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Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Securities available for sale, equity securities, cost | $ 17 | $ 17
Securities held to maturity, fixed maturities, fair value | 42,816 | 45,846
Common stock, par value (in dollars per share) | $ 0.1 | $ 0.1
Common stock, shares authorized (in shares) | 1,900,000,000 | 1,900,000,000
Common stock, shares issued (in shares) | 667,620,000 | 667,046,000
Asset derivatives | 523 | 488
Liability derivatives | 358 | 837
Investments Other Than Consolidated Variable Interest Entities |  |
Securities available for sale, fixed maturities, amortized cost | 57,429 | 52,402
Securities available for sale, perpetual securities, amortized cost | 2,582 | 2,524
Securities held to maturity, fixed maturities, fair value | 42,576 | 45,610
Variable Interest Entity, Consolidated |  |
Securities available for sale, fixed maturities, amortized cost | 3,896 | 4,109
Securities available for sale, perpetual securities, amortized cost | 475 | 463
Securities held to maturity, fixed maturities, fair value | 240 | 236
Asset derivatives | 107 | 106
Liability derivatives | $ 194 | $ 207

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