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Variable Interest Entities (Markel CATCo Re Balance Sheet) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]        
Cash and cash equivalents $ 4,354,858 $ 4,137,432    
Restricted cash and cash equivalents 690,004 1,084,081    
Total Assets 52,748,716 49,791,259    
Unpaid losses and loss adjustment expenses 22,144,366 20,947,898 $ 20,194,374 $ 18,178,894
Other liabilities 3,590,807 3,461,482    
Total Liabilities 38,226,087 36,054,220    
Shareholders' equity 13,999,159 13,151,094    
Noncontrolling interests 56,084 62,791    
Total Equity 14,055,243 13,213,885    
Total Liabilities and Equity 52,748,716 49,791,259    
Markel CATCo Re        
Variable Interest Entity [Line Items]        
Cash and cash equivalents 70,852 104,443    
Restricted cash and cash equivalents 193,778 317,577    
Other assets and receivables due from cedents 19,416 41,357    
Total Assets 284,046 463,377    
Unpaid losses and loss adjustment expenses 201,026 347,921    
Other liabilities 1,232 26,717    
Total Liabilities 202,258 374,638    
Shareholders' equity 21,139 21,139    
Noncontrolling interests 60,649 67,600    
Total Equity 81,788 88,739    
Total Liabilities and Equity $ 284,046 $ 463,377