Investments (Average Carrying Value On The Impaired Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Information about impaired mortgage loans on real estate
Average carrying value for impaired loans on real estate	$ 6	$ 23	$ 6	$ 23
Interest income recognized on impaired mortgage loans on real estate				1
Interest income collected on impaired mortgage loans on real estate				$ 1