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OTHER COMPREHENSIVE INCOME (LOSS) - Reclassification from Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other net realized capital gains (losses) $ 5 $ (154)
Other underwriting expenses 200 161
Income tax expense (benefit) 43 4
Net income (loss) 365 298
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) 6 5
Income tax expense (benefit) (3) (1)
Net income (loss) 3 4
Benefit plan net gain (loss) | Reclassification From Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other underwriting expenses 0 1
Income tax expense (benefit) 0 0
Net income (loss) $ 0 $ 1