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Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
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Statement of Financial Position [Abstract] |  |
Fixed maturities, available for sale at amortized cost | $ 32,749 | $ 31,565
Equity securities, available for sale at cost | $ 1,475 | $ 1,469
Common Stock, par value (USD per share) | $ 0 | $ 0
Common Stock, shares authorized | 200,000,000 | 200,000,000
Common Stock, shares outstanding | 86,966,290 | 87,474,452

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