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SCHEDULE IV — REINSURANCE (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Gross Amount $ 4,733 $ 4,218 $ 3,589
Ceded to Other Companies 1,807 1,513 1,498
Assumed from Other Companies 10,518 9,082 8,315
Net premiums earned 13,443 11,787 10,406
Total property and liability insurance premiums earned      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Gross Amount 4,733 4,218 3,589
Ceded to Other Companies 1,807 1,513 1,498
Assumed from Other Companies 10,518 9,082 8,315
Net premiums earned $ 13,443 $ 11,787 $ 10,406
Assumed to Net 78.20% 77.10% 79.90%