Guaranteed Benefit Features (Information On Guaranteed Death Benefit Features) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2013		Dec. 31, 2012
Return of Net Deposits [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Total Account Value	$ 74,277		$ 63,478
Net Amount At Risk By Product and Guarantee Sep Acct Value	200	[1]	392	[1]
Average attained age of contract holders	61 years		60 years
Minimum Return [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Total Account Value	149		149
Net Amount At Risk By Product and Guarantee Sep Acct Value	30	[1]	37	[1]
Average attained age of contract holders	73 years		73 years
Guaranteed minimum return	5.00%		5.00%
Anniversary Contract Value [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Total Account Value	24,719		23,019
Net Amount At Risk By Product and Guarantee Sep Acct Value	$ 649	[1]	$ 1,133	[1]
Average attained age of contract holders	68 years		67 years

[1] Represents the amount of death benefit in excess of the account balance.  The decrease in net amount at risk when comparing September 30, 2013, to December 31, 2012, was attributable primarily to the increase in the equity markets during the first nine months of 2013.