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SEGMENT REPORTING - Schedule of Underwriting Results for Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Gross written premiums | $ 4,725 | $ 4,180 | $ 9,136 | $ 7,923
Net written premiums | 4,084 | 3,674 | 7,984 | 7,003
Premiums earned | 3,693 | 3,251 | 7,345 | 6,352
Incurred losses and LAE | 2,311 | 1,960 | 4,548 | 3,927
Commission and brokerage | 790 | 686 | 1,571 | 1,347
Other underwriting expenses | 234 | 205 | 458 | 405
Underwriting gain (loss) | 358 | 401 | 767 | 673
Net investment income | 528 | 357 | 985 | 617
Net gains (losses) on investments | (17) | 5 | (24) | 10
Corporate expenses | (22) | (17) | (44) | (36)
Interest, fee and bond issue cost amortization expense | (37) | (33) | (75) | (65)
Other income (expense) | 23 | 38 | 54 | (42)
INCOME (LOSS) BEFORE TAXES | 832 | 750 | 1,664 | 1,157
Reinsurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross written premiums | 3,209 | 2,747 | 6,385 | 5,368
Net written premiums | 3,033 | 2,621 | 5,975 | 5,059
Premiums earned | 2,731 | 2,364 | 5,459 | 4,590
Incurred losses and LAE | 1,684 | 1,389 | 3,325 | 2,790
Commission and brokerage | 672 | 579 | 1,343 | 1,135
Other underwriting expenses | 72 | 61 | 142 | 124
Underwriting gain (loss) | 303 | 335 | 649 | 540
Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross written premiums | 1,515 | 1,433 | 2,752 | 2,555
Net written premiums | 1,051 | 1,053 | 2,009 | 1,944
Premiums earned | 962 | 888 | 1,885 | 1,762
Incurred losses and LAE | 628 | 572 | 1,223 | 1,137
Commission and brokerage | 117 | 107 | 228 | 212
Other underwriting expenses | 162 | 143 | 316 | 280
Underwriting gain (loss) | $ 54 | $ 66 | $ 118 | $ 133

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