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OTHER COMPREHENSIVE INCOME (LOSS) - Reclassification from Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other net realized capital gains (losses) $ 5 $ (236) $ 10 $ (390)
Other underwriting expenses 205 170 405 331
Income tax expense (benefit) 80 (4) 122 1
Net income (loss) 670 123 1,035 420
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) 4 16 10 21
Income tax expense (benefit) (2) (1) (4) (1)
Net income (loss) 2 16 5 20
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 1 1 2
Income tax expense (benefit) 0 0 0 0
Net income (loss) $ 0 $ 1 $ 1 $ 2