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Investments and Derivative Instruments Level 4 Derivative Collateral Arrangements (Details) - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Derivative Collateral Arrangements [Line Items]      
Security Owned and Pledged as Collateral, Fair Value $ 130,000,000   $ 120,000,000
Fair Value of Securities Received as Collateral that Can be Resold or Repledged 85,000,000   97,000,000
Securities Received as Collateral, Amount Repledged and Sold 0 $ 0  
Derivative Asset, Collateral, Obligation to Return Cash, Offset 338,000,000   327,000,000
Derivative, Collateral, Obligation to Return Securities 86,000,000   109,000,000
Fixed Maturities [Member]      
Derivative Collateral Arrangements [Line Items]      
Security Owned and Pledged as Collateral, Fair Value $ 1,200,000,000   $ 1,100,000,000