CONTINGENCIES (Details) (USD $)			0 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	0 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Apr. 30, 2013 Residential Mortgage-Backed Securities Investor Actions and Repurchase Claims In Re Citigroup Inc. Securities Litigation	Jun. 30, 2013 KIKOs CKI item	Jul. 31, 2013 Interbank Offered Rates-Related Litigation and Other Matters item	Jun. 30, 2013 Interbank Offered Rates-Related Litigation and Other Matters item	Jun. 14, 2013 Interbank Offered Rates-Related Litigation and Other Matters MAS item
CONTINGENCIES
Possible loss, high end of the range	$ 5,000,000,000	$ 5,000,000,000
Contingencies
Aggregate original purchase amount			8,000,000,000
Aggregate original purchase amount of the purchases covered by tolling agreements			6,000,000,000
Number civil lawsuits filed by small and medium-sized enterprises				94
Number of decision rendered at district court level				84
Decisions favorable to entity				64
Number of decisions awarded to plaintiff for portion of damages sought				20
Contingent loss as claimed against the company				28,000,000
Number of decisions appealed at the high court				62
Number of cases decided at the high court				22
Number of decisions favorable to the entity in the high court				13
Number of decisions awarded by the high court to the plaintiff for a portion of damages sought				9
Increase in damages awarded				$ 9,800,000
Number of decisions appealed at the Supreme court				7
Number of individual actions filed against the entity in federal court by municipal and state government entities					6	6
Number of banks whose results are reviewed by the Monetary Authority of Singapore							20
Period for which additional statutory reserves are required to be maintained							1 year