninterest Expense excluding Labor and Related Expense Noninterest Expense excluding Labor and Related Expense Debt-to-Value [Domain] Debt-to-Value [Domain] Pre-tax Reclass. Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Accumulated other comprehensive income (loss) AOCI Attributable to Parent [Member] Trading liabilities at fair value Trading liabilities at fair value Financial Instruments Sold, Not yet Purchased, at Fair Value Investments [Domain] Investments [Domain] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Exit Multiple Measurement Input, Exit Multiple [Member] Measurement input using the ratio of Enterprise Value to EBITDA, where Enterprise Value is the aggregate value of equity and debt minus cash and cash equivalents. The exit multiple reflects the value of the company in terms of its full-year expected EBITDA at exit. Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Bond price Trading Liabilities, Fair Value Disclosure, Measurement Input Trading Liabilities, Fair Value Disclosure, Measurement Input Pension and Other Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member] Other liabilities and accrued expenses—Lending commitments Other Liabilities [Member] Fair Value as of Grant Date Award Grant Date Fair Value Four Years Ago Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Financing Receivable, Modified, Subsequent Default [Line Items] Financing Receivable, Modified, Subsequent Default [Line Items] Total Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Compensation and benefits Labor and Related Expense SPE assets (UPB) Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding Non-agency CMBS Mortgage-Backed Securities, Issued by Private Enterprises [Member] Tier 1 leverage (as a percent) Banking Regulation, Tier 1 Leverage Capital Ratio, Capital Adequacy, Minimum Investments Principal Investment Gain (Loss) SLR3,4 Supplemental Leverage Capital The numerator of supplementary leverage ratio. It's a banking organization's tier 1 capital, which includes all on-balance-sheet assets. Document Quarterly Report Document Quarterly Report Greater than 80% Debt-to-Value Ratio, Greater than 80 Percent [Member] Debt-to-Value Ratio, Greater than 80 Percent [Member] AFS: Fair value, less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Tier 1 capital (as a percent) Banking Regulation, Tier 1 Risk-Based Capital Ratio, Actual Deposits Deposit Liabilities Disclosures [Text Block] Schedule of Valuation Techniques and Unobservable Inputs Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 680-739 FICO Score, Between 680 and 739 [Member] FICO Score, Between 680 and 739 [Member] Warehouse Model Valuation Technique, Warehouse Model [Member] Schedule of Protection Purchased with CDS Schedule Of Protection Purchased With CDS [Table Text Block] Schedule Of Protection Purchased With CDS AFS securities: Annualized average yield, due within 1 year (as a percent) Available-for-sale Securities, Debt Maturities, Next Twelve Months, Annualized Average Yield Annualized average yield of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Total Loans Loans and Leases Receivable, Net Amount [Abstract] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Employee stock trusts Capital Accumulation Plans Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] AFS securities: Annualized average yield, after 10 years (as a percent) Available-for-sale Securities, Debt Maturities, after Ten Years, Annualized Average Yield Annualized average yield of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Other derivatives Not Designated as Hedging Instrument, Trading [Member] Schedule of Net Asset Value Measurements Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block] Investment Type [Axis] Investment Type [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] Loans: HFI Loans Financing Receivable, after Allowance for Credit Loss [Abstract] Non-PEO NEO Non-PEO NEO [Member] Customer receivables and Other Interest Income, Other Forward Power Price Measurement Input, Forward Power Price [Member] Trading Trading revenues Trading Gain (Loss) Percent of loans to total loans Financing Receivable, Loans Held for Investment by Loan Type to Total Loans Held for Investment, Percent Financing Receivable, Loans Held for Investment by Loan Type to Total Loans Held for Investment Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Change in net debt valuation adjustment Other Comprehensive (Income) Loss, Debt Valuation Adjustment, Net of Tax Amount after tax and reclassification adjustments, of debt valuation adjustment related to outstanding liabilities under the fair value option election. Derivative liabilities Derivative Liability, Notional Amount Overnight and Open Maturity Overnight [Member] Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax All Award Types Award Type [Domain] Recognized in OCI Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Changes in loans, net Payments for (Proceeds from) Loans Receivable Net revenues Net revenues Revenues, Net of Interest Expense Equity Awards Adjustments Equity Awards Adjustments [Member] Excluded tax equity investments Investment, Proportional Amortization Method, Not Elected, Amount Investment, Proportional Amortization Method, Not Elected, Amount Over 90 Days Maturity Greater than 90 Days [Member] Other operating adjustments Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Derivative and other contracts Derivative Financial Instruments, Liabilities [Member] Customer and other payables Payables Payables are amounts due to various parties arising from transactions between the entity and these parties: customers; brokers, dealers and clearing organizations; and interest and dividends. Foreign exchange Net derivatives: Foreign exchange Foreign Exchange Contract [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Estimate of Fair Value Measurement [Member] 30-89 days past due Financial Asset, 30 To 89 Days Past Due [Member] Financial Asset, 30 To 89 Days Past Due MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] AFS securities: Amortized cost, after 1 year through 5 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Fair Value Option Quantitative Disclosures Fair Value, Option, Quantitative Disclosures [Line Items] Amounts not offset Security Loaned, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset HTM securities: HTM Securities [Abstract] HTM Securities Standardized (as a percent) Banking Regulation, Capital Buffer Requirement Banking Regulation, Capital Buffer Requirement Revenues Revenues [Abstract] Value of mortgage pass-through certificates Certificates Allegedly Sponsored, Underwritten, And, Or, Sold Certificates Allegedly Sponsored, Underwritten, And, Or, Sold 2030 Time Deposit Maturities, Year Four AFS securities: Amortized cost, after 5 years through 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Credit Derivatives by Maturity [Domain] Credit Derivatives by Maturity [Domain] Credit Derivatives by Maturity [Domain] Schedule of Carrying Value of Assets Loaned or Pledged Without Counterparty Right to Sell or Repledge Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block] Total proportional amortization method investment Investment, Proportional Amortization Method, Elected, Amount Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Other income Investment Program, Proportional Amortization Method, Elected, Other Income Tax Benefit, before Amortization Expense Investment Program, Proportional Amortization Method, Elected, Other Income Tax Benefit, before Amortization Expense AFS securities: Annualized average yield, total (as a percent) Available-for-sale Securities, Debt Maturities, Annualized Average Yield Annualized average yield of debt securities categorized neither as held-to-maturity nor trading. Financial Instruments [Domain] Financial Instruments [Domain] Change in net unrealized gains (losses) on available-for-sale securities OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax HTM securities: Fair value, after 10 years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Non-Cumulative Preferred Stock, Series P, $0.01 par value Series P Series P Preferred Stock [Member] Series P Preferred Stock Employment Status [Domain] Employment Status [Domain] [Domain] for Employment Status [Axis] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases EMEA EMEA [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Portion of Unrealized losses (gains) recorded in OCI—Change in net DVA Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) Securities sold under agreements to repurchase Securities Sold under Agreements to Repurchase, Not Subject to Master Netting Arrangement Minimum Minimum [Member] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Banking Regulation, Regulatory Capital Requirement, Compliance [Table] Total loans Financing Receivable including Held-for-Sale, before Allowance for Credit Loss Financing Receivable including Held-for-Sale, before Allowance for Credit Loss Cash and cash equivalents Interest Income, Cash and Cash Equivalents Interest Income, Cash and Cash Equivalents Loans Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Fair Value Measurement [Domain] Fair Value Measurement [Domain] HTM securities: Annualized average yield, total (as a percent) Held-to-maturity Securities Debt Maturities Annualized Average Yield Annualized average yield categorized as held-to-maturity. Borrowings and Other Secured Financings Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Assets Assets [Member] Deposits subject to FDIC insurance Cash, FDIC Insured Amount Past due Financial Asset, Past Due Minus Current [Member] Financial Asset, Past Due Minus Current [Member] Collateral [Domain] Collateral Held [Domain] Commitments, Guarantees and Contingencies Commitments and Contingencies Disclosure [Text Block] Diluted (shares) Weighted average common shares outstanding and common stock equivalents, diluted (shares) Weighted Average Number of Shares Outstanding, Diluted Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Derivative [Table] Derivative [Table] Customer and other receivables (payables), net Derivative Asset, Fair Value, Unsettled Unsettled fair value of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both. Financing Receivable, Modified [Table] Financing Receivable, Modified [Table] Financing Receivable, Modified [Table] Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Preferred stock shares outstanding (shares) Preferred Stock, Shares Outstanding Currently employed by the Firm Currently Employed by the Firm [Member] Currently Employed by the Firm [Member] Document Transition Report Document Transition Report AFS securities: Fair value, after 1 year through 5 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Loan Restructuring Modification Name [Axis] Loan Restructuring Modification Name [Axis] Underlying Securities Award Underlying Securities Amount Pre-Tax Gain (Loss) Other Comprehensive Income (Loss), before Reclassifications, before Tax Gross realized gains Debt Securities, Available-for-Sale, Realized Gain Cumulative pre-tax DVA gain (loss) recognized in AOCI Unrealized Gain (Loss) on Debt Valuation Adjustment, Pretax, Accumulated Other Comprehensive Income (Loss) Amount of unrealized gain (loss) related to debt valuation adjustment, which was recorded in accumulated other comprehensive income. Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Investment banking Investment Banking Revenue Income Taxes Income Tax Disclosure [Text Block] Financial Instrument, Owned, Pledged Status [Extensible Enumeration] Financial Instrument, Owned, Pledged Status [Extensible Enumeration] Amortized cost, unalloccated basis adjustment Amortized cost, unalloccated basis adjustment Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Fair Value, Cumulative Increase (Decrease) Common Stock, $0.01 par value Common Class A [Member] Fee waivers Investment Company, Regulatory Fee Waived Amount of fee waived by investment company to comply with regulatory requirements. Geographic Distribution [Domain] Geographic Distribution [Domain] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Net derivative liabilities with credit risk-related contingent features Derivative, Net Liability Position, Aggregate Fair Value Net amounts Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Gross Unrealized Losses Investment Securities Accumulated Gross Unrealized loss Before Tax Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments securities. Annualized Average Yield Available-for-sale Securities, Debt Maturities, Annualized Average Yield, Fiscal Year Maturity [Abstract] Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Schedule of Assets by Business Segment Reconciliation of Assets from Segment to Consolidated [Table Text Block] Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Additional paid-in capital Additional Paid in Capital Marketing and business development Marketing and Advertising Expense Product and Service [Axis] Product and Service [Axis] Litigation Status [Domain] Litigation Status [Domain] Common Equity Tier 1 capital (as a percent) Tier One Risk Based Common Capital Well-Capitalized Required For Capital Adequacy To Risk Weighted Assets Tier One Risk Based Common Capital Well-Capitalized Required For Capital Adequacy To Risk Weighted Assets Brokers and Dealers [Abstract] Broker-Dealer [Abstract] Investment grade percentage Debt Securities, Held-to-Maturity, Investment Grade, Percent Debt Securities, Held-to-Maturity, Investment Grade, Percent Statistical Measurement [Axis] Statistical Measurement [Axis] Securities borrowed Interest Income, Securities Borrowed Interest Income, Securities Borrowed Schedule of Fair Value of Collateral Received with Right to Sell or Repledge Schedule of Customer Securities for which Entity has Right to Sell or Repledge [Table Text Block] Gross Amounts Securities Borrowed, Gross Including Not Subject to Master Netting Arrangement Authorized repurchase amount of outstanding common stock Share Repurchase Program, Authorized, Amount Credit Score, FICO [Domain] Credit Score, FICO [Domain] Amounts for which master netting agreements are not in place or may not be legally enforceable, included in Net Amounts Collateralized Transactions Not Subject to Legally Enforceable Master Netting Agreements [Abstract] Valuation Techniques and Sensitivity of Unobservable Inputs Used in Level 3 Fair Value Measurements Fair Value Measurement Inputs and Valuation Techniques [Line Items] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Debt-to-Value [Axis] Debt-to-Value [Axis] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Leveraged-based capital ratio Banking Regulation, Leverage Ratio [Abstract] Maximum length of time over which forecasted cash flows are hedged Derivative, Term of Contract Summary of Net Benefits Attributable to Tax Equity Investments under the Proportional Amortization Met Investment Program, Proportional Amortization Method, Elected, Schedule Of Income Tax Credit And Other Income Tax Benefits [Table Text Block] Investment Program, Proportional Amortization Method, Elected, Schedule Of Income Tax Credit And Other Income Tax Benefits Earnings applicable to Morgan Stanley common shareholders Net Income (Loss) Available to Common Stockholders, Basic Lending commitments Written Loan Commitment, Fair Value Option [Member] Standby letters of credit Long-Term Line of Credit Level 1 Fair Value, Inputs, Level 1 [Member] Securities purchased under agreements to resell Securities Purchased under Agreements to Resell, Not Subject to Master Netting Arrangement Diluted (USD per share) Earnings Per Share, Diluted SLR (as a percent) Banking Regulation, Supplementary Leverage Ratio, Actual AFS securities: Fair value, after 5 years through 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Schedule of Gross Realized Gains (Losses) on Sales of AFS Securities Schedule of Realized Gain (Loss) [Table Text Block] Other secured financings Proceeds from (Repayments of) Other Secured Financings The net cash inflow (outflow) associated with other secured financing. AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Securities purchased under agreements to resell Interest Income (Paid), Securities Purchased under Agreements to Resell Interest Income (Paid), Securities Purchased under Agreements to Resell Gross cash proceeds from sale of assets Transfer of Financial Assets Accounted for as Sales, Amount Derecognized Fixed 2.5% buffer Banking Regulation, Capital Conservation Buffer [Abstract] Total loans Financing Receivable, Held-for-Sale Corporate Commercial Loan [Member] Common stock held in treasury (shares) Treasury Stock, Common, Shares WACC Measurement Input, Weighted Average Cost of Capital [Member] Measurement input using weighted average cost of capital (WACC), which theoretically represents the required rate of return to debt and equity investors. Consolidation Items [Domain] Consolidation Items [Domain] Loans and lending commitments Senior Debt Obligations [Member] Securities Financing Transaction [Table] Security Financing Transaction [Table] Securities loaned Securities Loaned [Abstract] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Other Assets Equity Method Investments and Joint Ventures Disclosure [Text Block] Term Extension Extended Maturity [Member] Amounts Offset Security Borrowed, Subject to Master Netting Arrangement, Liability Offset Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Letters of credit and other financial guarantees Commitments, Letters of Credit and Other Financial Guarantees Obtained to Satisfy Collateral Requirements [Member] Financial Instruments Owned and Pledged as Collateral [Line Items] Financial Instruments Owned and Pledged as Collateral [Line Items] Other net increases (decreases) Stockholders' Equity, Other Number of certificates dismissed Number of Certificates Dismissed Number of Certificates Dismissed Carrying Value of Nonredeemable Funds by Contractual Maturity Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Period [Abstract] Investment Management Investment Management Segment Investment Management Segment [Member] Investment Management business segment. Variable Interest Entity, Product Group [Domain] Variable Interest Entity, Product Group [Domain] 2027 Time Deposit Maturities, Year One Net benefits included in income tax expense Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, after Amortization Expense Cash payments for income taxes, net of refunds Income Taxes Paid, Net 1-3 (years) Other Commitment, to be Paid, Year Two and Three Bilateral OTC Over-the-Counter [Member] Borrowings Borrowings [Abstract] Borrowings [Abstract] Schedule of Regulatory Capital and Capital Ratios Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Derivative assets, measurement input value Derivative Asset, Measurement Input Total Total Past due loans Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Third party guarantees (as a percent) Available-for-sale Securities, Third Party Guarantees, Percent Percent of third party guarantees against loss of value in the underlying assets related to available-for-sale security. DVA AOCI, Debt Valuation Adjustment, Noncontrolling Interest [Member] AOCI, Debt Valuation Adjustment, Noncontrolling Interest [Member] Securities sold under agreements to repurchase (includes $699 and $696 at fair value) Securities sold under agreements to repurchase Balance Sheet Net Amounts Securities Sold under Agreements to Repurchase Schedule of Revenue Recognized from Prior Services Revenue Remaining Performance Obligation [Table Text Block] Revenue Remaining Performance Obligation [Table Text Block] Intersegment Eliminations Intersegment Eliminations [Member] Schedule of AFS Securities in an Unrealized Loss Position Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Expiration Date Trading Arrangement Expiration Date Hedged asset, unallocated basis adjustment Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Fair Value, Cumulative Increase (Decrease), Excluded from Amortized Cost Other Commitments [Domain] Other Commitments [Domain] Non-Cumulative Preferred Stock, Series Q, $0.01 par value Series Q Series Q Preferred Stock [Member] Series Q Preferred Stock Equity Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Other sovereign government obligations Debt Security, Government, Non-US [Member] AFS securities: Annualized average yield including the interest rate swap accrual of related hedges, due within 1 year (as a percent) Available-for-sale securities, Debt Maturities, Next Twelve Months, Annualized Average Yield Including the Interest Rate Swap Accrual of Related Hedges Available-for-sale securities, Debt Maturities, Next Twelve Months, Annualized Average Yield Including the Interest Rate Swap Accrual of Related Hedges Allowance for credit loss related to held-to-maturity securities Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest Funding period Investment Program, Proportional Amortization Method, Elected, Commitment, Funding Period Investment Program, Proportional Amortization Method, Elected, Commitment, Funding Period Other assets—Other investments Other Investments [Member] Schedule of Equity Method Investments Equity Method Investments [Table Text Block] Investments Investments [Member] Net investment hedges—Foreign exchange contracts Effect of Net Investment Hedge on Results of Operations [Abstract] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] ACL for loans to total HFI loans Financing Receivable, Allowance for Credit Loss to Outstanding, Percent Asia Asia [Member] Entity Current Reporting Status Entity Current Reporting Status Non-Cumulative Preferred Stock, Series A, $0.01 par value Series A Series A Preferred Stock [Member] Derivative [Line Items] Derivative [Line Items] Other assets—Premises, equipment and software Payments for (Proceeds from) Productive Assets Amounts not offset Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Revenue from External Customers by Products and Services [Table] Segment Reporting, Revenue from External Customer, Product and Service [Table] Collateral [Axis] Collateral Held [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] AFS securities: Amortized cost, due within 1 year Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Capital conservation buffer requirement Banking Regulation, Capital Buffer Requirement [Abstract] Banking Regulation, Capital Buffer Requirement Total gross derivatives Derivative Liability, Gross Liability Including Not Subject to Master Netting Arrangement Transaction [Domain] Transaction [Domain] CTA Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member] Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] AFS: Gross unrealized losses, 12 months or longer Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Hedge Hedge Funds [Member] Borrowings Repayments of Debt Market Approach Valuation, Market Approach [Member] Current Fiscal Year End Date Current Fiscal Year End Date Gross unrealized gains, unallocated basis adjustment Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Accumulated Gross Unrealized Gain, Before Tax, Cumulative Increase (Decrease) Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Accumulated Gross Unrealized Gain, Before Tax, Cumulative Increase (Decrease) AFS: Gross unrealized losses, less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Deposits (includes $8,593 and $8,755 at fair value) Deposits Total Deposits Trading liabilities— Obligation to return securities received as collateral Obligation to Return Securities Received as Collateral Schedule of Loans by Type Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule of Obligations under Guarantee Arrangements Schedule of Guarantor Obligations [Table Text Block] Schedule of Gross Secured Financing Balances Schedule of Securities Financing Transactions [Table Text Block] Professional services Professional Fees Credit Derivatives, Protection [Axis] Credit Derivatives, Protection [Axis] Derivative and other contracts Total in Trading liabilities Derivative liabilities Derivative Liability Schedule of Broker-Dealer Regulatory Capital Requirements Futures Commission Merchant, Minimum Financial Requirement [Table Text Block] HFS Loans Receivable, Held-for-Sale [Abstract] Other Other Noninterest Expense Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Interest rate Net derivatives: Interest rate Interest rates Interest Rate Contract [Member] Amounts for which master netting or collateral agreements are not in place or may not be legally enforceable, included in Net amounts Derivative Asset, Not Subject to Master Netting Arrangement MUMSS Mitsubishi UFJ Morgan Stanley Securities Co., Ltd [Member] Mitsubishi UFJ Morgan Stanley Securities Co., Ltd New transactions Cash Flows Between Transferor and Transferee, Proceeds from New Transfers AFS: Gross unrealized losses, total Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Non-Cumulative Preferred Stock, Series I, $0.01 par value Series I Series I Preferred Stock [Member] Corporate equities Equity Securities, FV-NI, Current Cash and Cash Equivalents [Abstract] Cash and Cash Equivalents [Abstract] Weighted average antidilutive common stock equivalents (excluded from the computation of diluted EPS) (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Average common shares outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] Liabilities at Fair Value Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-Maturity Securities [Line Items] 5-10 years Nonredeemable Funds, Maturity, after Five Through Ten Years, at Carrying Value Carrying value of nonredeemable funds maturing in sixth through tenth fiscal year following latest fiscal year. Other Commitments [Table] Other Commitments [Table] Net cash provided by (used for) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Measure: Measure [Axis] Other consumer or commercial loans Other Consumer and Commercial Loans [Member] Change in Fair Value of Cash Flow Hedge Derivatives Attributable to Parent AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Standardized (as a percent) Banking Regulation, Global Systemically Important Bank (GSIB) Surcharge HTM securities Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] SLR (as a percent) Minimum Supplementary Leverage Ratio The minimum percentage of tier one capital to total leverage exposure, as defined by regulatory framework. Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Net proceeds from (payments for): Net Proceeds From (Payments For) [Abstract] Net Proceeds from (Payments for) [Abstract] Total capital ratio Banking Regulation, Total Capital [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Entity Tax Identification Number Entity Tax Identification Number Discounted Cash Flow Valuation Technique, Discounted Cash Flow [Member] Schedule of Consolidated VIEs Schedule of Variable Interest Entities [Table Text Block] Non-credit derivatives Derivative [Member] Common stock issued (shares) Common Stock, Shares, Issued Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, after Amortization, Statement of Cash Flows [Extensible Enumeration] Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, after Amortization, Statement of Cash Flows [Extensible Enumeration] Commercial mortgages CML Commercial Mortgage-Backed Securities [Member] Allowance for loan losses rollforward Allowance for Loan and Lease Losses [Roll Forward] Agency CMBS U.S. agency collateralized mortgage obligations U.S. Agency CMO Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] Securities sold under agreements to repurchase Increase (Decrease) in Payables under Repurchase Agreements Amounts not offset Security Purchased under Agreement to Resell, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Cash Flow Hedges Accumulated Other Comprehensive Income (Loss), Derivative Qualifying as Hedge, Excluded Component, Including Portion Attributable to Noncontrolling Interest [Member] Loss Contingencies Loss Contingencies [Line Items] Loans and other receivables Fair Value, Option, Aggregate Differences, Loans and Long-Term Receivables Borrowings, measurement input value Debt Instrument, Measurement Input Realized and unrealized losses (gains) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Non-Cumulative Preferred Stock, Series E, $0.01 par value Series E Series E Preferred Stock [Member] Security Exchange Name Security Exchange Name Standardized (as a percent) Common Equity Tier 1 capital (as a percent) Tier One Risk Based Common Capital Required for Capital Adequacy to Risk Weighted Assets The minimum common equity Tier One Capital Ratio (Common equity Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. Securities purchased under agreements to resell (includes $— and $— at fair value) Balance Sheet Net Amounts Securities Purchased under Agreements to Resell MS&Co. M S and Co. [Member] Morgan Stanley & Co. LLC Loans, Lending Commitments and Related Allowance for Credit Losses Financing Receivables [Text Block] Preferred stock dividends Preferred stock dividends declared Dividends, Preferred Stock Series M Series M Preferred Stock [Member] Series M Preferred Stock Employee Loans [Line Items] Employee Loans [Line Items] HTM securities: Amortized cost, after 5 year through 10 years Debt Securities, Held-To-Maturity, Maturity, Allocated And Single Maturity Date, Rolling After Five Through Ten Years, Amortized Cost Less Allowance For Credit Loss Debt Securities, Held-To-Maturity, Maturity, Allocated And Single Maturity Date, Rolling After Five Through Ten Years, Amortized Cost Less Allowance For Credit Loss Realized and unrealized gains (losses) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Statement [Line Items] Statement [Line Items] HTM securities: Annualized average yield, due within 1 year (as a percent) Held-to-maturity Securities Debt Maturities Next Twelve Months Annualized Average Yield Annualized average yield of Held-to-maturity securities maturing in the next fiscal year following the latest fiscal year. Amortized cost basis/ carrying amount currently or previously hedged Hedged Asset, Fair Value Hedge Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Total Cash and cash equivalents Cash and Cash Equivalent Retained interests Retained Interest, Fair Value Disclosure Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Investment activities Commitments, Investment Activities [Member] Commitment associated with its real estate, private equity and principal investment activities, which include alternative products. Central counterparty Central Counterparty Commitment [Member] Central Counterparty Commitment [Member] Common stock Common Stock [Member] Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances Payments for: Net Payments For Financing Activities [Abstract] Net Payments for: [Abstract] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Effect of dilutive RSUs and PSUs (shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Schedule of Selected Credit Ratios Financing Receivable, Credit Ratio [Table Text Block] 90+ days past due Financial Asset, 90+ Days Past Due [Member] Financial Asset, 90+ Days Past Due Amounts Offset Security Purchased under Agreement to Resell, Subject to Master Netting Arrangement, Liability Offset DVA AOCI, Debt Valuation Adjustment, Including Noncontrolling Interest [Member] AOCI, Debt Valuation Adjustment, Including Noncontrolling Interest Guarantees Guarantor Obligations [Line Items] Significant Accounting Policies Significant Accounting Policies [Text Block] Amortized cost Beneficial Interest, Portfolio Layer Method, Amortized Cost Statistical Measurement [Domain] Statistical Measurement [Domain] Schedule of Notionals of Derivative Contracts Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Underlying Asset Class [Axis] Underlying Asset Class [Axis] Trading assets, net of Trading liabilities Interest Income, Trading Assets Net of Trading Liabilities Interest income earned on instruments and other positions owned by the entity that are for trading purposes, offset by interest expense incurred on trading liabilities. Series N Series N Preferred Stock [Member] Series N Preferred Stock Offset of other secured financing liabilities against trade assets Trading Asset, Subject to Master Netting Arrangement, Asset Offset Trading Asset, Subject to Master Netting Arrangement, Asset Offset Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Advanced (as a percent) Banking Regulation, Countercyclical Capital Buffer, Advanced Banking Regulation, Countercyclical Capital Buffer, Advanced Income (loss) Income (loss) from investment in MUMSS Income (Loss) from Equity Method Investments Corporate and other debt Corporate and Other Debt Securities [Member] Corporate and Other Debt Securities [Member] Other Financing Receivable, Excluding Accrued Interest, Allowance for Credit Losses, Other Amount of other addition (reduction) in allowance reserve for credit loss. Securities loaned Balance Sheet Net Amounts Securities Loaned Schedule of Common Stock Dividends Per Share Dividends Declared [Table Text Block] Nonaccrual loans without an ACL Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance Customer and other payables and other liabilities Increase (Decrease) in Accounts Payable Pledged Status [Axis] Pledged Status [Axis] Wealth Management Segment Wealth Management1 Wealth Management Segment [Member] Wealth Management business segment. General partner guarantees General Partner Guarantee [Member] General Partner Guarantee Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] 2026 Time Deposit Maturities, Remainder of Fiscal Year Basic (USD per share) Earnings Per Share, Basic Liabilities at fair value Liabilities Liabilities, Fair Value Disclosure [Abstract] Schedule of Fair Values of Derivative Asset Contracts Schedule of Derivative Assets at Fair Value [Table Text Block] Preferred stock dividend declared (USD per share) Preferred Stock, Dividends Per Share, Declared Fair Value Hedges - Hedged Items Accounting Standards Update 2017-12 [Abstract] Incremental collateral or termination payments upon potential future ratings downgrade Additional Collateral, Aggregate Fair Value Total included in the offsetting disclosure Securities Loaned and Securities Sold under Agreement to Repurchase, Gross Including Not Subject to Master Netting Arrangement Total other comprehensive income (loss) Net change in Accumulated other comprehensive income (loss) Net OCI Activity Other Comprehensive Income (Loss), Net of Tax Schedule of Selected Financial Information by Business Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Non-Consolidated VIEs Schedule of Non-Consolidated Variable Interest Entities [Table Text Block] Schedule of Non-Consolidated Variable Interest Entities. HTM securities: Amortized cost, after 1 year through 5 years Debt Securities, Held-To-Maturity, Maturity, Allocated And Single Maturity Date, Rolling After One Through Five Years, Amortized Cost Less Allowance For Credit Loss Debt Securities, Held-To-Maturity, Maturity, Allocated And Single Maturity Date, Rolling After One Through Five Years, Amortized Cost Less Allowance For Credit Loss Schedule of Fair Values of Derivative Liability Contracts Schedule of Derivative Liabilities at Fair Value [Table Text Block] Gross Unrealized Gains Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Lending commitments Loans and Lending Commitments Loans and lending commitments are mainly related to relationship-based and event-driven lending to select corporate clients. Relationship-based loans and lending commitments are used for general corporate purposes, working capital and liquidity purposes by our investment banking clients and typically consist of revolving lines of credit, letter of credit facilities and term loans. EBITDA Multiple Measurement Input, EBITDA Multiple [Member] Deposits at fair value Deposits Deposits, Fair Value Disclosure Net benefits Investment Program Proportional Amortization Method Elected Income Tax Credit And Other Income Tax Benefit After Amortization Expense Including Other Income Investment Program Proportional Amortization Method Elected Income Tax Credit And Other Income Tax Benefit After Amortization Expense Including Other Income Measurement Input Type [Domain] Measurement Input Type [Domain] Advanced (as a percent) Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum, Advanced Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum, Advanced Unrealized gains (losses) Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Schedule of Nonrecurring Fair Value Measurements Fair Value Measurements, Nonrecurring [Table Text Block] Gross charge-offs Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Information processing and communications Communications and Information Technology Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Real estate Real Estate Funds [Member] Net Amounts Security Purchased under Agreement to Resell, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Interest Income (Expense), Net [Abstract] Interest Income (Expense), Operating [Abstract] Derivatives Derivative Instruments, Gain (Loss) [Line Items] Hedging Designation [Domain] Hedging Designation [Domain] Less than or equal to 80% Debt-to-Value Ratio, Less than or Equal to 80 Percent [Member] Debt-to-Value Ratio, Less than or Equal to 80 Percent [Member] Held for sale Held for sale Total loans, net Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance Total liabilities and equity Liabilities and Equity Pension and Other Attributable to Parent Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Institutional Securities Underwriting Underwriting [Member] Underwriting is the process by which investment bankers raise investment capital from investors on behalf of corporations and governments that are issuing either equity or debt securities. Private equity and other Private Equity And Other Funds [Member] Private Equity And Other Funds Corporate and other debt Trading Liabilities, Fair Value Disclosure Credit Derivatives by Maturity [Axis] Credit Derivatives by Maturity [Axis] Credit Derivatives by Maturity [Axis] Schedule of Credit Derivatives [Table] Credit Derivative [Table] Schedule of Equity Method Investments [Table] Equity Method Investment [Table] Financial instruments collateral Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Equity - FX Correlation Measurement Input, Equity - Foreign Exchange Correlation [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] Amounts Offset Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, Asset Offset Investment securities Schedule Of Marketable Securities [Line Items] 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. Common stock held in treasury at cost Treasury Stock, Common [Member] Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Pay vs Performance Disclosure [Line Items] CDO Collateralized Debt Obligations [Member] Tier 1 leverage (as a percent) Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum U.S. agency securities US Government Agencies Debt Securities [Member] United States District Court for the Southern District of New York (“SDNY”) styled In Re: Interest Rate Swaps Antitrust Litigation United States District Court for the Southern District of New York (“SDNY”) styled In Re: Interest Rate Swaps Antitrust Litigation [Member] United States District Court for the Southern District of New York (“SDNY”) styled In Re: Interest Rate Swaps Antitrust Litigation Liquidation preference per share (USD per share) Preferred Stock, Liquidation Preference Per Share Liabilities Liabilities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Net (charge-offs)/ recoveries Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) Less than or equal to 679 FICO Score, Less than 680 [Member] FICO Score, Less than 680 [Member] Qualifying Special Purpose Entity, Classification [Axis] Qualifying Special Purpose Entity, Classification [Axis] Qualifying Special Purpose Entity by Classification Assets at Fair value Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Regulatory Requirements Regulatory Capital Requirements under Banking Regulations [Text Block] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Two Years Ago Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Original maturities of one year or less Short-term Debt, Maturities, Repayments of Principal in Next Twelve Months Amount of short-term debt payable maturing in the next fiscal year following the latest fiscal year. Savings and demand deposits Savings and Demand Deposits The aggregate of amount of money in accounts that may bear interest and that the depositor is entitled to withdraw at any time without prior notice; and amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs). Comprehensive income applicable to Morgan Stanley Comprehensive Income (Loss), Net of Tax, Attributable to Parent Measurement Input Type [Axis] Measurement Input Type [Axis] Name Measure Name AFS securities: Fair value, due within 1 year Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances Schedule of Rollforward of Level 3 Liabilities Measured at Fair Value on a Recurring Basis Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Deposits Increase (Decrease) in Deposits Proceeds from paydowns and maturities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Securities borrowed Securities Borrowed [Abstract] Credit Derivatives, Protection [Domain] Credit Derivatives, Protection [Domain] Class of Stock Class of Stock [Line Items] Inflation Volatility Measurement Input, Inflation Volatility [Member] Futures Contracts Future [Member] Increase (decrease) in operating assets Increase (Decrease) in Operating Assets Gross Amounts Securities loaned Securities Loaned, Gross Including Not Subject to Master Netting Arrangement Netting Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Total greater than one year Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] 1 - 3 (Years) More than One and within Three Years from Balance Sheet Date [Member] More than One and within Three Years from Balance Sheet Date [Member] Noncontrolling interests Nonredeemable Noncontrolling Interest Total assets VIE Assets Debt and Equity Interests Assets Assets Advanced (as a percent) Banking Regulation, Capital Conservation Buffer, Capital Conserved, Minimum, Advanced Banking Regulation, Capital Conservation Buffer, Capital Conserved, Minimum, Advanced Carrying Value Portion at Other than Fair Value Measurement [Member] Schedule of Fair Value Hedges - Hedged Items Schedule of Hedged Liability, Fair Value Hedge [Table Text Block] Tabular disclosure of carrying amount of hedged liabilities recognized in the statement of financial position, including the cumulative amount of fair value hedging adjustments to hedged liabilities included in the carrying amount of the hedged liabilities. Geographical [Domain] Geographical [Domain] Credit Derivatives Contract Type [Axis] Credit Derivatives Contract Type [Axis] Loss Given Default Measurement Input, Loss Given Default [Member] Measurement input using amount expressed as a percentage of par that is expected to be received when a credit event occurs. Variable Interest Entities and Securitization Activities Variable Interest Entity Disclosures [Text Block] Describes how the entity aggregates Variable Interest Entities (VIE) for disclosure purposes, distinguishing between (a) VIEs that are not consolidated because the enterprise is not the primary beneficiary but has a variable interest and (b) VIEs that are consolidated. Investment vehicles Investment Vehicles [Member] Investment Vehicles Cash flows from operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Lending commitments participated to third parties Commitments participated to third parties Commitments participated to third parties. HTM securities: Amortized cost, after 10 years Debt Securities, Held-To-Maturity, Maturity, Allocated And Single Maturity Date, Rolling After 10 Years, Amortized Cost Less Allowance For Credit Loss Debt Securities, Held-To-Maturity, Maturity, Allocated And Single Maturity Date, Rolling After 10 Years, Amortized Cost Less Allowance For Credit Loss Borrowings Interest Expense, Borrowings Assets at fair value Assets, Fair Value Disclosure [Abstract] Variable Interest Entity Variable Interest Entity [Line Items] 2028 Time Deposit Maturities, Year Two Over 10 years Nonredeemable Funds, Maturity, after Ten Years, at Carrying Value Carrying value of nonredeemable funds maturing after tenth fiscal year following latest fiscal year. Standardized (as a percent) Total capital (as a percent) Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum Credit Score, FICO [Axis] Credit Score, FICO [Axis] Held-to-maturity, fair value Fair Value HTM securities: Fair value, total Debt Securities, Held-to-Maturity, Fair Value Dividends declared per common share (USD per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] HTM securities: Fair value, after 5 years through 10 years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Level 2 Fair Value, Inputs, Level 2 [Member] Investment securities—AFS Debt Securities, Available-For-Sale [Member] Debt Securities, Available-For-Sale Investments Equity Method Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] FFELP student loan ABS: Asset-backed Securities, Federal Family Education Loan Program [Member] Asset-backed securities that are repaid with cash flows derived from student loans that are guaranteed under the Federal Family Education Loan Program (FFELP). Net capital Broker-Dealer, Net Capital Related Party Related Party [Member] Total Nonredeemable Funds, Maturity, at Carrying Value Carrying value of nonredeemable funds. RML Residential Mortgage [Member] Fair Value Asset (Liability) Credit Risk Derivatives, at Fair Value, Net Median Median [Member] Document Information [Table] Document Information [Table] PEO PEO [Member] Banking Regulation, Tier 1 Leverage Capital, Actual Banking Regulation, Tier 1 Leverage Capital, Actual Trading assets Debt securities, trading assets Debt Securities, Trading Schedule of Investment Securities by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Borrowings Debt [Member] Derivative, Credit Risk Related Contingent Features, Triggering Event [Domain] Derivative, Credit Risk Related Contingent Features, Triggering Event [Domain] Circumstances in which credit-risk-related contingent features could be triggered in derivative instruments that are in a net liability position at the end of the reporting period. Repurchases of common stock and employee tax withholdings Payments Related to Common Stock Repurchase and Tax Withholding for Share-based Compensation Amount of cash outflow to reacquire common stock and satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. Securities sold under agreements to repurchase Securities Sold under Agreements to Repurchase [Abstract] Changes in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Single Modifications Single Modifications [Member] Single Modifications CET1 capital Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Actual CET1 capital ratio Banking Regulation, Common Equity Tier 1 Risk-Based Capital [Abstract] Equity Price Measurement Input, Share Price [Member] Time deposits Total Time Deposits Gross Amounts Securities Purchased under Agreements to Resell, Gross Including Not Subject to Master Netting Arrangement Retained earnings Retained Earnings [Member] Cash and cash equivalents, at beginning of period Cash and cash equivalents, at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Derivative and other contracts Derivative assets Total in Trading assets Derivative Asset AFS: Fair value, 12 months or longer Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Economic hedges of loans Not Designated as Hedging Instrument, Economic Hedge [Member] Interest Expense Interest Expense [Member] Net Amounts Security Borrowed, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Nonrecurring Fair Value, Nonrecurring [Member] Schedule of Time Deposit Maturities Time Deposit Maturities [Table Text Block] Employee loans Due From Employees, Gross Due From Employees, Gross Investments Investment securities: fair value, total Investment securities Investments, Fair Value Disclosure Intangible assets (net of accumulated amortization of $1,968 and $1,882) Intangible Assets, Net (Excluding Goodwill) Commitments, guarantees and other Commitments, Guarantees and Other Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) Provision (release) Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) Product and Service [Domain] Product and Service [Domain] AFS securities Debt Securities, Available-for-Sale [Abstract] Funding spread Securities Sold Under Agreement To Repurchase, Measurement Input Securities Sold Under Agreement To Repurchase, Measurement Input Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Corporate equities, measurement input value Equity Securities, FV-NI, Measurement Input Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Total liabilities at fair value Total Liabilities, Fair Value Disclosure Securities borrowed Increase (Decrease) in Securities Borrowed Maximum potential payout/notional Notional Derivative, Notional Amount Schedule of Preferred Stock Outstanding and Preferred Stock Dividends Preferred Stock Disclosure [Table Text Block] Tabular disclosure of the entire disclosure for terms, amounts, nature of changes, rights and privileges, dividends, and other matters related to preferred stock. Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Revolving Financing Receivable, Excluding Accrued Interest, Revolving City Area Code City Area Code Summary of Credit Losses and Schedule of Allowance for Credit Losses Rollforward - Loans and Lending Commitments . Summary of Gross Charge-offs by Origination Year Financing Receivable, Allowance for Credit Loss [Table Text Block] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Loans, measurement input value Loan, Held-for-Sale, Measurement Input Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Standardized (as a percent) Banking Regulation, Countercyclical Capital Buffer Schedule of Receivables from Contracts with Customers Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Non-interest revenues Revenue from Contract with Customer, Performance Obligations Fully or Partially Satisfied in Prior Periods Revenue recognized in the reporting period from performance obligations satisfied (or partially satisfied) in previous periods. Loan Restructuring Modification Name [Domain] Loan Restructuring Modification Name [Domain] Cash flows from investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Advanced (as a percent) Tier One Risk Based Common Capital Required for Capital Adequacy to Risk Weighted Assets, Advanced Tier One Risk Based Common Capital Required for Capital Adequacy to Risk Weighted Assets, Advanced Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Customer and other receivables Interest Receivable Fair Value Hedges Fair Value Hedging [Member] Cash Flow Hedges AOCI, Derivative Qualifying as Hedge, Excluded Component, Noncontrolling Interest [Member] Less Than 1 (Year) Less than Twelve Months from Balance Sheet Date [Member] Goodwill Goodwill Equity Net derivatives: Equity Equity Contract [Member] G-SIB capital surcharge Banking Regulation, Global Systemically Important Bank (GSIB) Surcharge [Abstract] Collateral that was sold or repledged Customer Securities for which Entity has Right to Sell or Repledge, Fair Value of Securities Sold or Repledged Trading assets, net of Trading liabilities Increase (Decrease) in Financial Instruments Used in Operating Activities Supplemental Disclosure of Cash Flow Information Supplemental Cash Flow Information [Abstract] Revenue from External Customer [Line Items] Revenue from External Customer [Line Items] Other Performance Measure, Amount Other Performance Measure, Amount U.S. Treasury and agency securities US Treasury and Government [Member] Securitization representations and warranties Securitizations Representations and Guarantees [Member] Securitizations Representations and Guarantees CDS protection sold with identical protection purchased Credit Derivative, Purchased Credit Protection, Notional Amount Notional amount of purchased credit protection expected to cover future payments under the credit risk derivative. Contingency Probability Measurement Input, Contingency Probability [Member] Measurement input using probability associated with the realization of an underlying event upon which the value of an asset is contingent. Related Party, Type [Domain] Related and Nonrelated Parties [Domain] Nonaccrual HFI loans to total HFI loans Financing Receivable, Nonaccrual to Outstanding, Percent Commercial and Residential real estate Real Estate [Member] Fair value of other secured financings Other secured financings Other Secured Financings, Fair Value Disclosure Fair value portion of secured financings other than securities sold under agreements to repurchase and securities loaned. Schedule of Loans by Interest Rate Type Schedule of Accounts, Notes, Loans and Financing Receivable, Interest Rate Type [Table Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable, Interest Rate Type Litigation Status [Axis] Litigation Status [Axis] Derivative Instrument [Axis] Derivative Instrument [Axis] MTOB MTOB Municipal Tender Option Bonds [Member] Municipal Tender Option Bonds Other assets Cash Reserve Deposit Required and Made Financial liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Loans Lending commitment [Member] It represents the notitonal amount of legally binding obligations to provide funding to clients for different types of loan transactions. Commercial real estate Commercial Real Estate Portfolio Segment [Member] Net cumulative unrealized performance-based fees at risk of reversing Accrued Performance Fees Amount of accrued revenue earned by the entity based on the investment results achieved, net of any reversals. Investment securities: amortized cost, total Investment securities: amortized cost, total Investment Securities Amortized Cost This item represents the investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method, which are net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. Entity [Domain] Entity [Domain] Net cash provided by (used for) investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Other assets—Other investments Other Investments, Fair Value Disclosure Fair value portion of investments classified as other. Other assets - Premises, equipement and software Property, Plant, and Equipment, and Capitalized Software Costs [Member] Cash payments for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Schedule of Proceeds from New Securitization Transactions and Sales of Loans Schedule Of Proceeds From Securitization Transactions [Table Text Block] Tabular disclosure of the proceeds received from securitization activities. Basis of Financial Information Basis of Accounting, Policy [Policy Text Block] Number of investments Financing Receivable, Excluding Accrued Interest, Number of Defaulted and Modified Investments Financing Receivable, Excluding Accrued Interest, Number of Defaulted and Modified Investments Retained interests Retained Interest The carrying value of an interest continued to be held by the transferor in a securitized financial instrument. Securities-based lending Securities-Based Lending [Member] Securities-Based Lending [Member] Exchange- Traded Exchange Traded [Member] Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract] Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract] FX Correlation Measurement Input, Foreign Exchange Correlation [Member] Equity [Abstract] Equity [Abstract] Over 5 (Years) More than Five Years from Balance Sheet Date [Member] Net transfers Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net Senior Senior Notes Other Comprehensive Income Location [Domain] Other Comprehensive Income Location [Domain] City of Philadelphia, et al. v. Bank of America Corporation, et al. City of Philadelphia, et al. v. Bank of America Corporation, et al. [Member] City of Philadelphia, et al. v. Bank of America Corporation, et al. Hedge Accounting Derivatives, Policy [Policy Text Block] Segment, Geographic and Revenue Information Segment Reporting Disclosure [Text Block] Common stock issued to employee stock trusts Common Stock Issued to Employee Trust [Member] Common Stock Issued to Employee Trust. U.S. Treasury securities US Treasury Securities [Member] Not designated as accounting hedges Not Designated as Hedging Instrument [Member] Fair Value Measurements Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Commitments Other Commitments [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Weighted Average Weighted Average [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] HTM securities: Annualized average yield, after 5 years through 10 years (as a percent) Held-to-maturity Securities Debt Maturities, Year Six Through Ten, Annualized Average Yield Annualized average yield of Held-to-maturity securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Comparable Pricing Valuation Technique, Comparable Pricing [Member] Valuation approach when prices for the identical instrument are not available. Repurchases of common stock under the Firm’s Share Repurchase Authorization Stock Repurchased During Period, Value Loan Price Measurement Input, Loan Price [Member] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Collateralized Transactions Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] No longer employed by the Firm No Longer Employed by the Firm [Member] No Longer Employed by the Firm [Member] Derivative, Credit Risk Related Contingent Features, Triggering Event [Axis] Derivative, Credit Risk Related Contingent Features, Triggering Event [Axis] Circumstances in which credit-risk-related contingent features could be triggered in derivative instruments that are in a net liability position at the end of the reporting period. Regulatory Minimum (as a percent) Banking Regulation, Total Risk-Based Capital Ratio, Regulatory Minimum Banking Regulation, Total Risk-Based Capital Ratio, Regulatory Minimum Residential mortgages Residential Mortgage-Backed Securities [Member] Number of swap execution facilities Number Of Swap Execution Facilities Number Of Swap Execution Facilities Option Model Valuation Technique, Option Pricing Model [Member] Arrangement Duration Trading Arrangement Duration Other credit contracts Other Credit Derivatives [Member] Segments [Axis] Segments [Axis] Risk-based capital ratio Banking Regulation, Risk-Based Information [Abstract] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Other investing activities Payment for (Proceeds from) Other Investing Activity Liabilities Liability [Member] Non-Cumulative Preferred Stock, Series F, $0.01 par value Series F Series F Preferred Stock [Member] Summary of Tax Equity Investments under the Proportional Amortization Method Investment Program, Tax Equity Investments Under Proportional Amortization Method [Table Text Block] Investment Program, Tax Equity Investments Under Proportional Amortization Method Credit Derivatives Contract Type [Domain] Credit Derivatives Contract Type [Domain] Less than 30 Days Maturity Less than 30 Days [Member] AFS securities Available-for-Sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] Number of antitrust class action complaints Number Of Antitrust Class Action Complaints Number Of Antitrust Class Action Complaints Assets Assets [Abstract] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Other Commitments [Axis] Other Commitments [Axis] IR Curve Correlation Measurement Input, Interest Rate Curve Correlation [Member] Measurement Input, Interest Rate Curve Correlation [Member] Fair Values Fair Value Disclosures [Text Block] Schedule of Modified Loans and Troubled Debt Restructurings Financing Receivable, Modified [Table Text Block] Investment, Name [Axis] Investment, Name [Axis] Nonaccrual loans Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status Transfer of Financial Assets Accounted for as Sales Transfer of Financial Assets Accounted for as Sales [Line Items] CTA Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest [Member] Credit Spread Measurement Input, Credit Spread [Member] IR Volatility Skew Measurement Input, Interest Rate Volatility Skew [Member] MSBNA Morgan Stanley Bank, National Association [Member] Morgan Stanley Bank, National Association Americas Americas [Member] Amounts for which master netting or collateral agreements are not in place or may not be legally enforceable, included in Net amounts Derivative Liability, Not Subject to Master Netting Arrangement Derivative assets recognized in the balance sheet Derivative Asset, Subject to Master Netting Arrangement, before Offset Entity Registrant Name Entity Registrant Name Bilateral Downgrade Agreement Collaborative Arrangement [Member] Cash flow hedges expected to be reclassified from AOCI Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Gross Secured Financing Balances Securities Financing Transaction [Line Items] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Total capital (as a percent) Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum Gains (losses) due to changes in instrument-specific credit risk Fair Value, Option, Credit Risk, Gains (Losses) on Assets Investments, measurement input value Alternative Investment, Measurement Input Non-Cumulative Preferred Stock, Series L, $0.01 par value Series L Series L Preferred Stock [Member] Series L Preferred Stock [Member] Commodity and other Net derivatives: Commodity and other Commodities Commodity and Other Contracts [Member] Derivative instrument whose primary underlying risk is tied to commodity contracts and other contracts that are not reported as interest rate, foreign exchange, equity security and index or credit contracts. Total assets at fair value Total Assets, Fair Value Disclosure Deposits [Abstract] Deposits [Abstract] Total Financial Asset, Past Due [Member] OSF Structured Finance [Member] 3 - 5 (Years) More than Three and within Five Years from Balance Sheet Date [Member] More than Three and within Five Years from Balance Sheet Date [Member] Schedule of Borrowings Schedule of Debt [Table Text Block] Related Party, Type [Axis] Related and Nonrelated Parties [Axis] Purchases and originations Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases and Originations Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases and Originations Schedule of Financial Instruments Not Measured at Fair Value Schedule of Financial Instruments Not Measured at Fair Value [Table Text Block] Tabular disclosure of carrying value, estimated fair value and hierarchy classification of certain financial instruments that are not carried at fair value on a recurring basis. Nonaccrual loans 90 or more days past due Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Restatement Determination Date: Restatement Determination Date [Axis] Employment Status [Axis] Employment Status [Axis] Employment Status [Axis] Other assets—ROU assets Right-of-Use Assets, Fair Value Disclosure Right-of-Use Assets, Fair Value Disclosure Share-based award activity Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] 30-90 Days Maturity 30 to 90 Days [Member] Other financing activities Proceeds from (Payment for) Other Financing Activity Schedule of Share Repurchases Schedule of Repurchase of Common Stock [Table Text Block] Tabular disclosure of repurchase of common stock. Cash-Synthetic Basis Measurement Input, Cash-Synthetic Basis [Member] Measurement input using the price differential between cash financial instruments and their synthetic derivative-based equivalents. Reclass. After-tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Name Trading Arrangement, Individual Name Underlying Asset Class [Domain] Underlying Asset Class [Domain] Schedule of Offsetting of Certain Collateralized Transactions Offsetting Assets and Liabilities [Table Text Block] Tabular disclosure of derivative and other financial assets and liabilities that are subject to offsetting, including master netting arrangements. Net change in cash flow hedges included within AOCI Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Securities loaned Increase (Decrease) in Securities Loaned Transactions Prior Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff Loans Loan, Held-for-Sale, Fair Value Disclosure Deposits Deposits [Member] Other Other Variable Interests [Member] CCyB Banking Regulation, Countercyclical Capital Buffer [Abstract] Banking Regulation, Countercyclical Capital Buffer Derivatives, Notional Amount Notional Disclosures [Abstract] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Trading Revenues Trading Revenue [Member] Preferred stock Preferred Stock [Member] Name Awards Close in Time to MNPI Disclosures, Individual Name Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Total Other Commitment Pension and Other Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest [Member] Net Amounts Security Sold under Agreement to Repurchase, Including Not Subject to Master Netting Arrangement, after Offset and Deduction HTM securities: Annualized average yield, after 1 years through 5 years (as a percent) Held-to-maturity Securities Debt Maturities Year Two Through Five Annualized Average Yield Annualized average yield of Held-to-maturity securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Other comprehensive income (loss) applicable to noncontrolling interests Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Investments Alternative Investment Schedule of Joint Ventures Joint Ventures [Table Text Block] Joint Ventures [Table Text Block] Common stock held in treasury at cost, $0.01 par value (459,264,681 and 456,059,842 shares) Treasury Stock, Value Gross unrealized losses, unallocated basis adjustment Unallocated basis adjustment Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Accumulated Gross Unrealized Loss, Before Tax, Cumulative Increase (Decrease) Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Accumulated Gross Unrealized Loss, Before Tax, Cumulative Increase (Decrease) Bond Volatility Bond Volatility Measurement Input [Member] Bond Volatility Measurement Input Tax effect Other Comprehensive Income (Loss) before Reclassifications, Tax Litigation Case [Axis] Litigation Case [Axis] Liability Class [Axis] Liability Class [Axis] Segments [Domain] Segments [Domain] Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Amounts Offset Security Loaned, Subject to Master Netting Arrangement, Asset Offset Derivative Assets Derivative Asset [Abstract] Interest expense Interest Expense, Operating and Nonoperating [Abstract] Change in Net Unrealized Gains (Losses) on AFS Securities Attributable to Parent AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Excess net capital Net Capital Excess (Shortage) under Securities and Exchange Commission Regulation and Commodity Exchange Act The amount by which actual net capital exceeds (does not exceed) the greater required net capital under Securities and Exchange Commission and CFTC regulations. Adjusted average assets Adjusted Average Assets Adjusted average assets represent the denominator of the Tier 1 leverage ratio and are composed of the average daily balance of consolidated on-balance-sheet assets, adjusted for disallowed goodwill, intangible assets, certain deferred tax assets, certain investments in the capital instruments of unconsolidated financial institutions and other adjustments. Counterparty netting Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Fair Value Option Fair Value, Option [Text Block] Purchases Payments to Acquire Debt Securities, Available-for-Sale Foreign Exchange Volatility Skew Measurement Input, Foreign Exchange Volatility Skew [Member] Measurement Input, Foreign Exchange Volatility Skew [Member] Securities purchased under agreements to resell Securities Purchased under Agreements to Resell [Abstract] State and municipal securities US States and Political Subdivisions Debt Securities [Member] Customer and other payables Interest Payable Additional VIE assets owned Variable Interest Entity, Assets Issued by Securitization Special Purpose Entity Carrying value of total exposure to non-consolidated variable interest entities that does not meet the criteria for detailed breakout, primarily interests issued by securitization special purpose entities for which the maximum exposure to loss is less than specific thresholds. Subordinated Subordinated Debt One Year Ago Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Fair Value Adjustment Disclosure Fair Value, Adjustment Disclosure [Abstract] Financial Asset, Aging [Axis] Financial Asset, Aging [Axis] All Executive Categories All Executive Categories [Member] Common stock Common Stock, Value, Issued Renewable energy and other Renewable Energy and Other [Member] Renewable Energy and Other Loans Interest and Fee Income, Loans and Leases IR Curve Measurement Input, Interest Rate Curve [Member] Measurement input using the term structure of interest rates (relationship between interest rates and the time to maturity) and a market's measure of future interest rates at the time of observation. An interest rate curve is used to set interest rate and foreign exchange derivative cash flows and is a pricing input used in the discounting of any OTC derivative cash flow. Commitments and contingent liabilities (see Note 13) Commitments and Contingencies Securities purchased under agreements to resell Increase (Decrease) in Securities Purchased under Agreements to Resell The net change in the beginning and end of period for investments purchased under the agreement to resell such investment balances. Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Cleared OTC Exchange Cleared [Member] Noncontrolling interests Noncontrolling Interest [Member] Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration] Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration] Carrying Value Fair Value, Investments, Entities that Calculate Net Asset Value, at Carrying Value Carrying value of investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. AFS securities: Marketable Securities [Abstract] Variable Interest Entity, by Interest [Axis] Variable Interest Entity, by Interest [Axis] Interest Income Interest Income [Member] Revolving Financing Receivable, Revolving, Writeoff Basis adjustments included in carrying amount—Outstanding hedges Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Weighted average stated maturity, in years Long-Term Debt, Term AFS securities: Fair value, after 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Derivative and other contracts Derivative Financial Instruments, Assets [Member] Carrying amount currently or previously hedged Hedged Liability, Fair Value Hedge Institutional Securities Segment Institutional Securities1 Institutional Securities Segment [Member] Institutional Securities Segment [Member] Hedging Designation [Axis] Hedging Designation [Axis] Fair value of borrowings Borrowings Borrowings at fair value Debt Instrument, Fair Value Disclosure Pension and other Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Net amounts Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Less: Realized gains (losses) (pre-tax) reclassified from AOCI to interest income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Net Investment Hedges Net Investment Hedging [Member] Derivative Contract [Domain] Derivative Contract [Domain] Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Other secured financings, measurement input value Other Secured Financings, Measurement Input Value of input used to measure other secured financings. Gross realized (losses) Debt Securities, Available-for-Sale, Realized Loss Net transfers Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net All Individuals All Individuals [Member] VIE assets (UPB) UPB Variable Interest Entity, Reporting Entity Involvement, Unpaid Principal Balance, Amount The unpaid principal balance of Variable Interest Entity (VIE) assets, where the reporting entity is not the VIE’s primary beneficiary. Original maturities: Debt Securities, Held-to-Maturity, Parenthetical Disclosure [Abstract] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Customer and other receivables and other assets Increase (Decrease) in Receivables Name Forgone Recovery, Individual Name Protection Purchased Credit Default Swap, Buying Protection [Member] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Loans and other receivables Loans and Other Receivables [Member] Loans and Other Receivables MABS Mortgage and Asset-Backed Securities [Member] Mortgage and Asset-Backed Securities Schedule of Net Revenues by Region Net Revenue from External Customers by Geographic Areas [Table Text Block] Low-income housing Low Income Housing [Member] Low Income Housing OCI activity: OCI, Equity Method Investment, after Tax [Abstract] Debt Securities, Held-to-maturity [Table] Debt Securities, Held-to-Maturity [Table] AFS Securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Noncontrolling Interest [Member] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Index and basket Index and Basket Credit Default Swap [Member] One year or less Secured Financings, Original Maturities One Year or Less Secured financings with original maturities one year or less. Geographical [Axis] Geographical [Axis] Collateral received with right to sell or repledge Customer Securities for which Entity has Right to Sell or Repledge, Fair Value Corporate Commercial Portfolio Segment [Member] Derivative Liabilities Derivative Liability [Abstract] Transaction Type [Axis] Transaction Type [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Retained interests Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other Other liabilities and accrued expenses—Lending commitments Other Liabilities and accrued expenses, Fair Value Disclosure Fair value portion of other liabilities and accrued expenses Repurchases of common stock and employee tax withholdings Treasury Stock, Value, Acquired, Cost Method and Employee Tax Withholdings Equity impact of the cost of common and preferred stock that were repurchased during the period recorded using the cost method, and employee tax withholdings. Nonaccrual loans Fair Value, Option, Loans Held as Assets, Aggregate Difference Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Investment securities Interest Income, Operating Title of 12(b) Security Title of 12(b) Security Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Provision (release) Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Non-investment grade Internal Noninvestment Grade [Member] Provision for credit losses Provision for credit losses Financing Receivable And Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) Financing Receivable And Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) Allowance for credit loss Long-Term Line Of Credit, Allowance For Credit Loss Long-Term Line Of Credit, Allowance For Credit Loss Original maturities greater than one year: Long-Term Debt, Fiscal Year Maturity [Abstract] Earnings per common share Earnings Per Share [Abstract] Securities sold under agreements to repurchase Interest Expense, Securities Sold under Agreements to Repurchase Schedule of Details of Interest Income and Interest Expense Interest Income and Interest Expense Disclosure [Table Text Block] CLN and Other Credit-Linked Notes and Other [Member] Credit-Linked Notes and Other [Member] Gains (losses) recognized in interest expense Gain (Loss) on Fair Value Hedges Recognized in Earnings Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Total loans, net Financing Receivable including Held-for-Sale, after Allowance for Credit Loss Financing Receivable including Held-for-Sale, after Allowance for Credit Loss Greater than one year Secured Financings, Original Maturities Greater than One Year Secured financings with original maturities greater than one year. AFS securities: Annualized average yield, after 1 year through 5 years (as a percent) Available-for-sale Securities, Debt Maturities, Year Two Through Five, Annualized Average Yield Annualized average yield of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Financing Receivable and Allowance for Credit Losses Financing Receivable, Allowance for Credit Loss [Line Items] Other Other Loans [Member] Other Loans [Member] Award Timing Disclosures [Line Items] Funding Spread Measurement Input, Funding Spread [Member] Measurement input using the cost of borrowing defined as the incremental spread over the OIS rate for a specific collateral rate (which refers to the rate applicable to a specific type of security pledged as collateral). Other Collateralized Securities, Other [Member] Fair value of securities sold under agreement to repurchase Securities sold under agreements to repurchase Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure Thereafter Time Deposit Maturities, after Year Four Time Deposit Maturities, after Year Four Fixed Rate Financing Receivable including Held-for-Sale with Fixed Rates of Interest Financing Receivable including Held-for-Sale with Fixed Rates of Interest Measurement Frequency [Domain] Measurement Frequency [Domain] Commitment Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments After-tax Gain (Loss) Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Other Off-Balance-Sheet, Credit Loss, Allowance For Credit Exposures, Other Increase (Decrease) Other increase (decrease) in the allowance for credit exposures on off-balance-sheet loan commitments. Total Equity Equity [Text Block] Non-Cumulative Preferred Stock, Series O, $0.01 par value Series O Series O Preferred Stock [Member] Series O Preferred Stock Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Held for investment (net of allowance for credit losses of $1,174 and $1,132) Held for investment Total loans, net Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Net income applicable to Morgan Stanley Net income applicable to Morgan Stanley Net Income (Loss) Attributable to Parent Proceeds from (payments for): Proceeds From (Payments For) [Abstract] Proceeds from (Payments for) [Abstract] Total capital (as a percent) Banking Regulation, Total Risk-Based Capital Ratio, Actual Pending Litigation Pending Litigation [Member] CDS Credit Default Swap [Member] Commodity Volatility Measurement Input, Commodity Volatility [Member] Schedule of Securities Segregated for Regulatory Purposes Schedule of Cash and Securities Segregated under Federal and Other Regulations [Table Text Block] Tabular disclosure of cash subject to withdrawal restrictions, restricted deposits held as compensating balances, and cash and securities segregated in compliance with regulations (such as cash deposited in a special reserve account for the exclusive benefit of customers). Equity Volatility Measurement Input, Equity Volatility [Member] Measurement Input, Equity Volatility Segment Reporting Information Segment Reporting Information [Line Items] Preferred stock shares authorized (shares) Preferred Stock, Shares Authorized Adoption Date Trading Arrangement Adoption Date Customer and other receivables Contract with Customer, Asset, after Allowance for Credit Loss Single-name CDS Single name Single Name Credit Default Swap [Member] Beginning balance Ending balance Off-Balance-Sheet, Allowance for Credit Exposures A valuation allowance for credit exposures related to off-balance-sheet loan commitments. Qualifying Special Purpose Entities, Classification [Domain] Qualifying Special Purpose Entities, Classification [Domain] Qualifying Special Purpose Entity, Classification Customer payables and Other Interest Expense, Customer Payables and Other The interest expense recognized during the period on customer payables and fees received from prime brokerage customers for stock loan transactions incurred to cover customers' short positions. Deferred Compensation Compensation Related Costs, Policy [Policy Text Block] AFS Securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Including Noncontrolling Interest [Member] Retained earnings Retained Earnings (Accumulated Deficit) Residential real estate Residential Portfolio Segment [Member] Schedule of Details of Loans and Lending Commitments at Fair Value Fair Value, Loans and Loan Commitments [Table Text Block] Tabular disclosure of loans and loan commitments held at fair value. Forward-Starting Secured Financing Receivables Forward-Starting Secured Financing Receivables [Member] Forward-Starting Secured Financing Receivables Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Schedule of Gains (Losses) on Economic Loan Hedges Schedule of Economic Loan Hedges [Table Text Block] Schedule of Economic Loan Hedges Average Arithmetic Average [Member] Investment securities: Annualized average yield, total (as a percent) Investment Securities Debt Maturities Annualized Average Yield Purchases Payments to Acquire Held-to-Maturity Securities Class of Stock [Axis] Class of Stock [Axis] Commissions and fees Brokerage Commissions Revenue Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Required Ratio Minimum Regulatory Capital Ratio [Abstract] Credit Derivatives Credit Derivatives [Line Items] Interests purchased in the secondary market Interests Purchased in Secondary Market, Fair Value Fair value of interests purchased in the secondary market Statement [Table] Statement [Table] Change in Net DVA Attributable to Parent AOCI, Debt Valuation Adjustment, Parent [Member] AOCI, Debt Valuation Adjustment, Parent [Member] Adjustments to reconcile net income to net cash provided by (used for) operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Transaction taxes Transaction Taxes Transaction Taxes Recognized in OCI Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss) Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss) Series C Series C Preferred Stock [Member] Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Introduction and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Supplementary leverage exposure Supplemental Leverage Exposure The denominator of supplementary leverage ratio. It's a banking organization's total leverage exposure, which includes many off-balance-sheet exposures. Schedule of Rollforward of Level 3 Assets Measured at Fair Value on a Recurring Basis Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] All Adjustments to Compensation All Adjustments to Compensation [Member] Interest Rate Reduction Contractual Interest Rate Reduction [Member] Amendment Flag Amendment Flag Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales Termination Date Trading Arrangement Termination Date Interest bearing deposits with banks Interest-Bearing Deposits in Banks and Other Financial Institutions Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] 2029 Time Deposit Maturities, Year Three ACL ACL Beginning balance Ending balance Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Risk-based capital Regulatory Capital Requirements, Amount [Abstract] Total Financing Receivable, Allowance for Credit Loss, Writeoff Financing Receivable, Allowance for Credit Loss, Writeoff Basic (shares) Weighted average common shares outstanding, basic (shares) Weighted Average Number of Shares Outstanding, Basic Schedule of Common Shares Outstanding for Basic and Diluted EPS Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Total gross derivatives Derivative Asset, Gross Asset Including Not Subject to Master Netting Arrangement Borrowings Borrowings [Member] Segment Reporting [Abstract] Segment Reporting [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] IKB International S.A. in Liquidation, et al. v. Morgan Stanley, et al. IKB International S.A. in Liquidation, et al. v. Morgan Stanley, et al. [Member] IKB International S.A. in Liquidation, et al. v. Morgan Stanley, et al. Tax effect Reclassification from AOCI, Current Period, Tax Commitment, Fiscal Year Maturity Other Commitment, Fiscal Year Maturity [Abstract] Total Debt Securities, Available-for-Sale, Realized Gain (Loss) Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Consolidated Entities [Axis] Consolidated Entities [Axis] Common stock, par value (USD per share) Common Stock, Par or Stated Value Per Share MSPBNA Morgan Stanley Private Bank, National Association [Member] Morgan Stanley Private Bank, National Association Cash and Cash Equivalents Cash and Cash Equivalents Disclosure [Text Block] Geographic Distribution [Axis] Geographic Distribution [Axis] Equity Correlation Measurement Input, Equity Correlation [Member] Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Total capital Banking Regulation, Total Capital, Actual Financial Instruments Owned and Pledged as Collateral [Table] Financial Instruments Owned and Pledged as Collateral [Table] Cash dividends Payments of Dividends Deposits not subject to FDIC insurance Deposits not subject to FDIC insurance Deposits not subject to FDIC insurance Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Occupancy and equipment Occupancy, Net Net Amounts Security Loaned, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Schedule of Mortgage- and Asset-Backed Securitization Assets Schedule Of Mortgage-Backed And Asset-Backed Securitization Assets [Table Text Block] Schedule of Mortgage-Backed and Asset-Backed Securitization Assets [Table Text Block] Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Counterparty netting Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Insider Trading Arrangements [Line Items] Prior Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Current and less than 30 days past due Financial Asset, Not Past Due [Member] Total liabilities VIE Liabilities Liabilities Interest Rate Reduction (%) Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage Non-Cumulative Preferred Stock, Series K, $0.01 par value Series K Series K Preferred Stock [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Securities borrowed Balance Sheet Net Amounts Securities Borrowed Firm Investment banking revenues from contracts with customers (as a percent) Proportion of Investment Banking Revenue Recognized under New Accounting Pronouncement Proportion of investment banking revenue determined under new accounting pronouncement. Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Schedule of Commitments Commitments [Table Text Block] Commitments [Table Text Block] Schedule of Incremental Collateral and Termination Payments upon Potential Future Ratings Downgrade Schedule of Incremental Collateral and Termination Payments upon Potential Future Ratings Downgrade [Table Text Block] Schedule of Incremental Collateral and Termination Payments upon Potential Future Ratings Downgrade Cash collateral netting Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset Assets sold Transfer of Financial Assets Accounted for as Sales, Fair Value of Derecognized Assets Consolidation Items [Axis] Consolidation Items [Axis] Proceeds from paydowns and maturities Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Held-to-maturity (fair value of $42,993 and $45,615) Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Employee stock trusts Trust for Benefit of Employees [Member] Collateral posted Collateral Already Posted, Aggregate Fair Value Asset Pledged as Collateral [Member]