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OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Amount Reclassified from Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other net realized capital gains (losses) $ (17) $ 5 $ (24) $ 10
Income tax expense (benefit) 108 80 207 122
Other underwriting expenses (234) (205) (458) (405)
Net income (loss) 724 670 1,457 1,035
URA(D) on securities | Reclassification From Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other net realized capital gains (losses) 11 4 17 10
Income tax expense (benefit) (2) (2) (3) (4)
Net income (loss) 9 2 14 5
Benefit plan net gain (loss) | Reclassification From Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense (benefit) (6) 0 (7) 0
Other underwriting expenses (31) (1) 31 1
Net income (loss) $ 24 $ 1 $ 25 $ 1