This excerpt taken from the C 8-K filed Oct 13, 2009.
Trading account assets include debt and marketable equity securities, derivatives in a receivable position, residual interests in securitizations and physical commodities inventory. In addition (as set out in Note 27 to the Consolidated Financial Statements), certain assets that Citigroup has elected to carry at fair value under SFAS 159, such as loans and purchased guarantees, are also included in Trading account assets.
This excerpt taken from the C 10-K filed Feb 28, 2005.
Trading Account Assets
At December 31, 2004, the balance was $280.2 billion, an increase of $44.8 billion or 19% from the prior year. The increase was attributable to portfolio growth of $32.8 billion in equity securities, $7.4 billion in corporate and other debt securities, $6.9 billion in mortgage loans and collateralized mortgage securities (CMS), $5.8 billion in other (primarily gold and silver contracts), $5.3 billion in foreign government securities, and $4.7 billion in state and municipal securities, partially offset by decreases of $20.3 billion in U.S. Treasury securities. Additionally, there was a $2.2 billion increase in revaluation gains (primarily interest rate and FX contracts). See Note 8 to the Consolidated Financial Statements.