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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Securities available for sale, equity securities, cost $ 18 $ 20
Securities held to maturity, fixed maturities, fair value 47,047 54,841
Common stock, par value $ 0.1 $ 0.1
Common stock, shares authorized 1,900,000,000 1,900,000,000
Common stock, shares issued 665,778,000 665,239,000
Asset derivatives 430 345
Investments Other Than Consolidated Variable Interest Entities
   
Securities available for sale, fixed maturities, amortized cost 48,058 48,355
Securities available for sale, perpetual securities, amortized cost 3,113 3,654
Securities held to maturity, fixed maturities, fair value 46,788 54,554
Variable Interest Entity, Consolidated
   
Securities available for sale, fixed maturities, amortized cost 4,721 5,058
Securities available for sale, perpetual securities, amortized cost 520 559
Securities held to maturity, fixed maturities, fair value 259 287
Asset derivatives 158 191
Liability derivatives $ 371 $ 399