The following table provides a summary of fixed maturity and equity securities investments Summary of Fixed Maturity and Equity Securities Gross Unrealized Losses Cost or Gross Less than Greater than December 31, 2011 in millions) Amortized Cost Unrealized Gains 12 Months 12 Months Estimated Fair Value Fixed maturity Securities available for sale U.S. Treasury securities and obligations of government agencies 5594 $ 687 Asset backed securities 11,776 11,409 States, municipalities and politicalsubdivisions tax exempt securities 7,615 7,675 8,867 Other debt securities 4143 Redeemable preferred stock 1,216 Total foxed maturity securities vailable for sale 34,080 Total fixed maturity Securities trading Equity Securities available for sale Common Stock Preferred stock Total equity securities available for sale Total $ 34,756 8.952 4.299 1,058 246 482 (a) At what amount does CNA report its investment portfolio on its balance sheet? in your answer identify the portfolio's fair value, cost, and any unrealized gains and losses. Reported on balance sheet - Fair value Cost Unrealized gans Unrealized losses (b) Compute the net unrealized gain or loss on CNA's investment portfolio. Use a negative sign with your answer to indicate an unrealized loss. $0 x million