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SEGMENT REPORTING - Schedule of Underwriting Results for Segments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]    
Gross written premiums $ 4,411 $ 3,743
Net written premiums 3,900 3,329
Premiums earned 3,652 3,100
Incurred losses and LAE 2,237 1,966
Commission and brokerage 782 661
Other underwriting expenses 224 200
Underwriting gain (loss) 409 273
Net investment income 457 260
Total net gains (losses) on investments (7) 5
Corporate expenses (22) (19)
Interest, fee and bond issue cost amortization expense (37) (32)
Other income (expense) 31 (79)
INCOME (LOSS) BEFORE TAXES 832 408
Reinsurance    
Segment Reporting Information [Line Items]    
Gross written premiums 3,175 2,620
Net written premiums 2,942 2,438
Premiums earned 2,728 2,226
Incurred losses and LAE 1,641 1,401
Commission and brokerage 671 556
Other underwriting expenses 71 63
Underwriting gain (loss) 345 205
Insurance    
Segment Reporting Information [Line Items]    
Gross written premiums 1,236 1,122
Net written premiums 958 891
Premiums earned 923 874
Incurred losses and LAE 596 565
Commission and brokerage 111 105
Other underwriting expenses 153 137
Underwriting gain (loss) $ 64 $ 67