This excerpt taken from the C 10-Q filed Aug 7, 2009.
As a result of the closing of the private and public exchange offers and the associated exchange by the UST on a proforma basis, Citigroup increased its Tier 1 Common by approximately $64 billion from the second quarter of 2009 level of approximately $27 billion to approximately $91 billion. In addition, Citigroup's tangible common equity (TCE), which was approximately $40 billion as of June 30, 2009, increased by approximately $60 billion to approximately $100 billion on a proforma basis. (TCE and Tier 1 Common are non-GAAP financial measures. See "Capital Resources and Liquidity" below for additional information on these measures, including a reconciliation to the most directly comparable GAAP measures.)