Investments (Changes In The Valuation Allowance Of Impaired Mortgage Loans On Real Estate (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Allowance for Losses
Balance as of beginning-of-year	$ 2	$ 3	$ 2	$ 3
Additions	1		1
Charge-offs, net of recoveries		(1)		(1)
Balance as of end-of-period	$ 3	$ 2	$ 3	$ 2