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SEGMENT REPORTING - Schedule of Underwriting Results for Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Gross written premiums $ 4,425 $ 4,391 $ 13,561 $ 12,314
Net written premiums 3,805 3,866 11,789 10,870
Premiums earned 3,918 3,513 11,262 9,865
Incurred losses and LAE 2,584 2,246 7,132 6,173
Commission and brokerage 826 752 2,398 2,099
Other underwriting expenses 236 215 694 620
Underwriting gain (loss) 272 301 1,039 974
Net investment income 496 406 1,481 1,023
Net gains (losses) on investments (27) (31) (50) (21)
Corporate expenses (25) (19) (69) (55)
Interest, fee and bond issue cost amortization expense (38) (34) (112) (99)
Other income (expense) (102) 103 (48) 61
INCOME (LOSS) BEFORE TAXES 577 725 2,241 1,883
Reinsurance        
Segment Reporting Information [Line Items]        
Gross written premiums 3,265 3,198 9,650 8,566
Net written premiums 2,975 2,989 8,950 8,048
Premiums earned 2,970 2,593 8,429 7,183
Incurred losses and LAE 1,942 1,653 5,267 4,443
Commission and brokerage 710 643 2,054 1,778
Other underwriting expenses 73 65 215 189
Underwriting gain (loss) 245 232 893 772
Insurance        
Segment Reporting Information [Line Items]        
Gross written premiums 1,160 1,193 3,911 3,748
Net written premiums 830 878 2,839 2,822
Premiums earned 948 920 2,833 2,682
Incurred losses and LAE 642 593 1,865 1,730
Commission and brokerage 116 108 344 320
Other underwriting expenses 163 151 478 431
Underwriting gain (loss) $ 27 $ 69 $ 145 $ 202