This excerpt taken from the C 10-Q filed Oct 31, 2008.
Write-Downs on Structured Investment Vehicles (SIVs)
During the third quarter of 2008, Citigroup wrote down $2.0 billion on SIV assets, bringing the year-to-date write-downs to $2.2 billion. Citigroup increased its mezzanine financing to $4.5 billion, reflecting an increase of $1.0 billion from the original $3.5 billion financing. This additional mezzanine financing was funded subsequent to September 30, 2008. The total SIV assets as of September 30, 2008 and June 30, 2008 were approximately $27.5 billion and $34.8 billion, respectively. See "Structured Investment Vehicles" on page 74 for a further discussion.