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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

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