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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale securities, at fair value: |  |
Fixed maturity securities (amortized cost) | $ 86,593 | $ 84,287
Variable interest entities' fixed maturity securities (amortized cost) | 0 | 200
Equity securities (cost) | $ 296 | $ 260
Stockholders' Equity |  |
Preferred stock - shares authorized (in shares) | 10,000,000 | 10,000,000
Common stock - shares authorized (in shares) | 800,000,000 | 800,000,000
Common stock - shares issued (in shares) | 219,544,618 | 226,335,105
Common stock - shares outstanding (in shares) | 219,544,618 | 226,335,105

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