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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)