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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