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Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Statement of Financial Position [Abstract] |  |
Fixed maturities, available for sale at amortized cost | $ 40,053 | $ 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 | 89,188,708 | 88,275,460

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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