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SEGMENT REPORTING - Schedule of Underwriting Results for Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Gross written premiums | $ 4,680 | $ 4,725 | $ 9,071 | $ 9,136
Net written premiums | 4,119 | 4,084 | 7,853 | 7,984
Premiums earned | 3,991 | 3,693 | 7,843 | 7,345
Incurred losses and LAE | 2,472 | 2,311 | 5,366 | 4,548
Commission and brokerage | 880 | 790 | 1,704 | 1,571
Other underwriting expenses | 254 | 234 | 492 | 458
Underwriting gain (loss) | 385 | 358 | 281 | 767
Net investment income | 532 | 528 | 1,023 | 985
Net gains (losses) on investments | (5) | (17) | (12) | (24)
Corporate expenses | (31) | (22) | (52) | (44)
Interest, fee and bond issue cost amortization expense | (38) | (37) | (76) | (75)
Other income (expense) | (27) | 23 | (100) | 54
INCOME (LOSS) BEFORE TAXES | 815 | 832 | 1,064 | 1,664
Reinsurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross written premiums | 3,243 | 3,209 | 6,463 | 6,385
Net written premiums | 3,077 | 3,033 | 5,888 | 5,975
Premiums earned | 3,037 | 2,731 | 5,942 | 5,459
Incurred losses and LAE | 1,772 | 1,684 | 3,995 | 3,324
Commission and brokerage | 753 | 672 | 1,460 | 1,343
Other underwriting expenses | 76 | 72 | 147 | 142
Underwriting gain (loss) | 436 | 303 | 340 | 650
Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross written premiums | 1,414 | 1,459 | 2,559 | 2,618
Net written premiums | 1,022 | 1,009 | 1,919 | 1,905
Premiums earned | 920 | 910 | 1,833 | 1,781
Incurred losses and LAE | 643 | 588 | 1,284 | 1,139
Commission and brokerage | 121 | 111 | 233 | 215
Other underwriting expenses | 174 | 154 | 339 | 300
Underwriting gain (loss) | (18) | 56 | (23) | 127
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross written premiums | 22 | 57 | 50 | 133
Net written premiums | 20 | 42 | 47 | 103
Premiums earned | 35 | 52 | 67 | 104
Incurred losses and LAE | 58 | 39 | 87 | 85
Commission and brokerage | 7 | 7 | 11 | 13
Other underwriting expenses | 3 | 8 | 6 | 16
Underwriting gain (loss) | $ (33) | $ (2) | $ (36) | $ (10)

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