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Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
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Statement of Financial Position [Abstract] |  |
Fixed maturities, available for sale at amortized cost | $ 31,868 | $ 29,074
Equity securities, available for sale at cost | $ 1,590 | $ 1,283
Common Stock, par value (USD per share) | $ 0 | $ 0
Common Stock, shares authorized | 200,000,000 | 200,000,000
Common Stock, shares outstanding | 87,327,172 | 87,708,793

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