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PRINCIPAL TRANSACTIONS (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Principal transactions revenue    
Principal transactions revenue $ 1,971us-gaap_PrincipalTransactionsRevenue [1] $ 2,888us-gaap_PrincipalTransactionsRevenue [1]
Interest rate contracts    
Principal transactions revenue    
Principal transactions revenue 1,197us-gaap_PrincipalTransactionsRevenue
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_InterestRateContractMember		 1,390us-gaap_PrincipalTransactionsRevenue
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_InterestRateContractMember
Foreign exchange contracts    
Principal transactions revenue    
Principal transactions revenue 86us-gaap_PrincipalTransactionsRevenue
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_ForeignExchangeContractMember		 548us-gaap_PrincipalTransactionsRevenue
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_ForeignExchangeContractMember
Equity contracts    
Principal transactions revenue    
Principal transactions revenue 114us-gaap_PrincipalTransactionsRevenue
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_EquityContractMember		 138us-gaap_PrincipalTransactionsRevenue
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_EquityContractMember
Commodity and other contracts    
Principal transactions revenue    
Principal transactions revenue 317us-gaap_PrincipalTransactionsRevenue
/ us-gaap_TradingActivityByTypeAxis
= c_CommodityAndOtherContractsMember		 224us-gaap_PrincipalTransactionsRevenue
/ us-gaap_TradingActivityByTypeAxis
= c_CommodityAndOtherContractsMember
Credit products and derivatives    
Principal transactions revenue    
Principal transactions revenue 257us-gaap_PrincipalTransactionsRevenue
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_CreditRiskContractMember		 588us-gaap_PrincipalTransactionsRevenue
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_CreditRiskContractMember
Citicorp    
Principal transactions revenue    
Principal transactions revenue 1,950us-gaap_PrincipalTransactionsRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember		 2,796us-gaap_PrincipalTransactionsRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
Global Consumer Banking    
Principal transactions revenue    
Principal transactions revenue 173us-gaap_PrincipalTransactionsRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= c_GlobalConsumerBankingMember		 172us-gaap_PrincipalTransactionsRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= c_GlobalConsumerBankingMember
Institutional Clients Group    
Principal transactions revenue    
Principal transactions revenue 2,199us-gaap_PrincipalTransactionsRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= c_InstitutionalClientsGroupMember		 2,604us-gaap_PrincipalTransactionsRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= c_InstitutionalClientsGroupMember
Corporate/Other    
Principal transactions revenue    
Principal transactions revenue (422)us-gaap_PrincipalTransactionsRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 20us-gaap_PrincipalTransactionsRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Citi Holdings    
Principal transactions revenue    
Principal transactions revenue $ 21us-gaap_PrincipalTransactionsRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= c_CitiHoldingsSegmentMember		 $ 92us-gaap_PrincipalTransactionsRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= c_CitiHoldingsSegmentMember
[1] Certain prior-period revenue and expense lines and totals were reclassified to conform to the current period’s presentation. See Note 3 to the Consolidated Financial Statements.