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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Securities available for sale, equity securities, cost $ 20 $ 22
Securities held to maturity, fixed maturities, fair value 54,841 46,383
Common stock, par value (in dollars per share) $ 0.1 $ 0.1
Common stock, shares authorized (in shares) 1,900,000 1,900,000
Common stock, shares issued (in shares) 665,239 663,639
Investments Other Than Consolidated Variable Interest Entities
   
Securities available for sale, fixed maturities, amortized cost 48,355 40,534
Securities available for sale, perpetual securities, amortized cost 3,654 5,365
Securities held to maturity, fixed maturities, fair value 54,554 45,817
Variable Interest Entity, Consolidated
   
Securities available for sale, fixed maturities, amortized cost 5,058 4,822
Securities available for sale, perpetual securities, amortized cost 559 1,532
Securities held to maturity, fixed maturities, fair value 287 566
Asset derivatives 399 375
Liability derivatives $ 191 $ 531