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Investment Holding Level 4 Variable Interest Entities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure | $ 1,700 | $ 1,500 |
Variable Interest Entity, Commitments by Third Parties, Liquidity and Other Arrangements | 1.2 | 692 |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | $ 5 | $ 166 |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 0 | 153 |
Secured Debt, Repurchase Agreements | 0 | 0 |
Securities Reserve Deposit Required and Made | 2,500 | 2,500 |
Securities Loaned | 488 | 67 |
Securities Held as Collateral, at Fair Value | 461 | 0 |
Securities Received as Collateral | 0 |  |
Equity Method Investments | 2,100 |  |
Outstanding Commitments to Fund Limited Partnership and Other Alternative Investments | $ 1,200 |  |
Aggregate Investment Loss Percentage of Company's Pre Tax Consolidated Net Income Minimum | 10.00% |  |
Assets | $ 223,432 | 228,348 |
Liabilities | 206,529 | 210,706 |
Net Investment Income | 2,961 | 3,030 | $ 3,154
Net Income (Loss) Attributable to Parent | 896 | 1,682 | 798
Collateralized Debt Obligations [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 5 | 5 |
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities | 5 | 5 |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 0 | 0 |
Fixed Income Funds [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 0 | 159 |
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities | 0 | 7 |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 0 | 151 |
Partnership Interest [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 0 | 2 |
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities | 0 | 0 |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 0 | 2 |
Other Liabilities [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities | 5 | 12 |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets | 1 | 7 |
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities | 3 | 8 |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 3 | 3 |
Fixed Maturities [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Available-for-sale Securities Pledged as Collateral | 226 | 440 |
Other Liabilities [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Assets Sold under Agreements to Repurchase, Repurchase Liability | 241 | 445 |
Cash [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Available-for-sale Securities Pledged as Collateral | 22 | 5 |
US Treasury Securities [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Available-for-sale Securities Pledged as Collateral | 102 | 35 |
Limited Partner [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Assets | 114,400 | 95,500 |
Liabilities | 19,100 | 15,200 |
Net Investment Income | 1,000 | 1,000 | 3,600
Net Income (Loss) Attributable to Parent | $ 8,000 | $ 6,300 | $ 9,600

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