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Investments and Derivative Instruments Level 4 Derivative Collateral Arrangements (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2015
Derivative Collateral Arrangements [Line Items] |  |
Fair Value, Concentration of Risk, Investments | $ 0 | $ 0
Security Owned and Pledged as Collateral, Fair Value | 120,000,000 | 488,000,000
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 327,000,000 | 369,000,000
Derivative, Collateral, Obligation to Return Securities | 109,000,000 | 100,000,000
Fair Value of Securities Received as Collateral that Can be Resold or Repledged | 97,000,000 | 100,000,000
Securities Received as Collateral, Amount Repledged and Sold | 0 |
Fixed Maturities [Member] |  |
Derivative Collateral Arrangements [Line Items] |  |
Security Owned and Pledged as Collateral, Fair Value | $ 1,100,000,000 | $ 1,100,000,000
J.P. Morgan Chase [Member] | Corporate Debt Securities [Member] |  |
Derivative Collateral Arrangements [Line Items] |  |
Largest Exposure by Issuer, Percent of Invested Assets |  | 1.00%
GOLDMAN SACH MTF [Member] | Corporate Debt Securities [Member] |  |
Derivative Collateral Arrangements [Line Items] |  |
Largest Exposure by Issuer, Percent of Invested Assets |  | 1.00%
ILLINOIS | US States and Political Subdivisions Debt Securities [Member] |  |
Derivative Collateral Arrangements [Line Items] |  |
Largest Exposure by Issuer, Percent of Invested Assets | 1.00% |
US Treasury Securities [Member] |  |
Derivative Collateral Arrangements [Line Items] |  |
Available-for-sale Securities Pledged as Collateral | $ 34,000,000 | $ 35,000,000

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