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Fair Value of Assets and Liabilities (Details 2) - Derivatives embedded in life and annuity contracts - Equity-indexed and forward starting options - Stochastic cash flow model - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Quantitative information about the significant unobservable inputs |  |
Liabilities, fair value | $ (250) | $ (247)
Weighted average projected option cost (as a percent) | 1.74% | 1.75%
Minimum |  |
Quantitative information about the significant unobservable inputs |  |
Projected option cost (as a percent) | 1.00% | 1.00%
Maximum |  |
Quantitative information about the significant unobservable inputs |  |
Projected option cost (as a percent) | 2.20% | 2.20%

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- Definition Represents the weighted average percentage of projected option cost as an input to measure fair value. + References No definition available. + Details
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