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Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Statement of Financial Position [Abstract] |  |
Fixed maturities, available for sale at amortized cost | $ 37,038 | $ 33,735
Equity securities, available for sale at cost | $ 1,321 | $ 1,351
Common Stock, par value (USD per share) | $ 0 | $ 0
Common Stock, shares authorized | 200,000,000 | 200,000,000
Common Stock, shares outstanding | 88,275,460 | 86,924,399

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