With some 3,000 bank branches and consumer finance offices in the US and Canada, plus more than 2,000 additional locations in about 100 other countries, Citigroup is one of the largest financial services firms in the world. The first US bank with more than $1 trillion in assets, Citigroup offers deposits and loans (mainly through Citibank), investment banking, brokerage, wealth management, alternative investments, and other financial services. Former CEO Chuck Prince resigned in 2007 as Citigroup deals with some $60 billion in write-downs and losses on mortgage-related securities and other investments.