Investment Holding Level 4 Variable Interest Entities (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost	92.00%
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 0	$ 54
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	0	12
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	0	43
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure [Abstract]
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure	$ 897	$ 729
Variable Interest Entity, Commitments by Third Parties, Liquidity and Other Arrangements	427	299
Fixed Income Funds [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 0	$ 52
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	0	11
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	0	42
Partnership Interest [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	0
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	0	1
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 0	1
Partnership Interest [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets		$ 2