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TRADING ACCOUNT ASSETS AND LIABILITIES (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Trading account assets and Trading account liabilities    
Trading account assets $ 296,786us-gaap_TradingSecurities $ 285,928us-gaap_TradingSecurities
Trading account liabilities 139,036us-gaap_TradingLiabilities 108,762us-gaap_TradingLiabilities
Securities sold, not yet purchased    
Trading account assets and Trading account liabilities    
Trading account liabilities 70,944us-gaap_TradingLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_SecuritiesSoldNotYetPurchasedMember		 61,508us-gaap_TradingLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_SecuritiesSoldNotYetPurchasedMember
Derivatives, liabilities    
Trading account assets and Trading account liabilities    
Trading account liabilities 68,092us-gaap_TradingLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember		 47,254us-gaap_TradingLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Derivatives, assets    
Trading account assets and Trading account liabilities    
Trading account assets 67,957us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember		 52,821us-gaap_TradingSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Mortgage-backed securities - U.S. agency-sponsored    
Trading account assets and Trading account liabilities    
Trading account assets 27,053us-gaap_TradingSecurities
/ invest_InvestmentAxis
= c_MortgageBackedSecuritiesIssuedByUSGovernmentCorporationsAndAgenciesMember		 23,955us-gaap_TradingSecurities
/ invest_InvestmentAxis
= c_MortgageBackedSecuritiesIssuedByUSGovernmentCorporationsAndAgenciesMember
Mortgage-backed securities - Prime    
Trading account assets and Trading account liabilities    
Trading account assets 1,271us-gaap_TradingSecurities
/ invest_InvestmentAxis
= c_MortgageBackedSecuritiesPrimeMember		 1,422us-gaap_TradingSecurities
/ invest_InvestmentAxis
= c_MortgageBackedSecuritiesPrimeMember
Mortgage-backed securities - Alt-A    
Trading account assets and Trading account liabilities    
Trading account assets 709us-gaap_TradingSecurities
/ invest_InvestmentAxis
= c_MortgageBackedSecuritiesAltAMember		 721us-gaap_TradingSecurities
/ invest_InvestmentAxis
= c_MortgageBackedSecuritiesAltAMember
Mortgage-backed securities - Subprime    
Trading account assets and Trading account liabilities    
Trading account assets 1,382us-gaap_TradingSecurities
/ invest_InvestmentAxis
= c_MortgageBackedSecuritiesSubprimeMember		 1,211us-gaap_TradingSecurities
/ invest_InvestmentAxis
= c_MortgageBackedSecuritiesSubprimeMember
Mortgage-backed securities - Non-U.S. residential    
Trading account assets and Trading account liabilities    
Trading account assets 1,476us-gaap_TradingSecurities
/ invest_InvestmentAxis
= c_ForeignResidentialMortgageBackedSecuritiesMember		 723us-gaap_TradingSecurities
/ invest_InvestmentAxis
= c_ForeignResidentialMortgageBackedSecuritiesMember
Mortgage-backed securities - Commercial    
Trading account assets and Trading account liabilities    
Trading account assets 4,343us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 2,574us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Mortgage-backed securities    
Trading account assets and Trading account liabilities    
Trading account assets 36,234us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesMember		 30,606us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_MortgageBackedSecuritiesMember
U.S. Treasury and federal agency securities    
Trading account assets and Trading account liabilities    
Trading account assets 20,474us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_USTreasuryAndGovernmentMember		 14,837us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_USTreasuryAndGovernmentMember
U.S. Treasury    
Trading account assets and Trading account liabilities    
Trading account assets 18,906us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_USTreasurySecuritiesMember		 13,537us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_USTreasurySecuritiesMember
Agency obligations    
Trading account assets and Trading account liabilities    
Trading account assets 1,568us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 1,300us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
State and municipal securities    
Trading account assets and Trading account liabilities    
Trading account assets 3,402us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 3,207us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Foreign government securities    
Trading account assets and Trading account liabilities    
Trading account assets 64,937us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember		 74,856us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Corporate    
Trading account assets and Trading account liabilities    
Trading account assets 27,797us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_CorporateDebtSecuritiesMember		 30,534us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_CorporateDebtSecuritiesMember
Equity securities    
Trading account assets and Trading account liabilities    
Trading account assets 57,846us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_EquitySecuritiesMember		 61,776us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_EquitySecuritiesMember
Asset-backed securities    
Trading account assets and Trading account liabilities    
Trading account assets 4,546us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_AssetBackedSecuritiesMember		 5,616us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_AssetBackedSecuritiesMember
Other trading assets    
Trading account assets and Trading account liabilities    
Trading account assets $ 13,593us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember		 $ 11,675us-gaap_TradingSecurities
/ invest_InvestmentAxis
= us-gaap_OtherDebtSecuritiesMember