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Schedule IV - Reinsurance (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Gross Amount $ 4,218 $ 3,589 $ 3,028
Ceded to Other Companies 1,513 1,498 1,401
Assumed from Other Companies 9,082 8,315 7,055
Net premiums earned 11,787 10,406 8,682
Total Property and Liability Insurance [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Gross Amount 4,218 3,589 3,028
Ceded to Other Companies 1,513 1,498 1,401
Assumed from Other Companies 9,082 8,315 7,055
Net premiums earned $ 11,787 $ 10,406 $ 8,682
Assumed to Net 77.10% 79.90% 81.30%