SECURITIZATIONS AND VARIABLE INTEREST ENTITIES (Details 4) (USD $) In Billions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Citicorp
Securitized credit card receivables
Principal amount of credit card receivables in trusts	$ 82.4	$ 89.8
Ownership interests in principal amount of trust credit card receivables
Sold to investors via trust-issued securities	37.6	42.7
Retained by Citigroup as trust-issued securities	14.4	14.7
Retained by Citigroup via non-certificated interests	30.4	32.4
Total ownership interests in principal amount of trust credit card receivables	82.4	89.8
Citi Holdings
Securitized credit card receivables
Principal amount of credit card receivables in trusts	0.5	0.6
Ownership interests in principal amount of trust credit card receivables
Sold to investors via trust-issued securities	0.2	0.3
Retained by Citigroup as trust-issued securities	0.1	0.1
Retained by Citigroup via non-certificated interests	0.2	0.2
Total ownership interests in principal amount of trust credit card receivables	$ 0.5	$ 0.6