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SEGMENT REPORTING - Schedule of Underwriting Results for Operating Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Segment Reporting Information [Line Items] |  |  |  |
Gross written premiums | $ 4,180 | $ 3,447 | $ 7,923 | $ 6,633
Net written premiums | 3,674 | 3,021 | 7,003 | 5,833
Premiums earned | 3,251 | 2,916 | 6,352 | 5,708
Incurred losses and LAE | 1,960 | 1,876 | 3,927 | 3,666
Commission and brokerage | 686 | 630 | 1,347 | 1,236
Other underwriting expenses | 205 | 170 | 405 | 331
Underwriting gain (loss) | 401 | 240 | 673 | 476
Net investment income | 357 | 226 | 617 | 469
Total net gains (losses) on investments | 5 | (236) | 10 | (390)
Corporate expenses | (17) | (15) | (36) | (29)
Interest, fee and bond issue cost amortization expense | (33) | (24) | (65) | (48)
Other income (expense) | 38 | (71) | (42) | (56)
INCOME (LOSS) BEFORE TAXES | 750 | 119 | 1,157 | 421
Reinsurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross written premiums | 2,766 | 2,201 | 5,403 | 4,387
Net written premiums | 2,639 | 2,122 | 5,093 | 4,204
Premiums earned | 2,382 | 2,140 | 4,624 | 4,206
Incurred losses and LAE | 1,400 | 1,382 | 2,811 | 2,707
Commission and brokerage | 583 | 531 | 1,143 | 1,045
Other underwriting expenses | 62 | 52 | 125 | 103
Underwriting gain (loss) | 337 | 175 | 544 | 351
Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross written premiums | 1,414 | 1,246 | 2,520 | 2,247
Net written premiums | 1,035 | 899 | 1,910 | 1,630
Premiums earned | 869 | 777 | 1,728 | 1,502
Incurred losses and LAE | 560 | 494 | 1,115 | 959
Commission and brokerage | 103 | 99 | 204 | 190
Other underwriting expenses | 143 | 117 | 280 | 228
Underwriting gain (loss) | $ 64 | $ 66 | $ 129 | $ 124

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