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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Securities held to maturity, fixed maturities, fair value |  | $ 38,599 | $ 40,021
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) |  | 672,669,000 | 671,249,000
Asset derivatives |  | $ 479 | $ 1,207
Liability derivatives |  | 974 | 1,998
Variable Interest Entity, Consolidated |  |  |
Securities available for sale, fixed maturities, amortized cost |  | 4,274 | 4,168
Securities available for sale, perpetual securities, amortized cost |  | 239 | 237
Securities available for sale, equity securities, cost |  | 595 | 972
Asset derivatives | [1] | 148 | 127
Liability derivatives | [1] | 132 | 146
Investments Other Than Consolidated Variable Interest Entities |  |  |
Securities available for sale, fixed maturities, amortized cost |  | 67,970 | 62,195
Securities available for sale, perpetual securities, amortized cost |  | 1,310 | 1,269
Securities available for sale, equity securities, cost |  | 216 | 231
Securities held to maturity, fixed maturities, fair value |  | 38,599 | 40,021
Loan Receivables and Limited Partnerships | Variable Interest Entity, Consolidated |  |  |
Other investments held in unit trust, net of reserves, amortized cost |  | $ 1,500 | $ 819
[1] | Consists entirely of derivatives

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