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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 28, 2025
Jan. 01, 2025
Jan. 01, 2024
Cover [Abstract]        
Document Type 10-K      
Amendment Flag false      
Document Period End Date Dec. 31, 2024      
Document Fiscal Year Focus 2024      
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      
Document Financial Statement Error Correction [Flag] 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   1,736,694    
Entity Interactive Data Current Yes      
Notional capital granted and issued   $ 440,465,500 $ 196,000,000 $ 263,000,000
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      
Auditor Opinion [Text Block]

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated statements of financial condition of The Jones Financial Companies, L.L.L.P. and its subsidiaries (the "Partnership") as of December 31, 2024 and 2023, and the related consolidated statements of income, of comprehensive loss, of changes in partnership capital and profits interests subject to mandatory redemption and of cash flows for each of the three years in the period ended December 31, 2024, including the related notes and financial statement schedules listed in the index appearing under Item 15(a)(2) (collectively referred to as the "consolidated financial statements"). We also have audited the Partnership's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework(2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Partnership as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Partnership maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.