Investments (Schedule Of Average Carrying Value Of Impaired Mortgage Loans On Real Estate) (Details) - Commercial [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Information about impaired mortgage loans on real estate
Average carrying value for impaired commercial mortgage loans on real estate		$ 8
Interest income recognized on impaired commercial mortgage loans on real estate
Interest income collected on impaired commercial mortgage loans on real estate