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Investments (Details 7) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Fixed maturities [Member] |  |
Gross realized gains and losses on the sale of available for sale fixed maturity and equity security investments |  |
Gross gains | $ 14 | $ 5
Gross losses | (1) | 0
Equity securities [Member] |  |
Gross realized gains and losses on the sale of available for sale fixed maturity and equity security investments |  |
Gross gains | 25 | 21
Gross losses | $ 0 | $ 0

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