Investments and Derivative Instruments Level 4 Variable Interest Entities (Details) - USD ($) $ in Millions		6 Months Ended		12 Months Ended
		Jun. 30, 2016		Dec. 31, 2015
Variable Interest Entity [Line Items]
Commitments to Fund Limited Partnership and Other Alternative Investments		$ 0
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure		1,000		$ 729
Variable Interest Entity, Consolidated, Carrying Amount, Assets		7		54
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	[1]	0		12
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[2]	$ 7		$ 43
Variable Interest Entity, Commitments by Third Parties, Liquidity and Other Arrangements		392		299
Fixed Income Funds [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	[3]	$ 0		$ 52
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	[1]	0		11
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[2]	0		42
Partnership Interest [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	[4]	7
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities		0	[1]	1
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[2]	7		1
Partnership Interest [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	[4]			2
Other Liabilities [Member]
Variable Interest Entity [Line Items]
Assets Sold under Agreements to Repurchase, Repurchase Liability		231		249
Fixed Maturities [Member]
Variable Interest Entity [Line Items]
Available-for-sale Securities Pledged as Collateral		$ 233		$ 249

[1] Included in other liabilities on the Company’s Condensed Consolidated Balance Sheets.

[2] The maximum exposure to loss represents the maximum loss amount that the Company could recognize as a reduction in net investment income or as a realized capital loss and is the cost basis of the Company’s investment.

[3] Total assets included in fixed maturities, FVO, short-term investments, and equity, AFS on the Company’s Condensed Consolidated Balance Sheets.

[4] [4]Total assets included in limited partnerships and other alternative investments, short-term investments, and other assets on the Company’s Condensed Consolidated Balance Sheets.