Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Unearned Robinhood Gold Subscription Revenue Unearned Robinhood Gold Subscription Revenue [Member] Unearned Robinhood Gold Subscription Revenue Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Credit card, net Credit Card, Net [Member] Credit Card, Net Restricted cash in other current assets, end of the period Restricted Cash, Current Award Timing Predetermined Award Timing Predetermined [Flag] Intangible assets, gross carrying value Intangible Assets, Gross (Excluding Goodwill) Indefinite-Lived Intangible Assets [Axis] Indefinite-Lived Intangible Assets [Axis] Entity File Number Entity File Number Additional paid-in capital Additional Paid-in Capital [Member] Equities Equities [Member] Equities Fair value of securities borrowed from users and third parties Fair value of securities borrowed from users and third parties Security Borrowed, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Tabular List, Table Tabular List [Table Text Block] Leases [Abstract] Securities loaned Amounts of liabilities presented on the consolidated balance sheets Securities Loaned Basic EPS: Earnings Per Share, Basic [Abstract] Number of unvested shares issued (in shares) Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Pledged Status [Axis] Pledged Status [Axis] Net interest revenues Interest Income, Interest-Earning Asset Number of types of allowance for credit losses related to credit cards Number of Types of Allowance For Credit Losses Number of Types of Allowance For Credit Losses Licenses License [Member] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Measurement Basis [Axis] Measurement Basis [Axis] Basic (in dollars per share) Basic EPS (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Line Of Credit, Condition [Domain] Line Of Credit, Condition [Domain] Line Of Credit, Condition [Domain] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Liabilities Liabilities, Fair Value Disclosure [Abstract] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] REVENUES Revenue from Contract with Customer [Text Block] Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Intangible Asset, Indefinite-Lived [Table] Intangible Asset, Indefinite-Lived [Table] Issuance of common stock upon settlement of restricted stock units, net of shares withheld (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Issuance of common stock in connection with Employee Share Purchase Plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Unrealized Gains Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Interest Rate Margin Two Interest Rate Margin, Two [Member] Interest Rate Margin, Two Adjustment to Compensation, Amount Adjustment to Compensation Amount Concentration risk, percentage Concentration Risk, Percentage Schedule of Financial Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] Other current and non-current assets Increase (Decrease) in Other Operating Assets Consolidation Consolidation, Policy [Policy Text Block] Share-based compensation Share-Based Payment Arrangement, Noncash Expense Indefinite-Lived Intangible Assets [Line Items] Indefinite-Lived Intangible Assets [Line Items] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] 640-690 FICO Score, 640 To 690 [Member] FICO Score, 640 To 690 Robinhood Credit Variable Interest Entity, Primary Beneficiary [Member] Cash Sweep Cash Sweep [Member] Cash Sweep Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Total stockholders’ equity Beginning balance Ending balance Equity, Attributable to Parent Measurement Frequency [Axis] Measurement Frequency [Axis] Citadel Securities, LLC Citadel Securities, LLC [Member] Citadel Securities, LLC Other comprehensive income, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Share-based compensation Share-Based Payment Arrangement, Expense Common stock, shares authorized (in shares) Common Stock, Shares Authorized Accrued interest receivable Financing Receivable, Accrued Interest, after Allowance for Credit Loss Goodwill and Intangible Assets Disclosure [Abstract] Contract Liabilities Contract with Customer, Liability [Roll Forward] Contract with Customer, Liability Current assets: Assets, Current [Abstract] Total liabilities and stockholders’ equity Liabilities and Equity Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Fair Value, Recurring Fair Value, Recurring [Member] Issuance of common stock in connection with a business combination (in shares) Stock Issued During Period, Shares, Acquisitions Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentrations of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Cover [Abstract] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] 1 to 2 Years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated And Single Maturity Date, After Year One And Two Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated And Single Maturity Date, After Year One And Two General and administrative General and Administrative Expense [Member] Useful Life Weighted Average Remaining Useful Life - Years Finite-Lived Intangible Asset, Useful Life Accounting Policies [Abstract] TradePMR Restricted Stock Units (RSUs) TradePMR Restricted Stock Units (RSUs) [Member] TradePMR Restricted Stock Units (RSUs) Net Carrying Value Finite-Lived Intangible Assets, Net Concentration Risk Type [Domain] Concentration Risk Type [Domain] Repayments on borrowings by the Credit Card Funding Trust Repayments of Secured Debt Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Activity Related to Time-Based and Market-Based RSUs Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Payments to Coastal Bank Off-Balance-Sheet, Credit Loss, Liability, Payments Off-Balance-Sheet, Credit Loss, Liability, Payments Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Contract with Customer Liability [Axis] Contract with Customer Liability [Axis] Contract with Customer Liability Total lease liabilities Operating Lease, Liability U.S. government agency securities US Government Agencies Debt Securities [Member] Foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount ≥ 90 days Financial Asset, Equal to or Greater than 90 Days Past Due [Member] BUSINESS COMBINATIONS Business Combination [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Customer advance balance Program Agreement, Outstanding Amount Program Agreement, Outstanding Amount Income before income taxes Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Other non-current liabilities Other Liabilities, Noncurrent Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Warrant exercised (in shares) Class of Warrant or Right, Exercised Class of Warrant or Right, Exercised Goodwill, impairment loss Goodwill, Impairment Loss Statement of Stockholders' Equity [Abstract] Capitalized share-based compensation expense Share-Based Payment Arrangement, Amount Capitalized Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Interest expense Interest Expense, Operating Recoveries Off-Balance-Sheet, Credit Loss, Liability, Allowance For Credit Loss, Recovery Off-Balance-Sheet, Credit Loss, Liability, Allowance For Credit Loss, Recovery Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Name Measure Name Other Other Transaction-Based Revenues [Member] Other Transaction-Based Revenues Schedule of Share-Based Compensation Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Current operating lease liabilities Operating Lease, Liability, Current Class of Stock [Line Items] Class of Stock [Line Items] Document Fiscal Period Focus Document Fiscal Period Focus Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Award Type [Axis] Award Type [Axis] Contract liabilities, noncurrent Contract with Customer, Liability, Noncurrent Segregated cash and cash equivalents, end of the period Cash Segregated under Other Regulations Contract with Customer, Receivable, Allowance for Credit Loss [Roll Forward] Contract with Customer, Asset, Allowance for Credit Loss [Roll Forward] Legal Entity [Axis] Legal Entity [Axis] Total assets Assets Schedule of Activity Related to TradePMR RSUs Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year One Trading Symbol(s) Trading Symbol Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Decrease to other non-current assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Noncurrent Assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Noncurrent Assets Issuance of common stock in connection with stock option exercises (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Address, City Entity Address, City or Town Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Noncurrent prepaid assets Prepaid Expense, Noncurrent Operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Receivable Type [Axis] Receivable Type [Axis] Weighted average useful life Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Effect of foreign exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Concentration Risk Type [Axis] Concentration Risk Type [Axis] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Market-Based RSUs Market-Based Restricted Stock Units (RSUs) [Member] Market-Based Restricted Stock Units (RSUs) Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Interest expenses related to credit facilities Interest Expense, Borrowings Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Consideration transferred Business Combination, Consideration Transferred Assets Assets, Fair Value Disclosure [Abstract] 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Four Entity Emerging Growth Company Entity Emerging Growth Company Fair Value Total Total held-to-maturity investments Debt Securities, Held-to-Maturity, Fair Value Credit Score, FICO [Axis] Credit Score, FICO [Axis] Marketing Marketing Expense Warrants Warrant [Member] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Schedule of Held-to-Maturity Investments Debt Securities, Held-to-Maturity [Table Text Block] Lease liabilities arising from obtaining right-of-use assets Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Operations Operating Expense [Member] Repayments on credit facilities Repayments of Lines of Credit 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] Level 2 Fair Value, Inputs, Level 2 [Member] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Indefinite-lived intangible assets Indefinite-Lived Intangible Assets (Excluding Goodwill) Business Combination [Domain] Business Combination [Domain] Common Class C Common Class C [Member] Common stock, shares outstanding (in shares) Balance at beginning of period, common stock (in shares) Balance at end of period, common stock (in shares) Common Stock, Shares, Outstanding Asset Pledged as Collateral Asset Pledged as Collateral [Member] Provision for credit losses Provision for credit losses Accounts Receivable, Credit Loss Expense (Reversal) Settlement date basis, equities Securities Transactions, Settlement Date Basis, Equities Securities Transactions, Settlement Date Basis, Equities Schedule of Income Tax Provision (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Plan Name [Axis] Plan Name [Axis] Unrealized Losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Other current assets Other Assets, Fair Value Disclosure PEO PEO [Member] Borrowings by the Credit Card Funding Trust Proceeds from Issuance of Secured Debt Schedule of Revenue Disaggregated by Revenue Source Disaggregation of Revenue [Table Text Block] Schedule of Amortized Cost and Fair Value of Held-to-Maturity Investments by Contractual Maturity Date Investments Classified by Contractual Maturity Date [Table Text Block] Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Shares issued under plans (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Liabilities Securities Sold under Agreements to Repurchase [Abstract] Changes in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] 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] Schedule of Future Amortization Expense in Acquired Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Accumulated deficit Retained Earnings [Member] Number of RSUs Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Pledged Status [Domain] Pledged Status [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Schedule of Assets and Liabilities Lessee Schedule Of Assets And Liabilities Lessee [Table Text Block] Schedule Of Assets And Liabilities Lessee Cash, cash equivalents, segregated cash, and restricted cash, beginning of the period Cash, cash equivalents, segregated cash, and restricted cash, end of the period Cash, cash equivalents, segregated cash and restricted cash, end of the period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Provision for income taxes Income Tax Expense (Benefit) Variable rate on loan Debt Instrument, Basis Spread on Variable Rate Common Class B Class B Common Class B [Member] Net amount Security Borrowed, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Greater than 690 FICO Score, Greater Than 690 [Member] FICO Score, Greater Than 690 Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Intangible assets, net Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Provision for credit losses Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) Grant value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants Value Product and Service [Domain] Product and Service [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Customer Concentration Risk Customer Concentration Risk [Member] Offsetting [Abstract] Within 1 Year Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Secured Overnight Financing Rate, Interest Period Of One Month Secured Overnight Financing Rate, Interest Period Of One Month [Member] Secured Overnight Financing Rate, Interest Period Of One Month Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Share repurchase program period Share Repurchase Program, Period in Force Total financial liabilities Liabilities, Fair Value Disclosure Business Combination [Table] Business Combination [Table] Securities borrowed Increase (Decrease) in Securities Borrowed Line Of Credit, Condition [Axis] Line Of Credit, Condition [Axis] Line Of Credit, Condition Purchases of property, software, and equipment Payments to Acquire Other Productive Assets Operating cash flows: Cash Flow, Operating Activities, Lessee [Abstract] Schedule of Acquisition Date Fair Value of Consideration Transferred Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Additions Goodwill, Acquired During Period Proceeds from exercise of stock options Proceeds from Stock Options Exercised City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] 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] All others individually less than 10% Other Customer [Member] Capitalization of internally developed software Payments to Develop Software Unvested restricted stock, beginning balance (in shares) Unvested restricted stock, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] TradePMR TradePMR [Member] TradePMR Settlement date basis, options Securities Transactions, Settlement Date Basis, Options Securities Transactions, Settlement Date Basis, Options Schedule of Contract Receivables and Liabilities Balances Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] General and administrative General and Administrative Expense Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Proceeds from maturities of held-to-maturity investments Proceeds from Sale and Maturity of Held-to-Maturity Securities Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation 1 to 2 Years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, After Allowance For Credit Loss, Maturity, Allocated And Single Maturity Date, After Year One Through Two Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, After Allowance For Credit Loss, Maturity, Allocated And Single Maturity Date, After Year One Through Two March 2024 credit facility March 2025 Credit Facility [Member] March 2025 Credit Facility Line of credit facility, term Debt Instrument, Term Line of credit facility, increase limit Line Of Credit Facility, Increase Limit Line Of Credit Facility, Increase Limit Other revenues Financial Service, Other [Member] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Other current assets Business Combination, Recognized Asset Acquired, Other Asset, Current Net interest revenues Total net interest revenues Interest revenue and expense Interest Income (Expense), Operating Goodwill Beginning balance Ending balance Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Schedule of Cash Flows Lease, Cost [Table Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Money market funds Money Market Funds [Member] Beginning balance Ending Balance Contract with Customer, Receivable, Allowance for Credit Loss RHS March 2025 Credit Agreement RHS March 2025 Credit Agreement [Member] RHS March 2025 Credit Agreement Bitstamp Bitstamp [Member] Bitstamp FINRA Settlement FINRA Settlement [Member] FINRA Settlement Remainder of 2025 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Denominator Weighted Average Number of Shares Outstanding, Basic [Abstract] Equity Components [Axis] Equity Components [Axis] Provision for credit losses Credit and Debit Card Receivables, at Carrying Value Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Proxy revenues Proxy Revenues [Member] Proxy Revenues Concentration Risk [Table] Concentration Risk [Table] Transaction-based revenues Transaction-Based Revenues [Member] Transaction-Based Revenues Amortized cost Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date [Abstract] RHM March 2025 Credit Facility RHM March 2025 Credit Agreement [Member] RHM March 2025 Credit Agreement DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Supplemental disclosures: Supplemental Cash Flow Information [Abstract] Receivable from users, net Business Combination, Recognized Asset Acquired, Receivable, Current Fractional shares repurchase obligation Fractional Shares Repurchase Obligation Amount Fractional Shares Repurchase Obligation Amount Other Performance Measure, Amount Other Performance Measure, Amount Payments of debt issuance costs Payments of Debt Issuance Costs Held-to-maturity investments Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Current Entity Address, State Entity Address, State or Province Federal Reserve Bank of New York Rate Federal Reserve Bank of New York Rate [Member] Federal Reserve Bank of New York Rate Financial Asset, Aging [Domain] Financial Asset, Aging [Domain] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Market-Based RSUs Not Eligible to Vest Market-Based Restricted Stock Units (RSUs) Not Eligible To Vest [Member] Market-Based Restricted Stock Units (RSUs) Not Eligible To Vest Brokerage and transaction Floor Brokerage, Exchange and Clearance Fees Securities pledged Financial Instruments, Owned, at Fair Value Numerator Net Income (Loss) Attributable to Parent, Diluted [Abstract] Current and non-current deferred customer match incentives Increase (Decrease) in Deferred Charges Total current liabilities Liabilities, Current Individual: Individual [Axis] Net income attributable to common stockholders: Earnings Per Share Reconciliation [Abstract] Other current assets Other Assets, Current Entities [Table] Entities [Table] Entity [Domain] Entity [Domain] Net cash provided by (used in) 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] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Consideration transferred for business acquisitions Cash, Cash Equivalents and Segregated Cash Acquired In Business Acquisitions Cash, Cash Equivalents and Segregated Cash Acquired In Business Acquisitions Operating lease assets Operating Lease, Right-of-Use Asset COMMON STOCK AND STOCKHOLDERS' EQUITY Shareholders' Equity and Share-Based Payments [Text Block] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Effective tax rate Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Program Agreement Interest Rate Margin [Domain] Program Agreement, Interest Rate Margin [Domain] Program Agreement, Interest Rate Margin [Domain] Shares repurchase, increased amount Share Repurchase Program, Increased Authorized, Amount Share Repurchase Program, Increased Authorized, Amount Plan Name [Domain] Plan Name [Domain] Unrecognized compensation cost related to outstanding stock options, weighted-average period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Equity [Abstract] Stablecoin Stablecoin [Member] Stablecoin Thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Four Finite-Lived Intangible Asset, Expected Amortization, after Year Four Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] U.S. Treasury securities US Treasury Securities [Member] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] ALLOWANCE FOR CREDIT LOSSES Allowance for Credit Losses [Text Block] Increase (decrease) in stockholder's equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Technology and development Technology and Development Expense [Member] Technology and Development Expense Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Amortization expense of intangible assets Amortization of Intangible Assets Depreciation and amortization Depreciation, Depletion and Amortization Other non-current assets, including non-current prepaid expenses of $17 as of December 31, 2024 and $15 as of June 30, 2025 Other Assets, Noncurrent Customer [Domain] Customer [Domain] Entity Central Index Key Entity Central Index Key PEO Name PEO Name RHM March 2025 Credit Facility, Tranche B and C RHM March 2025 Credit Facility, Tranche B and C [Member] RHM March 2025 Credit Facility, Tranche B and C Total net revenues Total net revenues Revenues 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] Schedule of Credit Quality Indicators Financing Receivable Credit Quality Indicators [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Reallocation of net income to Class B common stock Dilutive Securities, Effect on Basic Earnings, Dilutive Effect Of Reallocation Of Net Income To Common Stock Dilutive Securities, Effect on Basic Earnings, Dilutive Effect Of Reallocation Of Net Income To Common Stock Revolving Credit Facility Revolving Credit Facility [Member] Amount re-pledged with clearing organizations to meet deposit requirements Pledged Assets Separately Reported, Securities Pledged as Collateral with Clearing Organizations Pledged Assets Separately Reported, Securities Pledged as Collateral with Clearing Organizations Arrangement Duration Trading Arrangement Duration Payables to users Contract liabilities, current Contract with Customer, Liability, Current Exercise price (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Options Options [Member] Options Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Interest on segregated cash, cash equivalents, securities, and deposits Interest On Segregated Cash And Cash Equivalents, Securities And Deposits [Member] Interest On Segregated Cash And Cash Equivalents, Securities And Deposits Other Payment for (Proceeds from) Other Investing Activity Other Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Securities segregated under federal and other regulations Increase (Decrease) in Segregated Securities Under Federal and Other Regulations Increase (Decrease) in Segregated Securities Under Federal and Other Regulations Repurchase and retirement of Class A common stock (in shares) Stock Repurchased and Retired During Period, Shares Intangible assets Finite and indefinite intangible assets Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Cash and cash equivalents Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent Beginning balance Ending balance Off-Balance-Sheet, Credit Loss, Liability Assets Assets [Abstract] Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Debt Instrument [Axis] Debt Instrument [Axis] Common stock reserved for issuance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Reserved for Issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Reserved for Issuance Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Contract with Customer Liability [Domain] Contract with Customer Liability [Domain] Contract with Customer Liability [Domain] INVESTMENTS AND FAIR VALUE MEASUREMENT Fair Value Disclosures [Text Block] Change in principal collected from customers due to Coastal Bank Change In Customer Funds, Restricted From Use In Operations Change In Customer Funds, Restricted From Use In Operations Time deposits Bank Time Deposits [Member] Business Combination [Line Items] Business Combination [Line Items] Credit Facility [Domain] Credit Facility [Domain] Gross Carrying Value Finite-Lived Intangible Assets, Gross Stockholders’ equity: Equity, Attributable to Parent [Abstract] 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] Commercial Paper Rate Commercial Paper Rate [Member] Commercial Paper Rate Entity Address, Street Entity Address, Address Line One Assets Security Borrowed, Including Not Subject to Master Netting Arrangement, after Offset and Deduction [Abstract] Accumulated other comprehensive income (loss) AOCI Attributable to Parent [Member] Non-current operating lease liabilities Operating Lease, Liability, Noncurrent Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Coastal Bank Coastal Bank [Member] Coastal Bank Robinhood credit Robinhood Credit [Member] Robinhood Credit Fair Value as of Grant Date Award Grant Date Fair Value Entity Registrant Name Entity Registrant Name User-held fractional shares User-Held Fractional Shares, Amount User-Held Fractional Shares, Amount Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] SVB and Barclays Arragements SVB and Barclays Arragements [Member] SVB and Barclays Arragements Decrease to other current assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Current Assets Business Combination, Provisional Information, 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