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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, 2024
Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other net realized capital gains (losses) $ (7) $ 5
Income tax expense (benefit) (99) (43)
Other underwriting expenses (224) (200)
Net income (loss) 733 365
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) 5 6
Income tax expense (benefit) (1) (3)
Net income (loss) 5 3
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 1 0
Net income (loss) $ 0 $ 0