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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Jan. 31, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Period End Date Dec. 31, 2023    
Entity File Number 001-15811    
Entity Registrant Name MARKEL GROUP INC.    
Entity Incorporation, State or Country Code VA    
Entity Tax Identification Number 54-1959284    
Entity Address, Address Line One 4521 Highwoods Parkway    
Entity Address, City or Town Glen Allen    
Entity Address, State or Province VA    
Entity Address, Postal Zip Code 23060-6148    
City Area Code 804    
Local Phone Number 747-0136    
Title of 12(b) Security Common Stock, no par value    
Trading Symbol MKL    
Security Exchange Name NYSE    
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    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Document Annual Report true    
Document Transition Report false    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001096343    
Current Fiscal Year End Date --12-31    
Entity Public Float     $ 18,051,000,000
Entity Common Stock, Shares Outstanding   13,110,035  
Documents Incorporated by Reference The portions of the registrant's Proxy Statement for the Annual Meeting of Shareholders scheduled to be held on May 22, 2024, referred to in Part III.    
Auditor Name KPMG LLP    
Auditor Location Richmond, VA    
Auditor Firm ID 185