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SEGMENT REPORTING - Schedule of Underwriting Results for Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Gross written premiums $ 4,375 $ 4,425 $ 13,446 $ 13,561
Net written premiums 3,754 3,805 11,607 11,789
Premiums earned 3,855 3,918 11,698 11,262
Incurred losses and LAE 2,837 2,584 8,203 7,132
Commission and brokerage 890 826 2,595 2,398
Other underwriting expenses 258 236 750 694
Underwriting gain (loss) (130) 272 151 1,039
Net investment income 540 496 1,563 1,481
Net gains (losses) on investments (47) (27) (59) (50)
Corporate expenses (27) (25) (79) (69)
Interest, fee and bond issue cost amortization expense (38) (38) (114) (112)
Other income (expense) (29) (102) (129) (48)
INCOME (LOSS) BEFORE TAXES 269 577 1,332 2,241
Reinsurance        
Segment Reporting Information [Line Items]        
Gross written premiums 3,206 3,265 9,668 9,650
Net written premiums 2,885 2,975 8,773 8,950
Premiums earned 2,892 2,970 8,835 8,429
Incurred losses and LAE 1,678 1,942 5,673 5,266
Commission and brokerage 764 710 2,223 2,054
Other underwriting expenses 74 73 221 215
Underwriting gain (loss) 376 245 717 895
Insurance        
Segment Reporting Information [Line Items]        
Gross written premiums 1,147 1,110 3,706 3,728
Net written premiums 848 789 2,767 2,694
Premiums earned 939 898 2,772 2,679
Incurred losses and LAE 996 605 2,280 1,744
Commission and brokerage 121 110 355 325
Other underwriting expenses 178 154 518 454
Underwriting gain (loss) (357) 28 (381) 156
Other        
Segment Reporting Information [Line Items]        
Gross written premiums 22 50 72 183
Net written premiums 21 41 68 145
Premiums earned 24 50 92 154
Incurred losses and LAE 163 37 250 122
Commission and brokerage 6 5 16 19
Other underwriting expenses 5 8 11 24
Underwriting gain (loss) $ (149) $ (1) $ (185) $ (11)