Reinsurance - Guaranteed Minimum Death Benefits Account Value, Net Amount at Risk and Contractholders (Details) (Variable Annuity [Member], Guaranteed Minimum Death Benefit [Member], USD $) In Billions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014 Contractholders	Dec. 31, 2013 Contractholders
Variable Annuity [Member] | Guaranteed Minimum Death Benefit [Member]
Guaranteed Minimum Death Benefits Account Value Risk And Average Age Table [Line Items]
Account value	$ 13.8	$ 14.1
Net amount at risk	$ 2.9	$ 3.0
Guaranteed Minimum Death Benefits Total Contractholders	382,000	390,000