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Investments (Schedule Of Average Carrying Value Of Impaired Mortgage Loans On Real Estate) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Information about impaired mortgage loans on real estate      
Average carrying value for impaired mortgage loans on real estate $ 21 $ 5
Interest income recognized on impaired mortgage loans on real estate   1
Interest income collected on impaired mortgage loans on real estate   $ 1