Investments (Changes In The Valuation Allowance Of Impaired Mortgage Loans On Real Estate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Losses
Balance as of beginning-of-year	$ 3	$ 3	$ 21
Additions			3
Charge-offs, net of recoveries	$ (1)		(21)
Balance as of end-of-period	$ 2	$ 3	$ 3