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INCENTIVE PLANS - Annual Incentive Awards and Compensation Allowances (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Annual Incentive Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of types of deferred awards generally delivered 2c_DeferredCompensationArrangementsNumberOfTypesOfAwards
/ c_IncentiveCompensationArrangementsByTypeAxis
= c_AnnualIncentiveAwardsMember		  
Annual Incentive Awards | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Threshold value for awards paid entirely as immediate cash bonus (less than $100,000) 100,000c_IncentiveCompensationThresholdValueOfAwardsPaidAsImmediateCashBonus
/ c_IncentiveCompensationArrangementsByTypeAxis
= c_AnnualIncentiveAwardsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Annual Incentive Awards | Capital Accumulation Program Awards (CAP) | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period for CAP and deferred cash awards 3 years  
Annual Incentive Awards | Capital Accumulation Program Awards (CAP) | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period for CAP and deferred cash awards 4 years  
Annual Incentive Awards | Capital Accumulation Program Awards (CAP) | Granted February 2013 and later | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of reduction applicable in case of pretax loss 20.00%c_PercentageOfReductionApplicableInCaseOfPretaxLoss
/ us-gaap_AwardDateAxis
= c_AwardsGrantedFebruary2013Member
/ us-gaap_AwardTypeAxis
= c_CapitalAccumulationProgramAwardsMember
/ c_IncentiveCompensationArrangementsByTypeAxis
= c_AnnualIncentiveAwardsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Annual Incentive Awards | Deferred cash awards | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period for CAP and deferred cash awards 3 years  
Annual Incentive Awards | Deferred cash awards | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period for CAP and deferred cash awards 4 years  
Annual Incentive Awards | Highly compensated employees | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of incentive pay required to be deferred 25.00%c_IncentivePayRequiredToBeDeferredPercentage
/ c_IncentiveCompensationArrangementsByTypeAxis
= c_AnnualIncentiveAwardsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= c_HighlyCompensatedEmployeesMember		  
Annual Incentive Awards | Highly compensated employees | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of incentive pay required to be deferred 60.00%c_IncentivePayRequiredToBeDeferredPercentage
/ c_IncentiveCompensationArrangementsByTypeAxis
= c_AnnualIncentiveAwardsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= c_HighlyCompensatedEmployeesMember		  
Annual Incentive Awards | Identified staff in the European Union (EU)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of immediate incentive delivered in the form of a stock payment 50.00%c_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfIncentiveAwardsDeliveredAsStockPayment
/ c_IncentiveCompensationArrangementsByTypeAxis
= c_AnnualIncentiveAwardsMember
/ us-gaap_TitleOfIndividualAxis
= c_IdentifiedStaffInTheEuropeanUnionMember		  
Period of sale or transfer restriction on stock payment 6 months  
Annual Incentive Awards | Identified staff in the European Union (EU) | Deferred cash awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Holdback period on vested awards 6 months  
Compensation Allowances | Identified staff in the European Union (EU) | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period for CAP and deferred cash awards 1 year  
Compensation Allowances | Identified staff in the European Union (EU) | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period for CAP and deferred cash awards 2 years  
Deferral requirements percentage 100.00%c_DeferredCompensationArrangementsDeferralRequirementsPercentage
/ c_IncentiveCompensationArrangementsByTypeAxis
= c_CompensationAllowancesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= c_IdentifiedStaffInTheEuropeanUnionMember		 100.00%c_DeferredCompensationArrangementsDeferralRequirementsPercentage
/ c_IncentiveCompensationArrangementsByTypeAxis
= c_CompensationAllowancesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= c_IdentifiedStaffInTheEuropeanUnionMember