Investments (Schedule Of Average Carrying Value Of Impaired Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Commercial [Member]
Information about impaired mortgage loans on real estate
Average carrying value for impaired mortgage loans on real estate	$ 31	$ 31	$ 33	$ 17