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GOODWILL AND INTANGIBLE ASSETS (Details 2) (USD $)
In Millions
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Goodwill:    
Goodwill$ 25,496$ 26,621$ 26,339$ 26,152
North America Regional Consumer Banking
    
Goodwill:    
Goodwill2,545   
EMEA Regional Consumer Banking
    
Goodwill:    
Goodwill357   
Asia Regional Consumer Banking
    
Goodwill:    
Goodwill5,667   
Latin America Regional Consumer Banking
    
Goodwill:    
Goodwill1,730   
Securities and Banking
    
Goodwill:    
Goodwill9,185   
Global Transaction Services
    
Goodwill:    
Goodwill1,550   
Brokerage and Asset Management.
    
Goodwill:    
Goodwill71   
Local Consumer Lending-Cards
    
Goodwill:    
Goodwill4,391   
Regional Consumer Banking
    
Goodwill:    
Goodwill10,299   
Institutional Clients Group
    
Goodwill:    
Goodwill10,735   
Citi Holdings
    
Goodwill:    
Goodwill$ 4,462