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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net realized capital gains (losses) $ (276) $ (455) $ 258
Income tax expense (benefit) 363 9 (167)
Other underwriting expenses (846) (682) (583)
Net income (loss) 2,517 597 $ 1,379
URA(D) on securities | Reclassification from Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net realized capital gains (losses) 285 107  
Income tax expense (benefit) (41) (18)  
Net income (loss) 244 89  
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 (1)  
Other underwriting expenses 2 3  
Net income (loss) $ 2 $ 2