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INCENTIVE PLANS - Performance Share Units (Details) (Performance Share Units)
 12 Months Ended
Dec. 31, 2014
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Period used for calculation of performance goals 3 years
Number of shares of common stock equivalent to each target share 1c_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesOfCommonStockEquivalentToEachTargetShare
Minimum
  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Percentage of target shares earned 0.00%c_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetSharesEarned
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= c_PerformanceShareUnitsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum
  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Percentage of target shares earned 150.00%c_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetSharesEarned
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= c_PerformanceShareUnitsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember