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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gains (losses) on investments $ (5) $ (17) $ (12) $ (24)
Income tax expense (benefit) (135) (108) (173) (207)
Other underwriting expenses (254) (234) (492) (458)
Net income (loss) 680 724 890 1,457
URA(D) of securities | Reclassification From Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gains (losses) on investments 10 11 15 17
Income tax expense (benefit) (3) (2) (3) (3)
Net income (loss) 7 9 12 14
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) 2 (6) 2 (7)
Other underwriting expenses (10) 31 (10) 31
Net income (loss) $ (8) $ 24 $ (8) $ 25