.0 billion of securities available for sale carried at fair value and $ 10.4 billion of securities held to maturity carried at amortized cost . comparably , at december 31 , 2011 , the carrying value of investment securities totaled $ 60.6 billion of which $ 48.6 billion represented securities available for sale carried at fair value and $ 12.0 billion of securities held to maturity carried at amortized cost . the increase in carrying amount between the periods primarily reflected an increase of $ 2