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OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Amount Reclassified from Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gains (losses) on investments $ (27) $ (31) $ (50) $ (21)
Income tax expense (benefit) 68 47 275 169
Other underwriting expenses (236) (215) (694) (620)
Net income (loss) 509 678 1,966 1,713
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 33 17 49 26
Income tax expense (benefit) (3) (2) (6) (6)
Net income (loss) 30 15 44 21
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 (6) 0
Other underwriting expenses 1 (1) 31 2
Net income (loss) $ 0 $ 0 $ 24 $ 1