CONTINGENCIES (Details) (USD $)			1 Months Ended		6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	May 31, 2012 Residential Mortgage-Backed Securities Investor Actions and Repurchase Claims item	May 15, 2012 Residential Mortgage-Backed Securities Investor Actions and Repurchase Claims	Jun. 30, 2012 KIKOs CKI item	Jun. 30, 2012 Interchange Fees Litigation
CONTINGENCIES
Possible loss, high end of the range	$ 4,000,000,000	$ 4,000,000,000
Contingencies
Investement of other party in CDO's				95,000,000
Number of CDO's			5
Number of failed banks			2
Number of claims made against entity					84
Number of decision rendered at district court level					80
Decisions favorable to entity					64
Number of decisions awarded to plaintiff for portion of damages sought					16
Total damages awarded					19,500,000
Number of plaintiffs' appeals in which the decisions were in CKI's favor					2
Settlement agreement consideration						$ 6,050,000,000
Rebate to merchants participating in the class settlement (as a percent)						10.00%
Period of collecting interchange fees						8 months