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Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Securities available for sale, equity securities, cost | $ 18 | $ 20
Securities held to maturity, fixed maturities, fair value | 47,047 | 54,841
Common stock, par value | $ 0.1 | $ 0.1
Common stock, shares authorized | 1,900,000,000 | 1,900,000,000
Common stock, shares issued | 665,778,000 | 665,239,000
Asset derivatives | 430 | 345
Investments Other Than Consolidated Variable Interest Entities |  |
Securities available for sale, fixed maturities, amortized cost | 48,058 | 48,355
Securities available for sale, perpetual securities, amortized cost | 3,113 | 3,654
Securities held to maturity, fixed maturities, fair value | 46,788 | 54,554
Variable Interest Entity, Consolidated |  |
Securities available for sale, fixed maturities, amortized cost | 4,721 | 5,058
Securities available for sale, perpetual securities, amortized cost | 520 | 559
Securities held to maturity, fixed maturities, fair value | 259 | 287
Asset derivatives | 158 | 191
Liability derivatives | $ 371 | $ 399

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