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INCENTIVE PLANS - Incentive Compensation Cost (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Number of shares available for grant 51.6us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant    
Incentive compensation cost $ 2,360c_ShareBasedAndDeferredCashIncentiveCompensationExpense $ 2,871c_ShareBasedAndDeferredCashIncentiveCompensationExpense $ 2,728c_ShareBasedAndDeferredCashIncentiveCompensationExpense
Immediately Vested Stock Award      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Incentive compensation cost 51c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= c_ImmediatelyVestedStockAwardMember		 54c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= c_ImmediatelyVestedStockAwardMember		 60c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= c_ImmediatelyVestedStockAwardMember
Stock Option Programs      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Incentive compensation cost 1c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= c_EmployeeAndDirectorsStockOptionsMember		 10c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= c_EmployeeAndDirectorsStockOptionsMember		 99c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= c_EmployeeAndDirectorsStockOptionsMember
Retirement Eligible Employees | Restricted and Deferred Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Incentive compensation cost 525c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= c_RestrictedAndDeferredStockAwardsMember
/ us-gaap_TitleOfIndividualAxis
= c_RetirementEligibleEmployeesMember		 468c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= c_RestrictedAndDeferredStockAwardsMember
/ us-gaap_TitleOfIndividualAxis
= c_RetirementEligibleEmployeesMember		 444c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= c_RestrictedAndDeferredStockAwardsMember
/ us-gaap_TitleOfIndividualAxis
= c_RetirementEligibleEmployeesMember
Nonretirement Eligible Employees | Restricted and Deferred Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Incentive compensation cost 668c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= c_RestrictedAndDeferredStockAwardsMember
/ us-gaap_TitleOfIndividualAxis
= c_NonretirementEligibleEmployeesMember		 862c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= c_RestrictedAndDeferredStockAwardsMember
/ us-gaap_TitleOfIndividualAxis
= c_NonretirementEligibleEmployeesMember		 864c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_AwardTypeAxis
= c_RestrictedAndDeferredStockAwardsMember
/ us-gaap_TitleOfIndividualAxis
= c_NonretirementEligibleEmployeesMember
Deferred Cash Awards and Performance Share Units      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Incentive compensation cost 311c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= c_DeferredCashAwardsAndPerformanceShareUnitsMember		 323c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= c_DeferredCashAwardsAndPerformanceShareUnitsMember		 345c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= c_DeferredCashAwardsAndPerformanceShareUnitsMember
Variable Incentive Compensation      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Incentive compensation cost 803c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= c_VariableIncentiveCompensationMember		 1,076c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= c_VariableIncentiveCompensationMember		 670c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= c_VariableIncentiveCompensationMember
2010 Key Employee Profit Sharing Plan (KEPSP)      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Incentive compensation cost $ 1c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= c_KeyEmployeeProfitSharingPlan2010Member		 $ 78c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= c_KeyEmployeeProfitSharingPlan2010Member		 $ 246c_ShareBasedAndDeferredCashIncentiveCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= c_KeyEmployeeProfitSharingPlan2010Member