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SEGMENT REPORTING - Schedule of Underwriting Results for Segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Gross written premiums $ 16,637 $ 13,952 $ 13,050
Net written premiums 14,730 12,344 11,446
Premiums earned 13,443 11,787 10,406
Incurred losses and LAE 8,427 8,100 7,391
Commission and brokerage 2,952 2,528 2,209
Other underwriting expenses 846 682 583
Underwriting gain (loss) 1,219 477 224
Net investment income 1,434 830 1,165
Net gains (losses) on investments (276) (455) 258
Corporate expenses (73) (61) (68)
Interest, fee and bond issue cost amortization expense (134) (101) (70)
Other income (expense) (14) (102) 37
INCOME (LOSS) BEFORE TAXES 2,154 588 1,546
Reinsurance      
Segment Reporting Information [Line Items]      
Gross written premiums 11,460 9,248 9,018
Net written premiums 10,802 8,919 8,488
Premiums earned 9,799 8,598 7,708
Incurred losses and LAE 5,696 5,966 5,543
Commission and brokerage 2,520 2,116 1,833
Other underwriting expenses 255 217 198
Underwriting gain (loss) 1,328 300 135
Insurance      
Segment Reporting Information [Line Items]      
Gross written premiums 5,177 4,704 4,032
Net written premiums 3,929 3,426 2,958
Premiums earned 3,644 3,189 2,698
Incurred losses and LAE 2,732 2,134 1,848
Commission and brokerage 432 413 376
Other underwriting expenses 591 464 385
Underwriting gain (loss) $ (109) $ 178 $ 89