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	9 Months Ended	12 Months Ended
	Sep. 30, 2014 Contractholders	Dec. 31, 2013 Contractholders
Variable Annuity [Member] | Guaranteed Minimum Death Benefit [Member]
Guaranteed Minimum Death Benefits Coverage in Force, Contract Holders, and Underlying Mutual Fund Value [Line Items]
Death benefit coverage in force	$ 2.9	$ 3.0
Total contract holders	363,000	390,000
Aggregate value of underlying mutual fund investments for GMDB contracts	$ 13.1	$ 14.1