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Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Securities available for sale, Equity securities, cost | $ 21 | $ 22
Securities held to maturity, fixed maturities, fair value | 48,444 | 46,383
Common stock, par value | $ 0.1 | $ 0.1
Common stock, shares authorized | 1,900,000,000 | 1,900,000,000
Common stock, shares issued | 664,437,000 | 663,639,000
Investments other than Consolidated Variable Interest Entities |  |
Securities available for sale, Fixed maturities, amortized cost | 39,423 | 40,534
Securities available for sale, Perpetual securities, amortized cost | 4,299 | 5,365
Securities held to maturity, fixed maturities, fair value | 47,943 | 45,817
Variable Interest Entity, Consolidated |  |
Securities available for sale, Fixed maturities, amortized cost | 4,714 | 4,822
Securities available for sale, Perpetual securities, amortized cost | 1,223 | 1,532
Securities held to maturity, fixed maturities, fair value | 501 | 566
Asset Derivatives | 271 | 375
Liability Derivatives | $ 419 | $ 531

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