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Condensed Consolidated Balance Sheets (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 fair value (amortized cost of $36,094 and $35,612) | $ 36,094 | $ 35,612
Equity securities, available-for-sale, at fair value (cost of $0 and $907) | 0 | 907
Mortgage loans (net of allowances for loan losses of $1 and $1) | $ 1 | $ 1
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 1,500,000,000 | 1,500,000,000
Common stock, $0.01 par value — 1,500,000,000 shares authorized, 384,923,222 shares issued at September 30, 2018 and December 31, 2017 | 384,923,222 | 384,923,222.00
Treasury stock, at cost — 26,247,219 and 28,088,186 shares | 26,247,219 | 28,088,186

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82921503&loc=d3e21338-158488 + Details
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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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