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SEGMENT REPORTING - Schedule of Underwriting Results for Segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Gross written premiums $ 18,232 $ 16,637 $ 13,952
Net written premiums 15,814 14,730 12,344
Premiums earned 15,187 13,443 11,787
Incurred losses and LAE 11,305 8,427 8,100
Commission and brokerage 3,300 2,952 2,528
Other underwriting expenses 938 846 682
Underwriting gain (loss) (356) 1,219 477
Net investment income 1,954 1,434 830
Net gains (losses) on investments 19 (276) (455)
Corporate expenses (95) (73) (61)
Interest, fee and bond issue cost amortization expense (149) (134) (101)
Other income (expense) 121 (14) (102)
INCOME (LOSS) BEFORE TAXES 1,493 2,154 588
Reinsurance      
Segment Reporting Information [Line Items]      
Gross written premiums 12,941 11,460 9,246
Net written premiums 11,969 10,802 8,917
Premiums earned 11,412 9,799 8,596
Incurred losses and LAE 7,103 5,690 5,962
Commission and brokerage 2,837 2,520 2,116
Other underwriting expenses 290 254 216
Underwriting gain (loss) 1,181 1,334 302
Insurance      
Segment Reporting Information [Line Items]      
Gross written premiums 5,078 4,888 4,426
Net written premiums 3,678 3,704 3,223
Premiums earned 3,579 3,420 2,998
Incurred losses and LAE 3,622 2,471 2,040
Commission and brokerage 439 410 399
Other underwriting expenses 615 556 438
Underwriting gain (loss) (1,097) (18) 121
Other      
Segment Reporting Information [Line Items]      
Gross written premiums 212 289 279
Net written premiums 167 225 204
Premiums earned 197 225 194
Incurred losses and LAE 580 266 98
Commission and brokerage 24 22 14
Other underwriting expenses 33 35 28
Underwriting gain (loss) $ (440) $ (98) $ 54