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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Securities held to maturity, fixed maturities, fair value | $ 47,937 | $ 37,520
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) | 670,984,000 | 669,723,000
Asset derivatives | $ 1,662 | $ 676
Liability derivatives | 601 | 371
Investments Other Than Consolidated Variable Interest Entities |  |
Securities available for sale, fixed maturities, amortized cost | 66,059 | 56,903
Securities available for sale, perpetual securities, amortized cost | 1,677 | 1,586
Securities available for sale, equity securities, cost | 233 | 117
Securities held to maturity, fixed maturities, fair value | 47,937 | 37,520
Variable Interest Entity, Consolidated |  |
Securities available for sale, fixed maturities, amortized cost | 4,870 | 3,739
Securities available for sale, perpetual securities, amortized cost | 273 | 255
Securities available for sale, equity securities, cost | 1,036 | 363
Asset derivatives | 168 | 102
Liability derivatives | $ 124 | $ 293

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