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DEBT - Long-Term Debt (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term debt $ 210,522,000,000us-gaap_LongTermDebt $ 223,080,000,000us-gaap_LongTermDebt
Carrying value of Principal-Protected Trust Securities 1,700,000,000c_TrustPreferredSecuritiesCarryingValue 1,700,000,000c_TrustPreferredSecuritiesCarryingValue
Citigroup Inc.    
Debt Instrument [Line Items]    
Long-term debt 147,627,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 149,512,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Bank    
Debt Instrument [Line Items]    
Long-term debt 58,699,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= c_BankEntitiesMember		 65,146,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= c_BankEntitiesMember
Bank | Senior debt    
Debt Instrument [Line Items]    
Collateralized long-term advances from Federal Home Loan Bank 16,300,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ dei_LegalEntityAxis
= c_BankEntitiesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 19,800,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ dei_LegalEntityAxis
= c_BankEntitiesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Broker-dealer    
Debt Instrument [Line Items]    
Long-term debt $ 4,196,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= c_BrokerDealerEntitiesMember		 $ 8,422,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= c_BrokerDealerEntitiesMember