Investments and Derivative Instruments Level 4 Variable Interest Entities (Details) - USD ($)		6 Months Ended	12 Months Ended
		Jun. 30, 2016	Dec. 31, 2015
Variable Interest Entities [Line Items]
Commitments to Fund Limited Partnership and Other Alternative Investments		$ 20,000,000
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure		$ 1,800,000,000	$ 1,500,000,000
Variable Interest Entity, Commitments by Third Parties, Liquidity and Other Arrangements		1.1	692
Consolidated Variable Interest Entities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets		$ 12,000,000	$ 166,000,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[1]	7,000,000	153,000,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Consolidated Variable Interest Entities [Abstract]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount		3,000,000	3,000,000
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets		4,000,000	7,000,000
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities		6,000,000	8,000,000
Partnership Interest [Member]
Consolidated Variable Interest Entities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	[2]	7,000,000
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	[3]	0	0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[1]	7,000,000	2,000,000
Collateralized Debt Obligations [Member]
Consolidated Variable Interest Entities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	[4]	5,000,000	5,000,000
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	[3],[4]	5,000,000	5,000,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[1],[4]	0	0
Fixed Income Funds [Member]
Consolidated Variable Interest Entities [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	[5]	0	159,000,000
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	[3],[5]	0	7,000,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[1],[5]	0	$ 151,000,000
Unfunded Loan Commitment [Member]
Variable Interest Entities [Line Items]
Commitments to Fund Limited Partnership and Other Alternative Investments		$ 0

[1] 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.

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

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

[4] Total assets included in cash on the Company’s Condensed Consolidated Balance Sheets.

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