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OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Amount Reclassified from Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net gains (losses) on investments $ (7) $ (7)
Income tax expense (benefit) (39) (99)
Other underwriting expenses (238) (224)
Net income (loss) 210 733
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 5 5
Income tax expense (benefit) (1) (1)
Net income (loss) 4 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) 0 0
Other underwriting expenses 0 1
Net income (loss) $ 0 $ 0