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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