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REINSURANCE (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reinsurance Disclosures [Abstract]      
Written premiums: Direct $ 5,031 $ 4,602 $ 3,988
Written premiums: Assumed 11,606 9,350 9,062
Written premiums: Ceded (1,907) (1,608) (1,604)
Net written premiums 14,730 12,344 11,446
Premiums earned: Direct 4,733 4,218 3,589
Premiums earned: Assumed 10,518 9,082 8,315
Premiums earned: Ceded (1,807) (1,513) (1,498)
Net premiums earned 13,443 11,787 10,406
Incurred losses and LAE: Direct 3,209 2,804 2,385
Incurred losses and LAE: Assumed 5,870 6,285 5,741
Incurred losses and LAE: Ceded (651) (988) (735)
Net incurred losses and LAE $ 8,427 $ 8,100 $ 7,391