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SCHEDULE IV — REINSURANCE (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Gross Amount $ 4,977 $ 4,733 $ 4,218
Ceded to Other Companies 2,248 1,807 1,513
Assumed from Other Companies 12,458 10,518 9,082
Net Amount 15,187 13,443 11,787
Total property and liability insurance premiums earned      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Gross Amount 4,977 4,733 4,218
Ceded to Other Companies 2,248 1,807 1,513
Assumed from Other Companies 12,458 10,518 9,082
Net Amount $ 15,187 $ 13,443 $ 11,787
Assumed to Net 82.00% 78.20% 77.10%