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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Feb. 25, 2022
Cover [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Period End Date Dec. 31, 2021  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus FY  
Entity Registrant Name JONES FINANCIAL COMPANIES LLLP  
Entity Central Index Key 0000815917  
Current Fiscal Year End Date --12-31  
Entity Well-known Seasoned Issuer No  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Non-accelerated Filer  
Entity Shell Company false  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity File Number 0-16633  
Entity Tax Identification Number 43-1450818  
Entity Address, Address Line One 12555 Manchester Road  
Entity Address, City or Town Des Peres  
Entity Address, State or Province MO  
Entity Address, Postal Zip Code 63131  
City Area Code 314  
Local Phone Number 515-2000  
Entity Incorporation, State or Country Code MO  
Entity Limited Partnership Interests Outstanding   1,226,808
Entity Interactive Data Current Yes  
Entity Public Float   $ 0
ICFR Auditor Attestation Flag true  
Document Annual Report true  
Document Transition Report false  
Documents Incorporated by Reference

None

  
Auditor Firm ID 238  
Auditor Name PricewaterhouseCoopers, LLP  
Auditor Location St. Louis, Missouri