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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Securities available for sale, Equity securities, cost $ 22 $ 22
Common stock, par value $ 0.10 $ 0.10
Common stock, shares authorized 1,900,000,000 1,900,000,000
Common stock, shares issued 663,639,000 662,660,000
Securities held to maturity, fixed maturities, fair value 46,383 30,469
Investments other than Consolidated Variable Interest Entities
   
Securities available for sale, Fixed maturities, amortized cost 40,534 43,133
Securities available for sale, Perpetual securities, amortized cost 5,365 6,209
Securities held to maturity, fixed maturities, fair value 45,817 29,899
Variable Interest Entity, Consolidated
   
Securities available for sale, Fixed maturities, amortized cost 4,822 4,969
Securities available for sale, Perpetual securities, amortized cost 1,532 1,618
Securities held to maturity, fixed maturities, fair value 566 570
Derivatives from consolidated VIEs, assets 375 564
Derivatives from consolidated VIEs, liabilities $ 531 $ 741