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Investments (Details 7) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014
Fixed maturities [Member] |  |
Gross realized gains and losses on the sale of available for sale fixed maturity and equity security investments |  |
Gross gains | $ 13 | $ 18
Gross losses | 0 | (2)
Equity securities [Member] |  |
Gross realized gains and losses on the sale of available for sale fixed maturity and equity security investments |  |
Gross gains | 46 | 12
Gross losses | $ 0 | $ 0

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