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Investments (Major Categories Of Net Investment Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investment Income [Line Items]      
Investment income (loss) $ 1,034 $ 1,011 $ 908
Investment expense (29) (41) (41)
Net investment income 1,005 970 867
Fixed Maturity Securities [Member]      
Investment Income [Line Items]      
Investment income (loss) 721 681 614
Equity Securities [Member]      
Investment Income [Line Items]      
Investment income (loss) 100 86 116
Cash Equivalents [Member]      
Investment Income [Line Items]      
Investment income (loss) 64 51 25
Other Investments [Member]      
Investment Income [Line Items]      
Investment income (loss) $ 149 $ 193 $ 153