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SEGMENT REPORTING - Schedule of Underwriting Results for Operating Segments (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Segment Reporting Information [Line Items] |  |
Gross written premiums | $ 3,743 | $ 3,186
Net written premiums | 3,329 | 2,812
Premiums earned | 3,100 | 2,792
Incurred losses and LAE | 1,966 | 1,790
Commission and brokerage | 661 | 605
Other underwriting expenses | 200 | 161
Underwriting gain (loss) | 273 | 235
Net investment income | 260 | 243
Net gains (losses) on investments | 5 | (154)
Corporate expenses | (19) | (14)
Interest, fee and bond issue cost amortization expense | (32) | (24)
Other income (expense) | (79) | 15
INCOME (LOSS) BEFORE TAXES | 408 | 302
Reinsurance |  |
Segment Reporting Information [Line Items] |  |
Gross written premiums | 2,637 | 2,186
Net written premiums | 2,454 | 2,081
Premiums earned | 2,242 | 2,066
Incurred losses and LAE | 1,411 | 1,325
Commission and brokerage | 560 | 514
Other underwriting expenses | 63 | 50
Underwriting gain (loss) | 207 | 177
Insurance |  |
Segment Reporting Information [Line Items] |  |
Gross written premiums | 1,106 | 1,001
Net written premiums | 875 | 731
Premiums earned | 858 | 726
Incurred losses and LAE | 555 | 465
Commission and brokerage | 101 | 91
Other underwriting expenses | 136 | 111
Underwriting gain (loss) | $ 66 | $ 59

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