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SEGMENT REPORTING - Schedule of Underwriting Results for Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Segment Reporting Information [Line Items]        
Gross written premiums $ 4,725 $ 4,180 $ 9,136 $ 7,923
Net written premiums 4,084 3,674 7,984 7,003
Premiums earned 3,693 3,251 7,345 6,352
Incurred losses and LAE 2,311 1,960 4,548 3,927
Commission and brokerage 790 686 1,571 1,347
Other underwriting expenses 234 205 458 405
Underwriting gain (loss) 358 401 767 673
Net investment income 528 357 985 617
Net gains (losses) on investments (17) 5 (24) 10
Corporate expenses (22) (17) (44) (36)
Interest, fee and bond issue cost amortization expense (37) (33) (75) (65)
Other income (expense) 23 38 54 (42)
INCOME (LOSS) BEFORE TAXES 832 750 1,664 1,157
Reinsurance        
Segment Reporting Information [Line Items]        
Gross written premiums 3,209 2,747 6,385 5,368
Net written premiums 3,033 2,621 5,975 5,059
Premiums earned 2,731 2,364 5,459 4,590
Incurred losses and LAE 1,684 1,389 3,325 2,790
Commission and brokerage 672 579 1,343 1,135
Other underwriting expenses 72 61 142 124
Underwriting gain (loss) 303 335 649 540
Insurance        
Segment Reporting Information [Line Items]        
Gross written premiums 1,515 1,433 2,752 2,555
Net written premiums 1,051 1,053 2,009 1,944
Premiums earned 962 888 1,885 1,762
Incurred losses and LAE 628 572 1,223 1,137
Commission and brokerage 117 107 228 212
Other underwriting expenses 162 143 316 280
Underwriting gain (loss) $ 54 $ 66 $ 118 $ 133