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OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Amount Reclassified from Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net realized capital gains (losses) $ 19 $ (276) $ (455)
Income tax expense (benefit) (120) 363 9
Other underwriting expenses (938) (846) (682)
Net income (loss) 1,373 2,517 $ 597
URA(D) of securities | Reclassification from Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net realized capital gains (losses) (18) 285  
Income tax expense (benefit) 6 (41)  
Net income (loss) (12) 244  
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 (2) 2  
Net income (loss) $ (1) $ 2