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Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Statement of Financial Position [Abstract] |  |
Fixed maturities, available for sale at amortized cost | $ 39,244 | $ 37,038
Common Stock, par value (USD per share) | $ 0 | $ 0
Common Stock, shares authorized | 200,000,000 | 200,000,000
Common Stock, shares outstanding | 89,072,114 | 88,275,460

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