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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense (benefit) $ 82 $ 14 $ 81 $ (97)
NET INCOME (LOSS) (319) (73) 101 948
URA(D) On Securities [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other net realized capital gains (losses) 51 (1) 73 (1)
Income tax expense (benefit) (10) (1) (12) (2)
NET INCOME (LOSS) 41 (1) 61 (3)
Benefit Plan Net Gain (Loss) [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other underwriting expenses 2 2 3 7
Income tax expense (benefit) (1) (1) (2)
NET INCOME (LOSS) $ 1 $ 2 $ 2 $ 6