SECURITIZATIONS AND VARIABLE INTEREST ENTITIES (Details 5) (USD $) In Billions, unless otherwise specified	Mar. 31, 2012 Y	Dec. 31, 2011 Y
Citibank Credit Card Master Trust (Master Trust)
Funding, Liquidity Facilities and Subordinated Interests
Weighted average maturity of term notes (in years)	3.2	3.1
Term notes issued to third parties	$ 27.0	$ 30.4
Term notes retained by Citigroup affiliates	7.4	7.7
Total Trust liabilities	34.4	38.1
Citibank OMNI Master Trust (Omni Trust)
Funding, Liquidity Facilities and Subordinated Interests
Weighted average maturity of term notes (in years)	1.3	1.5
Term notes issued to multi-seller commercial paper conduits	1.6	3.4
Term notes issued to third parties	9.2	9.2
Term notes retained by Citigroup affiliates	7.1	7.1
Total Trust liabilities	$ 17.9	$ 19.7