Investments (Schedule Of Average Carrying Value Of Impaired Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Information about impaired mortgage loans on real estate
Average carrying value for impaired mortgage loans on real estate	$ 3
Interest income recognized on impaired mortgage loans on real estate
Interest income collected on impaired mortgage loans on real estate