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Debt Securities (Schedule Of Gross Gains And Gross Losses On Available For Sale Securities) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Investments, Debt and Equity Securities [Abstract]  
Gross realized gains $ 16
Gross realized losses (43)
Other than Temporary Impairment (1)
Available-for-sale Securities, Gross Realized Gain (Loss) $ (28)