Investments (Schedule Of Impaired Mortgage Loans) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013 item	Jun. 30, 2012	Jun. 30, 2013 item	Jun. 30, 2012	Dec. 31, 2012 item	Dec. 31, 2011
Information about impaired mortgage loans on real estate
Number of impaired mortgage loans on real estate	5		5		10
Principal balance of impaired mortgage loans on real estate	$ 41		$ 41		$ 75
Valuation allowance associated with impaired mortgage loans on real estate	(8)		(8)		(21)	(31)
Carrying value of impaired mortgage loans on real estate	33		33		54
Average carrying value for impaired loans on real estate	35	49	41	56
Interest income recognized on impaired mortgage loans on real estate			1
Interest income collected on impaired mortgage loans on real estate			$ 1