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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Statement of Financial Position [Abstract] |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $35,894 and $35,603) | $ 35,894 | $ 35,603
Mortgage loans (net of allowances for loan losses of $1 and $1) | $ 1 | $ 1
Preferred stock, 13,800 shares issued | 13,800,000 | 13,800,000
Preferred stock, par value | $ 0.01 | $ 0.01
Preferred stock, shares authorized | 50,000,000 | 50,000,000
Preferred stock aggregate liquidation preference | $ 345 | $ 345
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 1,500,000,000 | 1,500,000,000
Common stock 384,923,222 shares issued at March 31, 2019 and December 31, 2018 | 384,923,222.00 | 384,923,222.00
Treasury stock, at cost — 24,058,244 and 25,772,238 shares | 24,058,244 | 25,772,238

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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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