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Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2022
Feb. 17, 2023
Jun. 30, 2022
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-38860    
Entity Registrant Name Tradeweb Markets Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 83-2456358    
Entity Address, Address Line One 1177 Avenue of the Americas    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10036    
City Area Code 646    
Local Phone Number 430-6000    
Title of 12(b) Security Class A common stock, par value $0.00001    
Trading Symbol TW    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 16.0
Documents Incorporated by Reference Part III of this Annual Report on Form 10-K incorporates by reference portions of the Registrant’s Proxy Statement for its 2023 Annual Meeting of Stockholders. The Proxy Statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2022.    
Entity Central Index Key 0001758730    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Amendment Flag false    
Class A Common Stock      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding (in shares)   111,225,889  
Class B Common Stock      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding (in shares)   96,933,192  
Class C Common Stock      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding (in shares)   3,251,177  
Class D Common Stock      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding (in shares)   23,090,904