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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

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