Business Acquisition [Axis] Business Acquisition [Axis] DW SEF Dw Sef Llc [Member] DW SEF LLC (DW SEF) is a swap execution facility regulated by the Commodities Future Trading Commission. TWL Tradeweb Llc [Member] Tradeweb LLC (TWL) is a registered broker-dealer under the Securities Exchange Act of 1934, a member of the Financial Industry Regulatory Authority, a registered independent introducing broker with the Commodities Future Trading Commission and a member of the National Futures Association. Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Total future lease payments Lessee, Operating Lease, Liability, to be Paid Translation of Foreign Currency and Foreign Currency Forward Contracts Foreign Currency Transactions and Translations Policy [Policy Text Block] Net income Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Credit loss expense recognized Accounts Receivable, Credit Loss Expense (Reversal) Related Party Transactions [Abstract] Related Party Transactions [Abstract] Deferred tax asset Deferred Income Tax Assets, Net Letter of credit issued Long-Term Debt, Gross Income Tax Disclosure [Table] Income Tax Disclosure [Table] Disclosure of information pertaining to income taxes. Entity Address, Postal Zip Code Entity Address, Postal Zip Code Wholesale Wholesale Client Sector [Member] The wholesale client sector. Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Business Combinations Business Combinations Policy [Policy Text Block] TW SEF Tw Sef Llc [Member] TW SEF LLC (TW SEF) is a swap execution facility regulated by the Commodities Future Trading Commission. Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Foreign currency forward contracts Foreign Exchange Contract [Member] Floor Debt Instrument Floor Rate The Percentage of floor rate under debt instrument. Additional paid-in capital Additional Paid in Capital Percentage of amount of U.S. federal, state and local income or franchise tax savings Tax Receivable Agreement, Percentage Of Amount Of Federal, State And Local Income Or Franchise Tax Savings The percentage of amount of U.S. federal, state and local income or franchise tax savings under the tax receivable agreement. Spread Debt Instrument, Basis Spread on Variable Rate Tax receivable agreement liability adjustment Tax Receivable Agreement Liability, Adjustment Tax Receivable Agreement Liability, Adjustment Regulatory Capital Requirements Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Statistical Measurement [Domain] Statistical Measurement [Domain] Depreciation expense Depreciation Schedule of Revenue and Long-Lived Assets by Geographic Location Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Long-lived assets Long-Lived Assets Effect of exchange rate changes on cash, cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Dividends Payable Dividends Payable Aggregate value of share repurchase Treasury Stock, Value, Acquired, Cost Method Net income attributable to Tradeweb Markets Inc. Net income attributable to Tradeweb Markets Inc. Net income attributable to Tradeweb Markets Inc. Net income attributable to Tradeweb Markets Inc. Net Income (Loss) Attributable to Parent Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive shares (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount TWEU Tradeweb Eu Bv [Member] Tradeweb EU B.V. (TWEU) is a trading venue and approved publication arrangement regulated by the Netherlands Authority for the Financial Markets. Subsequent Event Type [Axis] Subsequent Event Type [Axis] Fed Funds Effective Rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Equity Component [Domain] Equity Component [Domain] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Fair Value, Nonrecurring Fair Value, Nonrecurring [Member] Scenario [Axis] Scenario [Axis] Total assets measured at fair value Assets, Fair Value Disclosure Ownership [Axis] Ownership [Axis] Vest per year Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Related Party [Domain] Related Party [Domain] Fair Value Measurement Fair Value Measurement, Policy [Policy Text Block] Unsettled share repurchases included in other liabilities Unsettled Share Repurchases, Value Unsettled Share Repurchases, Value Hedging Designation [Domain] Hedging Designation [Domain] Supplemental disclosure of cash flow information Supplemental Cash Flow Information [Abstract] Derivative Instrument [Axis] Derivative Instrument [Axis] Noncontrolling Interest [Abstract] Noncontrolling Interest [Abstract] Common stock, conversion ratio Common Stock Conversion Ratio Common Stock Conversion Ratio Remainder of 2022 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Entity Address, State or Province Entity Address, State or Province Quoted Prices in active Markets for Identical Assets (Level 1) Quoted Prices in active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Refinitiv Direct Owner Refinitiv Direct Owner [Member] Refinitiv Direct Owner Award Type [Axis] Award Type [Axis] Equity Members' Equity [Abstract] Denominator: Weighted Average Number of Shares Outstanding, Basic [Abstract] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities LLC Interests Limited Liability Company Units [Member] Limited Liability Company Units Maximum performance modifier, percent Share-based Compensation Arrangement by Share-based Payment Award, Maximum Performance Modifier Share-based Compensation Arrangement by Share-based Payment Award, Maximum Performance Modifier Adjustments to reconcile net income to net cash provided by (used in) operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Excess Financial Resources Futures Commission Merchant, Commodity Exchange Act, Excess Net Capital Deferred tax asset Other Noncash Income Tax Expense Legal Entity [Axis] Legal Entity [Axis] Total liabilities Liabilities Number of share owned (in shares) Number of share owned Number of share owned. Geographical [Axis] Geographical [Axis] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Number of LLC Interests held by Tradeweb Markets Inc. (in shares) Minority Interest Number Of Interests Held By Parent The parent entity's interest in the subsidiary. Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Issuance of common stock from equity incentive plans Stock Issued During Period, Value, New Issues Receivable from affiliates Receivable from affiliates Receivable from affiliates – Foreign currency forward contracts Due from Affiliates Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Allowance for Credit Losses Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block] Revolving credit facility Revolving Credit Facility [Member] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Document Type Document Type Useful life Property, Plant and Equipment, Useful Life Reconciliation of cash, cash equivalents and restricted cash as shown on the statements of financial condition: Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract] Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities [Member] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Product and Service [Domain] Product and Service [Domain] Entity Shell Company Entity Shell Company Class B Common Stock Common Class B [Member] Deferred taxes Deferred Income Tax Expense (Benefit) Tax Receivable Agreement Tax Receivable Agreement Liability Disclosure [Text Block] The entire disclosure of tax receivable agreement liability. Deferred revenue Increase (Decrease) in Deferred Revenue 2023 Lessee, Operating Lease, Liability, to be Paid, Year One (Increase) decrease in operating assets: Increase (Decrease) in Operating Assets [Abstract] Affiliated Entity Affiliated Entity [Member] Payments on tax receivable agreement liability Payments on Tax Receivable Agreement, Liability Payments on Tax Receivable Agreement, Liability Subsequent Event Subsequent Event [Member] Schedule of Recognized Revenue and Remaining Deferred Revenue Balance Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Deposits with Clearing Organizations Deposits With Clearing Organizations [Policy Text Block] Disclosure of accounting policy for deposits with clearing organizations. Document Period End Date Document Period End Date Class C Common Stock Common Class C [Member] TESL Tradeweb Execution Services Limited [Member] Tradeweb Execution Services Limited Conversion ratio Noncontrolling Interest, Conversion Ratio The conversion ratio of shares of non-controlling interests. Employee equity compensation payable Increase Decrease In Equity Compensation Payable The increase (decrease) during the period in equity compensation payable. Total assets Assets Earnings per share attributable to Tradeweb Markets Inc. Class A and B common stockholders: Earnings Per Share [Abstract] Income Statement Location [Axis] Income Statement Location [Axis] Schedule of Fair Value Measurements Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Schedule of the Ownership Interest in Noncontrolling Interest Schedule Of Ownership Interest In Noncontrolling Interest [Table Text Block] Tabular disclosure of ownership interest in noncontrolling interest. Accrued compensation Employee-related Liabilities Tax Receivable Agreement Tax Receivable Agreement No definition available. Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Comprehensive income - Tradeweb Markets Inc. Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Accounting Policies [Abstract] Accounting Policies [Abstract] Schedule of Financial Resources and Liquid Financial Resources Futures Commission Merchant, Minimum Financial Requirement [Table Text Block] Share repurchase program, amount authorized Stock Repurchase Program, Authorized Amount Schedule of Regulatory Capital Requirements Schedule Of Regulatory Capital Requirements [Table Text Block] Tabular disclosure of the regulatory capital requirements and regulatory capital for entities subject to regulation. Income before taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Earnings Per Share Earnings Per Share [Text Block] Non-Controlling Interests Noncontrolling Interest Disclosure [Text Block] Payable to affiliates Payable to affiliates Due to Affiliate Customer [Axis] Customer [Axis] Increase/(decrease) in Tradeweb Markets Inc.’s additional paid-in capital as a result of ownership changes in TWM LLC Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Receivable from/payable to affiliates, net Increase (Decrease) Due from Affiliates Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Related Party Transactions Related Party Transaction [Line Items] Award Type [Domain] Award Type [Domain] EA Execution Access [Member] Execution Access Schedule of Financial Instruments Not Measured at Fair Value Fair Value, by Balance Sheet Grouping [Table Text Block] Derivative Contract [Domain] Derivative Contract [Domain] Entity Registrant Name Entity Registrant Name Issuance of common stock from equity incentive plans (in shares) Stock Issued During Period, Shares, New Issues Number of LLC Interests held by non-controlling interests (in shares) Minority Interest Number Of Interests Held By Noncontrolling Owners The equity interest of noncontrolling shareholders. Subsequent Events Subsequent Events [Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Software Development Costs Software Development [Member] Accounts payable, accrued expenses and other liabilities Accounts Payable and Accrued Liabilities Follow On Offering Follow On Offering [Member] Follow On Offering Entity Address, City or Town Entity Address, City or Town Securities Sold Under Agreements to Repurchase Repurchase and Resale Agreements Policy [Policy Text Block] Expenses Operating Expenses [Abstract] Total equity Beginning balance Ending balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Pushdown Accounting Consolidation, Policy [Policy Text Block] Adjustments to non-controlling interests Minority Interest Increase Decrease From Adjustments Amount of increase (decrease) in noncontrolling interest from adjustments. Minimum Minimum [Member] Non-controlling interests Stockholders' Equity Attributable to Noncontrolling Interest Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Occupancy Occupancy, Net Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Trading Symbol Trading Symbol Entity File Number Entity File Number Transaction fees and commissions Transaction fees and commissions Transaction Fee Revenue [Member] Transaction fee revenues, both variable and fixed, recorded at a point in time when the trade occurs. Average price per share (in dollars per share) Treasury Stock Acquired, Average Cost Per Share Excess Regulatory Capital Excess Regulatory Capital Amount by which the entity's regulatory capital (as defined) exceeds the requirement. Subscription fees Subscription Fee And Market Data Revenue [Member] Subscription fee revenue from granting access to institutional investors to the entity's electronic marketplaces and fees from the sale of market data to Refinitiv. Credit Risk Allowance for Credit Losses [Text Block] Comprehensive income attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Adjusted For Refinitiv Transaction Adjusted For Refinitiv Transaction [Member] Reflects a new basis of accounting resulting from the Refinitiv transaction. Title of Individual [Axis] Title of Individual [Axis] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period RSUs Restricted Stock Units (RSUs) [Member] Entity Information [Line Items] Entity Information [Line Items] Effective tax rate Effective Income Tax Rate Reconciliation, Percent Use of Estimates Use of Estimates, Policy [Policy Text Block] Cash equivalents – Money market funds Cash and Cash Equivalents, Fair Value Disclosure Restricted Cash Equivalents [Abstract] Restricted Cash Equivalents [Abstract] Remaining percentage of tax benefits Tax Receivable Agreement Remaining Percentage of Amount of Federal State and Local Income or Franchise Tax Savings The remaining percentage of amount of U.S. federal, state and local income or franchise tax savings under the tax receivable agreement. LIBOR London Interbank Offered Rate (LIBOR) [Member] Consulting service fee for follow on offering Consulting Service Fee for Follow on Offering The amount of consulting service incurred for follow on offering. Subsequent Events [Abstract] Subsequent Events [Abstract] Revenue Revenues Retirement notice, term Retirement Notice, Term Retirement Notice, Term Accounts payable, accrued expenses and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Limited Liability Company (LLC) Members' Equity [Abstract] Limited Liability Company (LLC) Members' Equity [Abstract] Income Taxes Income Tax Disclosure [Text Block] Increase (decrease) in operating liabilities: Increase (Decrease) in Operating Liabilities [Abstract] Amortization expense Amortization of Intangible Assets Basic (in dollars per share) Earnings per share - Basic (in dollars per share) Earnings Per Share, Basic One-month LIBOR One Month London Inter Bank Offered Rate [Member] One Month London Inter Bank Offered Rate. 2025 Lessee, Operating Lease, Liability, to be Paid, Year Three Deposits with clearing organizations Deposits with clearing organizations Deposits with Clearing Organizations and Others, Securities Business Segment and Geographic Information Revenues from External Customers and Long-Lived Assets [Line Items] Change in Contract with Customer Change In Contract with Customer, Liability [Roll Forward] Change In Contract with Customer, Liability Multiplier achieved, percentage Share-based Payment Arrangement, Multiplier Achieved, Percent Share-based Payment Arrangement, Multiplier Achieved, Percent Adjustment increase (decrease) Share-based Payment Arrangement, Multiplier Achieved, Adjustment Increase (Decrease) Share-based Payment Arrangement, Multiplier Achieved, Adjustment Increase (Decrease) Total stockholders’ equity attributable to Tradeweb Markets Inc. Stockholders' Equity Attributable to Parent Non-employee director Director [Member] Ownership [Domain] Ownership [Domain] Entity Interactive Data Current Entity Interactive Data Current Non-Controlling Interests Noncontrolling Interest [Line Items] Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Furniture, Equipment, Purchased Software and Leasehold Improvements Furniture Equipment And Purchased Software [Member] Furniture, equipment and purchased software. Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Numerator: Net Income (Loss) Attributable to Parent [Abstract] Cash equivalents – Money market funds Money Market Funds [Member] Share-based payment arrangement, accelerated cost Share-Based Payment Arrangement, Accelerated Cost Retained Earnings Retained Earnings [Member] Business Segment and Geographic Information Segment Reporting Information [Line Items] Total LLC Interests outstanding Minority Interest Total Ownership Percentage The total ownership interest on noncontrolling interest expressed as a percentage. Other Stockholders Other Stockholders [Member] Other Stockholders Common Stock Common Stock [Member] Schedule of Total Stock-based Compensation Expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Share repurchases pursuant to the Share Repurchase Program Payments for Repurchase of Common Stock Class of Stock [Axis] Class of Stock [Axis] Income Tax Income Tax, Policy [Policy Text Block] Statement [Table] Statement [Table] Document Quarterly Report Document Quarterly Report Expenses Interest Income, Securities, Operating, by Taxable Status [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Common stock repurchased (in shares) Treasury Stock, Shares, Acquired Total Fair Value Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Less: Foreign currency translation adjustments attributable to non-controlling interests Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest Retained earnings Retained Earnings (Accumulated Deficit) Accounts receivable, net of allowance for credit losses of $117 and $273 at June 30, 2022 and December 31, 2021, respectively Accounts receivable Account Receivable Excluding Receivable From Brokers And Dealers And Clearing Organizations, Net Of Allowance Account receivable excluding receivable from brokers and dealers and clearing organizations, net of allowance. Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Equity Components [Axis] Equity Components [Axis] Scenario, Unspecified [Domain] Scenario [Domain] Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Stock-based compensation expense under the RSU Plan APIC, Share-Based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition Document Fiscal Year Focus Document Fiscal Year Focus Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Statement [Line Items] Statement Statement [Line Items] Liquid Financial Assets Liquid Financial Assets Liquid financial assets calculated under the Commodity Exchange Act. Financial Resources Futures Commission Merchant, Commodity Exchange Act, Adjusted Net Capital Deferred IPO and Follow-On Offering Costs Deferred Charges, Policy [Policy Text Block] Variable Rate [Domain] Variable Rate [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Required Financial Resources Futures Commission Merchant, Commodity Exchange Act, Required Net Capital Loss Contingencies [Table] Loss Contingencies [Table] Lease right-of-use assets Operating Lease, Right-of-Use Asset Share repurchases pursuant to the Share Repurchase Program Stock Repurchased During Period, Value Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Equity Investments Without Readily Determinable Fair Values Equity Securities without Readily Determinable Fair Value [Policy Text Block] Receivable from and Payable to Broker and Dealers and Clearing Organizations Industry-Specific Policies, Broker-Dealer [Policy Text Block] Document Transition Report Document Transition Report Local Phone Number Local Phone Number Deferred costs Deferred Offering Costs Operating income Operating Income (Loss) Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Deposits with clearing organizations Increase (Decrease) in Deposit Assets Equity investment without readily determinable fair values Equity Securities without Readily Determinable Fair Value, Amount Adjustment to additional paid in capital due to consulting service fee Adjustment to Additional Paid in Capital due to Consulting Service Fee The amount of adjustment to additional paid in capital for consulting service fee. Accounts receivable Accounts Receivable, Related Parties Weighted average shares outstanding: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Goodwill Goodwill Shares contributed by Refinitiv Owner (in shares) Stock Contributed During Period Acquiree Majority Owner Stock Contributed During Period Acquiree Majority Owner Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] TWD Tradeweb Direct Llc [Member] Tradeweb Direct LLC (TWD) is a registered broker-dealer under the Securities Exchange Act of 1934, and a member of the Financial Industry Regulatory Authority. Share repurchases pursuant to the Share Repurchase Program (in shares) Stock Repurchased During Period, Shares Required Liquid Financial Assets Required Liquid Financial Assets Amount of liquid financial assets required to be maintained under the Commodity Exchange Act. Increase/(decrease) in Tradeweb Markets Inc.’s additional paid-in capital as a result of ownership changes in TWM LLC Noncontrolling Interest, Increase from Subsidiary Equity Issuance Provision for income taxes Income Tax Expense (Benefit) Geographical [Domain] Geographical [Domain] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Furniture, Equipment, Purchased Software and Leasehold Improvements Property, Plant and Equipment, Policy [Policy Text Block] Deferred tax liability Deferred Income Tax Liabilities, Net Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share 2026 Lessee, Operating Lease, Liability, to be Paid, Year Four Income Statement [Abstract] Income Statement [Abstract] Additional Paid-In Capital Additional Paid-in Capital [Member] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Document Fiscal Period Focus Document Fiscal Period Focus Derivative [Line Items] Derivative [Line Items] Diluted (in shares) Weighted average shares of Class A and Class B common stock outstanding - Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Intangible Assets Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Tradeweb Markets Inc Tradeweb Markets Inc [Member] Tradeweb Markets Inc., the reporting entity. Establishment of liabilities under tax receivable agreement Liabilities Assumed Commitments and Contingencies Loss Contingencies [Line Items] Deferred revenue Contract with Customer, Liability, Related Parties Amount of obligation to transfer good or service to related parties for which consideration has been received or is receivable. Software Development Costs Internal Use Software, Policy [Policy Text Block] General and administrative General and administrative Other General and Administrative Expense Base rate Base Rate [Member] Common stock Common Stock, Value, Issued Bank Stockholders Bank Stockholders [Member] Information relating to the Bank Stockholders. Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Tax receivable agreement liability and deferred taxes arising from LLC Interest ownership exchanges and the issuance of common stock from equity incentive plans Adjustments to Additional Paid in Capital Tax Receivable Agreement Liability and Deferred Taxes Reorganization Transaction and IPO Amount of decrease to additional paid in capital (APIC) resulting from tax receivable agreement liability and deferred taxes arising from the reorganization transactions and IPO. Weighted-average grant-date fair value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Change from net income attributable to Tradeweb Markets Inc. and transfers (to) from non-controlling interests Net Income Attributable To Parent And Transfers (To) From Noncontrolling Interest The amount of net income (loss) attributable to parent and transfers (to) from noncontrolling interests. Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] TEL Tradeweb Europe Limited [Member] Tradeweb Europe Limited (TEL) is a Multilateral Trading Facility regulated by the Financial Conduct Authority in the UK, which maintains branches in Asia which are regulated by certain Asian securities regulators. Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Net Income Per Share Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Beginning of period End of period Cash, cash equivalents and restricted cash shown in the statement of cash flows Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Foreign currency translation adjustments, with no tax benefit for each of the three and six months ended June 30, 2022 and 2021 Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Comprehensive income - Non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest [Abstract] Less: Net income attributable to non-controlling interests Less: Net income attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Net income attributable to outstanding shares of Class A and Class B common stock - Basic Net Income (Loss) Available to Common Stockholders, Basic Foreign currency forward contracts – Gross notional amount Foreign Exchange Forward [Member] Proceeds from stock-based compensation exercises Proceeds from Stock Options Exercised Common stock, shares issued (in shares) Common Stock, Shares, Issued Foreign currency transaction loss, before tax Foreign Currency Transaction Gain (Loss), before Tax Income Statement Location [Domain] Income Statement Location [Domain] Transaction costs Business Combination, Acquisition Related Costs Fair Value of Financial Instruments Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Amendment Flag Amendment Flag Useful life of intangible assets Finite-Lived Intangible Asset, Useful Life Refinitiv Refinitiv [Member] Refinitiv, formerly the Thomson Reuters Financial & Risk Business. Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Professional fees Professional fees Professional Fees Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Comprehensive income attributable to Tradeweb Markets Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Subscription fees Subscription fees Subscription Fee Revenue [Member] Subscription fee revenue from granting access to institutional investors to the entity's electronic marketplaces. Schedule of Information Regarding Revenue by Client Sector Schedule of Segment Reporting Information, by Segment [Table Text Block] Entity Current Reporting Status Entity Current Reporting Status Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Accrued compensation Increase (Decrease) in Employee Related Liabilities Nonrecurring Adjustment [Axis] Nonrecurring Adjustment [Axis] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] CEO Chief Executive Officer [Member] Initial term of lease Lessee, Operating Lease, Term of Contract Schedule of Balances From Transactions with Affiliates Included in the Consolidated Statements Schedule of Related Party Transactions [Table Text Block] Tradeweb Markets LLC TradeWeb Markets Llc [Member] Tradeweb Markets LLC. Derivative [Table] Derivative [Table] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Other assets – Memberships in clearing organizations Receivables from Clearing Organizations Variable Variable Pricing [Member] Contract with customer in which amount of consideration is based on variable components such as transaction based fees. Initial Public Offering IPO [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Liabilities Liabilities [Abstract] Furniture, equipment, purchased software and leasehold improvements, net of accumulated depreciation and amortization Property, Plant and Equipment, Net Employee compensation and benefits Employee compensation and benefits Labor and Related Expense Entities [Table] Entities [Table] Minimum performance modifier, percent Share-based Compensation Arrangement by Share-based Payment Award, Minimum Performance Modifier Share-based Compensation Arrangement by Share-based Payment Award, Minimum Performance Modifier Options Share-Based Payment Arrangement, Option [Member] Title of Individual [Domain] Title of Individual [Domain] Dividends Dividends Technology and communications Technology and communications Communications and Information Technology Fixed Fixed-Price Contract [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Other assets Other Assets Related Parties Other assets from related parties. Common Stock, shares authorized (in shares) Common Stock, Shares Authorized Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Foreign currency forward contracts not designated in accounting hedge relationship Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Maximum Maximum [Member] Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax 2019 Omnibus Equity Incentive Plan Omnibus2019 Equity Incentive Plan [Member] Represents the information pertaining to omnibus 2019 equity incentive plan. Class A Common Stock Common Class A [Member] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Income taxes paid, net of (refunds) Income Taxes Paid, Net Revenue recognized that was previously deferred Contract with Customer, Liability, Revenue Recognized Business Acquisition [Line Items] Business Acquisition [Line Items] Entity Small Business Entity Small Business Beginning balance ( in shares) Ending balance (in shares) Shares, Outstanding Measurement Frequency [Domain] Measurement Frequency [Domain] Number of reporting units Number of Reporting Units Distributions to non-controlling interests Payments Of Capital Distribution To Noncontrolling Interest Amount of cash outflow in the form of capital distribution to noncontrolling interests. Dividends (in dollars per share) Cash dividend declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Revenues Revenue: Revenues [Abstract] Distributions to non-controlling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Restricted cash Restricted cash Restricted Cash Significant Accounting Policies Significant Accounting Policies [Text Block] Unrecognized compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Revenues Disaggregation of Revenue [Abstract] DW Dealerweb [Member] Dealerweb Inc. (DW) is a registered broker-dealer under the Securities Exchange Act of 1934, a member of the Financial Industry Regulatory Authority, a registered independent introducing broker with the Commodities Future Trading Commission and a member of the National Futures Association. Effect of foreign currency exchange rate changes Contract With Customer, Liability, Foreign Currency Exchange Rate Contract With Customer, Liability, Foreign Currency Exchange Rate NFI Acquisition NFI Acquisition [Member] NFI Acquisition Nonrecurring Adjustment [Domain] Nonrecurring Adjustment [Domain] Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Accounts receivable Increase (Decrease) in Accounts Receivable Title of 12(b) Security Title of 12(b) Security Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Consolidated Entities [Axis] Consolidated Entities [Axis] Ownership percentage, continuing LLC Owners Number of LLC Interests held by non-controlling interests Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Total expenses Operating expenses Costs and Expenses Subsequent Event [Line Items] Subsequent Event [Line Items] New billings Contract With Customer Liability, New Billings Amount of deferred revenue recognized for new billing arising during the current reporting period. Lease liabilities Operating Lease, Liability Business Segment and Geographic Information Segment Reporting Disclosure [Text Block] Stock-Based Compensation Share-Based Payment Arrangement [Policy Text Block] Selling, General and Administrative Expenses Selling, General and Administrative Expenses [Member] Noncontrolling Interest [Table] Noncontrolling Interest [Table] Class C and Class D Common Stock Class C and Class D Common Stock [Member] Class C and Class D Common Stock Liabilities and Equity Liabilities and Equity [Abstract] Foreign currency translation adjustments attributable to Tradeweb Markets Inc. Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Excess Liquid Financial Assets Excess Liquid Financial Assets The amount by which actual liquid financial assets exceeds (does not exceed) required liquid financial assets under the Commodity Exchange Act Target performance modifier, percent Share-based Compensation Arrangement by Share-based Payment Award, Target Performance Modifier Share-based Compensation Arrangement by Share-based Payment Award, Target Performance Modifier Restricted Cash Restricted Assets Disclosure [Text Block] Other assets Increase (Decrease) in Other Operating Assets Total LLC Interests outstanding (in shares) Minority Interest Total Number Of Interests The total number of shares of the subsidiary. Hedging Designation [Axis] Hedging Designation [Axis] Class D Common Stock Common Class D [Member] Classification of common stock that has different rights than provided to other classes of common stock, representing interest in a corporation. Entity Filer Category Entity Filer Category Basic (in shares) Weighted average shares of Class A and Class B common stock outstanding - Basic (in shares) Weighted Average Number of Shares Outstanding, Basic U.S. UNITED STATES TWJ Tradeweb Japan Kk [Member] Tradeweb Japan K.K. (TWJ) is a security house regulated by the Japanese Financial Services Agency and the Japan Securities Dealers Association. Accounts payable, accrued expenses and other liabilities Accounts Payable, Accrued Expenses and Other Liabilities Related Parties Accounts Payable, Accrued Expenses and Other Liabilities Related Parties Total stock-based compensation expense Share-Based Payment Arrangement, Expense Non-cash financing activities Noncash Investing and Financing Items [Abstract] Commitments and contingencies (Note 12) Commitments and Contingencies Security Exchange Name Security Exchange Name Gross notional amount Derivative, Notional Amount Preferred stock, $0.00001 par value; 250,000,000 shares authorized; none issued or outstanding Preferred Stock, Value, Issued Letters of credit outstanding Letters of Credit Outstanding, Amount Furniture, Equipment, Purchased Software and Leasehold Improvements Property, Plant and Equipment [Line Items] Total revenue Total revenue Revenues Revenue from Contract with Customer, Excluding Assessed Tax Activities related to exchanges of LLC Interests (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Refinitiv market data fees Market Data Revenue [Member] Market data revenue earned from the sale of market data to Refinitiv, which redistributes the data. Includes real-time market data fees and historical data sets. Voting power percentage Voting power percentage Voting power percentage. Cover [Abstract] Leases Lessee, Leases [Policy Text Block] Significant Unobservable Inputs (Level 3) Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] PRSUs Equity Settled Performance Based Restricted Stock Units [Member] Equity Settled Performance Based Restricted Stock Units [Member] Impairment of goodwill Goodwill, Impairment Loss Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Stockholders' Equity and Stock-Based Compensation Plans Share-Based Payment Arrangement [Text Block] Accounts receivable, allowance for credit losses Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss Tax receivable agreement liability Tax Receivable Agreement Liability The carrying amount as on the balance sheet date of tax receivable agreement liability. Other assets Other Assets Revenue Revenue from Contract with Customer [Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Regulatory Capital Regulatory Capital Regulatory capital as calculated for each entity under applicable regulations. Non- Controlling Interests Noncontrolling Interest [Member] Forecast Forecast [Member] Net interest income (expense) Interest Income (Expense), Net Payroll taxes paid for stock-based compensation Payment, Tax Withholding, Share-Based Payment Arrangement Total liabilities and equity Liabilities and Equity Revolving credit facility, term Debt Instrument, Term Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Related Party [Axis] Related Party [Axis] Consulting service fee for IPO Consulting Service Fee for IPO The amount of consulting service incurred for IPO. Stock repurchase program, remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Dilutive securities (in shares) Dilutive effect (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements International Non-US [Member] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Revenue recognized Contract With Customer, Liability, Revenue Recognized Including New Billings Contract With Customer, Liability, Revenue Recognized Including New Billings Cash paid for acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Significant Observable Inputs (Level 2) Significant Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Current Fiscal Year End Date Current Fiscal Year End Date Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Regulatory Capital Requirements Regulatory Capital Requirements [Text Block] The entire disclosure of capital requirements and required financial resources under applicable regulations. Net income attributable to outstanding shares of Class A and Class B common stock - Diluted Net Income (Loss) Available to Common Stockholders, Diluted Intangible Assets Finite-Lived Intangible Assets [Line Items] Diluted (in dollars per share) Earnings per share - Diluted (in dollars per share) Earnings Per Share, Diluted Intangible assets, net of accumulated amortization Intangible Assets, Net (Excluding Goodwill) Sale of Stock [Domain] Sale of Stock [Domain] Maximum contractual term Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Offering costs incurred Payments of Stock Issuance Costs Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Four Lessee, Operating Lease, Liability, to be Paid, after Year Four Ownership interest Number of LLC Interests held by Tradeweb Markets Inc. Noncontrolling Interest, Ownership Percentage by Parent Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] 2024 Lessee, Operating Lease, Liability, to be Paid, Year Two Equity Incentive Plan Equity Incentive Plan [Member] Represents information about equity incentive plan. Less: Distributed and undistributed earnings allocated to unvested RSUs and unsettled vested PRSUs Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Commitment fee, percentage Line of Credit Facility, Commitment Fee Percentage Schedule of Derivative Values Schedule of Derivative Instruments [Table Text Block] Amortization expense Amortization Schedule of Maturity of Lease Liabilities and Future Minimum Lease Payments Lessee, Operating Lease, Liability, Maturity [Table Text Block] Entity Address, Address Line One Entity Address, Address Line One Receivable from/payable to brokers and dealers and clearing organizations, net Increase (Decrease) in Receivable from Broker-Dealer and Clearing Organization Deferred revenue Deferred revenue balance - beginning of period Deferred revenue balance - ending of period Contract with Customer, Liability Regulatory Capital Requirement Regulatory Capital Requirement Amount of regulatory capital required to be maintained for each entity under applicable regulations. Product and Service [Axis] Product and Service [Axis] Payable to brokers and dealers and clearing organizations Payable to brokers and dealers and clearing organizations Broker-Dealer, Payable to Other Broker-Dealer and Clearing Organization Class of Stock [Domain] Class of Stock [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] TWM LLC TWM LLC [Member] TWM LLC Subsequent Event [Table] Subsequent Event [Table] Schedule of Affiliates were Included in the Consolidated Statements of Income Schedule Of Related Party Transactions Affiliates [Table Text Block] Schedule Of Related Party Transactions Affiliates. Weighted average unvested RSUs and unsettled vested PRSUs that were considered participating securities (in shares) Participating Securities, Distributed and Undistributed Earnings (Loss), Shares Participating Securities, Distributed and Undistributed Earnings (Loss), Shares Entity Tax Identification Number Entity Tax Identification Number Number of shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized TESBV Tradeweb Execution Services B.V. [Member] Tradeweb Execution Services B.V. Schedule of Breakdown of Revenues Between Fixed and Variable Revenues Disaggregation of Revenue [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Stock-based compensation expense under the Option Plan APIC, Share-Based Payment Arrangement, Option, Increase for Cost Recognition Consolidated Entities [Domain] Consolidated Entities [Domain] Number of shares withheld (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Schedule of the Impact on Equity Due to Changes in the Company’s Ownership Interest in Noncontrolling Interest Schedule Of Impact On Equity Due To Changes In The Company’s Ownership Interest In Noncontrolling Interest [Table Text Block] Tabular disclosure of impact on equity due to changes in the Company’s ownership interest in noncontrolling interest. Other Other Other fees Financial Service, Other [Member] Net increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Market Data Market Data Client Sector [Member] The market data client sector. Entity Central Index Key Entity Central Index Key Measurement Frequency [Axis] Measurement Frequency [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Payroll taxes paid for stock-based compensation Share-based payment arrangement, decrease for tax withholding obligation Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Entity [Domain] Entity [Domain] Software development costs, net of accumulated amortization Capitalized Computer Software, Net Net transfers (to) from non-controlling interests Transfers From (To) Noncontrolling Interests Amount of net transfers from (to) non controlling interest. City Area Code City Area Code Assets Assets [Abstract] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Institutional Institutional Client Sector [Member] The institutional client sector. Capitalized software development costs Payments for Software Sale of Stock [Axis] Sale of Stock [Axis] Dividends Payments of Ordinary Dividends Receivable from brokers and dealers and clearing organizations Receivable from brokers and dealers and clearing organizations Receivable from Broker-Dealer and Clearing Organization Income Tax Disclosure [Line Items] Income Tax Disclosure [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. Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations [Abstract] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Retail Retail Client Sector [Member] The retail client sector. Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Public Investors Public Investors [Member] This member stands for public investors, collectively. Variable Rate [Axis] Variable Rate [Axis] Amortization of pushdown accounting allocation Amortization Period Pushdown Accounting Adjustment Amortization period for pushdown accounting adjustments. Cash and restricted cash Restricted Cash and Cash Equivalents, Fair Value Disclosure Restricted Cash and Cash Equivalents, Fair Value Disclosure Purchases of furniture, equipment, software and leasehold improvements Payments to Acquire Property, Plant, and Equipment Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Schedule of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Tax liability Accrued Income Taxes Foreign currency translation adjustment, tax benefit Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Customer [Domain] Customer [Domain]