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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)

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