Reinsurance - Guaranteed Minimum Death Benefits Account Value, Net Amount at Risk and Contractholders (Details) (Variable Annuity [Member], Guaranteed Minimum Death Benefit [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Contractholders	Dec. 31, 2012 Contractholders
Variable Annuity [Member] | Guaranteed Minimum Death Benefit [Member]
Guaranteed Minimum Death Benefits Account Value Risk And Average Age Table [Line Items]
Account value	$ 14,062	$ 13,303
Net amount at risk	$ 3,023	$ 4,018
Average attained age of contractholders (weighted by exposure)	73 years	72 years
Guaranteed Minimum Death Benefits Total Contractholders	390,000	435,000