Variable Annuity and Insurance Guarantees (IUL Secondary Guarantees) (Details) - UL secondary guarantees [Member] - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Insurance Guarantees by Benefit Type
Net amount at risk	$ 6,413	$ 6,076
Weighted average attained age	63 years	62 years