Fair Value Measurements Level 4 Credit Standing Adjustments and Behavior Risk Margin (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities	$ (1)		$ (1)		$ 0
Behavior Risk Margin	42		42		$ 45
Credit standing adjustment assumption net of reinsurance [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	$ 0	(1)	$ (1)
Gain (Loss) Due to Changes in Assumptions [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0		0
Behavior Risk Margin Update Due to Underlying Fund Performance [Member] | GMWB Derivatives, Net [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 11	$ (21)	$ 24	$ (10)