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OTHER COMPREHENSIVE INCOME (LOSS) - Reclassification from Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other net realized capital gains (losses) $ (31) $ (129) $ (21) $ (519)
Other underwriting expenses 215 169 620 500
Income tax expense (benefit) 47 (82) 169 (81)
Net income (loss) 678 (319) 1,713 101
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) 17 51 26 73
Income tax expense (benefit) (2) (10) (6) (12)
Net income (loss) 15 41 21 61
Benefit plan net gain (loss) | Reclassification From Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other underwriting expenses 1 2 2 3
Income tax expense (benefit) 0 (1) 0 (1)
Net income (loss) $ 0 $ 1 $ 1 $ 2