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LOANS - Consumer Loans (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Loans      
Number of loan categories 2c_LoanCategoriesNumber    
Loans, net of unearned income $ 621,054,000,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome   $ 644,635,000,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Consumer      
Loans      
Total loans 342,361,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
  370,652,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
Net unearned income (655,000,000)us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
  (682,000,000)us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
Loans, net of unearned income 341,706,000,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
  369,970,000,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
Loans sold and/or reclassified to held-for-sale 11,900,000,000c_SalesOrReclassificationOfPortfolioLoansToHeldForSale
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
400,000,000c_SalesOrReclassificationOfPortfolioLoansToHeldForSale
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
 
In U.S. offices | Consumer      
Loans      
Total loans 208,776,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_StatementGeographicalAxis
= country_US
  229,860,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_StatementGeographicalAxis
= country_US
In U.S. offices | Consumer | Mortgage and real estate      
Loans      
Total loans 92,005,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_MortgagesMember
/ us-gaap_StatementGeographicalAxis
= country_US
  96,533,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_MortgagesMember
/ us-gaap_StatementGeographicalAxis
= country_US
In U.S. offices | Consumer | Installment, revolving credit and other      
Loans      
Total loans 4,861,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= c_InstallmentsRevolvingCreditAndOtherMember
/ us-gaap_StatementGeographicalAxis
= country_US
  14,450,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= c_InstallmentsRevolvingCreditAndOtherMember
/ us-gaap_StatementGeographicalAxis
= country_US
In U.S. offices | Consumer | Cards      
Loans      
Total loans 105,378,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CreditCardReceivablesMember
/ us-gaap_StatementGeographicalAxis
= country_US
  112,982,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CreditCardReceivablesMember
/ us-gaap_StatementGeographicalAxis
= country_US
In U.S. offices | Consumer | Commercial and industrial      
Loans      
Total loans 6,532,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= c_CommercialAndIndustrialMember
/ us-gaap_StatementGeographicalAxis
= country_US
  5,895,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= c_CommercialAndIndustrialMember
/ us-gaap_StatementGeographicalAxis
= country_US
In offices outside the U.S. | Consumer      
Loans      
Total loans 133,585,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_StatementGeographicalAxis
= c_OutsideOfUnitedStatesMember
  140,792,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_StatementGeographicalAxis
= c_OutsideOfUnitedStatesMember
In offices outside the U.S. | Consumer | Mortgage and real estate      
Loans      
Total loans 50,970,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_MortgagesMember
/ us-gaap_StatementGeographicalAxis
= c_OutsideOfUnitedStatesMember
  54,462,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_MortgagesMember
/ us-gaap_StatementGeographicalAxis
= c_OutsideOfUnitedStatesMember
In offices outside the U.S. | Consumer | Installment, revolving credit and other      
Loans      
Total loans 31,396,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= c_InstallmentsRevolvingCreditAndOtherMember
/ us-gaap_StatementGeographicalAxis
= c_OutsideOfUnitedStatesMember
  31,128,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= c_InstallmentsRevolvingCreditAndOtherMember
/ us-gaap_StatementGeographicalAxis
= c_OutsideOfUnitedStatesMember
In offices outside the U.S. | Consumer | Cards      
Loans      
Total loans 28,681,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CreditCardReceivablesMember
/ us-gaap_StatementGeographicalAxis
= c_OutsideOfUnitedStatesMember
  32,032,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CreditCardReceivablesMember
/ us-gaap_StatementGeographicalAxis
= c_OutsideOfUnitedStatesMember
In offices outside the U.S. | Consumer | Commercial and industrial      
Loans      
Total loans 21,992,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= c_CommercialAndIndustrialMember
/ us-gaap_StatementGeographicalAxis
= c_OutsideOfUnitedStatesMember
  22,561,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= c_CommercialAndIndustrialMember
/ us-gaap_StatementGeographicalAxis
= c_OutsideOfUnitedStatesMember
In offices outside the U.S. | Consumer | Lease financing      
Loans      
Total loans $ 546,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= c_LeaseFinancingMember
/ us-gaap_StatementGeographicalAxis
= c_OutsideOfUnitedStatesMember
  $ 609,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= c_LeaseFinancingMember
/ us-gaap_StatementGeographicalAxis
= c_OutsideOfUnitedStatesMember