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SCHEDULE IV — REINSURANCE (Details) - USD ($) $ in Millions | 12 Months Ended
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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%

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