Commitments, Guarantees and Contingencies Loss Contingencies (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Minimum interest rate guarantees in fixed accounts	5.00%
Insurance-related Assessments [Member]
Loss Contingencies [Line Items]
Loss contingency for guaranty fund assessments	$ 13	$ 14
Loss contingency for guaranty fund assessments premium tax asset offset	12
Otkritie Capital International LTD and JSC Otkririe Holding v. Threadneedle Asset Management LTD. and Threadneedle Management Services Ltd. [Member]
Loss Contingencies [Line Items]
Loss contingency for damages sought by plantiff	$ 120