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ALLOWANCE FOR CREDIT LOSSES - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2012
Sep. 30, 2012
Mar. 31, 2012
Allowance for loan losses disclosures            
Gross credit losses $ 11,108us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs $ 12,769us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs $ 17,005us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs      
Net reserve build (releases) (1,879)c_ProvisionForLoanAndLeaseLossesForReserveBuildsOrReleasesNet (1,961)c_ProvisionForLoanAndLeaseLossesForReserveBuildsOrReleasesNet (1,908)c_ProvisionForLoanAndLeaseLossesForReserveBuildsOrReleasesNet      
Net specific reserve builds (releases) (266)c_ProvisionForLoanAndLeaseLossesForSpecificReserveBuildsOrReleasesNet (898)c_ProvisionForLoanAndLeaseLossesForSpecificReserveBuildsOrReleasesNet (1,865)c_ProvisionForLoanAndLeaseLossesForSpecificReserveBuildsOrReleasesNet      
Reduction of allowance for loan and leases losses due to loans sold or transferred to held-for-sale or to discontinued operations 1,100c_AllowanceForLoanAndLeaseLossesLoansSoldOrTransferredToHeldForSaleOrDiscontinuedOperations 2,400c_AllowanceForLoanAndLeaseLossesLoansSoldOrTransferredToHeldForSaleOrDiscontinuedOperations        
Reduction of allowance for loan and leases losses due to transfer to real estate loan portfolio 411c_AllowanceForLoanAndLeaseLossesLoansTransferredToRealEstateLoanPortfolio          
Increase (decrease) in allowance due to non-provision transfer of reserves associated with deferred interest to other assets   230c_AllowanceForLoanAndLeaseLossesNonProvisionTransferOfReservesAssociatedWithDeferredInterestToOtherAssets        
Reduction of allowance related to foreign currency translation (463)us-gaap_AllowanceForLoanAndLeaseLossesForeignCurrencyTranslation (220)us-gaap_AllowanceForLoanAndLeaseLossesForeignCurrencyTranslation        
Greece            
Allowance for loan losses disclosures            
Reduction of allowance for loan and leases losses due to loans sold or transferred to held-for-sale or to discontinued operations 204c_AllowanceForLoanAndLeaseLossesLoansSoldOrTransferredToHeldForSaleOrDiscontinuedOperations
/ us-gaap_StatementGeographicalAxis
= country_GR
255c_AllowanceForLoanAndLeaseLossesLoansSoldOrTransferredToHeldForSaleOrDiscontinuedOperations
/ us-gaap_StatementGeographicalAxis
= country_GR
       
Spain            
Allowance for loan losses disclosures            
Reduction of allowance for loan and leases losses due to loans sold or transferred to held-for-sale or to discontinued operations 177c_AllowanceForLoanAndLeaseLossesLoansSoldOrTransferredToHeldForSaleOrDiscontinuedOperations
/ us-gaap_StatementGeographicalAxis
= country_ES
         
Honduras            
Allowance for loan losses disclosures            
Reduction of allowance for loan and leases losses due to loans sold or transferred to held-for-sale or to discontinued operations 29c_AllowanceForLoanAndLeaseLossesLoansSoldOrTransferredToHeldForSaleOrDiscontinuedOperations
/ us-gaap_StatementGeographicalAxis
= country_HN
         
EMEA            
Allowance for loan losses disclosures            
Reduction of allowance for loan and leases losses due to loans sold or transferred to held-for-sale or to discontinued operations 108c_AllowanceForLoanAndLeaseLossesLoansSoldOrTransferredToHeldForSaleOrDiscontinuedOperations
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
         
U.S.            
Allowance for loan losses disclosures            
Reduction of allowance for loan and leases losses due to loans sold or transferred to held-for-sale or to discontinued operations     875c_AllowanceForLoanAndLeaseLossesLoansSoldOrTransferredToHeldForSaleOrDiscontinuedOperations
/ us-gaap_StatementGeographicalAxis
= country_US
     
New OCC guidance            
Allowance for loan losses disclosures            
Gross credit losses       (40)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= c_NewOfficeOfComptrollerOfCurrencyGuidanceMember
635us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= c_NewOfficeOfComptrollerOfCurrencyGuidanceMember
 
Net reserve build (releases)         (600)c_ProvisionForLoanAndLeaseLossesForReserveBuildsOrReleasesNet
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= c_NewOfficeOfComptrollerOfCurrencyGuidanceMember
 
Anticipated forgiveness of principal in connection with National Mortgage Settlement            
Allowance for loan losses disclosures            
Gross credit losses           370us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= c_AnticipatedForgivenessOfPrincipalInConnectionWithNationalMortgageSettlementMember
Net specific reserve builds (releases)           (350)c_ProvisionForLoanAndLeaseLossesForSpecificReserveBuildsOrReleasesNet
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= c_AnticipatedForgivenessOfPrincipalInConnectionWithNationalMortgageSettlementMember
Brazil Creditcard            
Allowance for loan losses disclosures            
Reduction of allowance for loan and leases losses due to loans sold or transferred to held-for-sale or to discontinued operations   $ 360c_AllowanceForLoanAndLeaseLossesLoansSoldOrTransferredToHeldForSaleOrDiscontinuedOperations
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= c_BrazilCreditcardBusinessMember