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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Funding Commitments (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount $ 9,078c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss $ 8,313c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
Liquidity facilities Citigroup    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 3,650c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember		 3,675c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember
Loan commitments Citigroup    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 5,428c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember		 4,638c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember
Citicorp    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 8,109c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember		 7,323c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
Citicorp | Liquidity facilities Citigroup    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 3,650c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember		 3,675c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember
Citicorp | Liquidity facilities Citigroup | Asset-based financing    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 5c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember		 5c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember
Citicorp | Liquidity facilities Citigroup | Municipal securities tender option bond trusts (TOBs)    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 3,645c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= c_MunicipalSecuritiesTenderOptionBondTrustsMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember		 3,670c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= c_MunicipalSecuritiesTenderOptionBondTrustsMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember
Citicorp | Liquidity facilities Citigroup | Municipal investments    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 0c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= c_MunicipalInvestmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember		 0c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= c_MunicipalInvestmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember
Citicorp | Liquidity facilities Citigroup | Investment funds    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 0c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= c_InvestmentFundsMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember		 0c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= c_InvestmentFundsMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember
Citicorp | Liquidity facilities Citigroup | Other    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 0c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= us-gaap_OtherThanSecuritiesInvestmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember		 0c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= us-gaap_OtherThanSecuritiesInvestmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember
Citicorp | Loan commitments Citigroup    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 4,459c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember		 3,648c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember
Citicorp | Loan commitments Citigroup | Asset-based financing    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 3,133c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember		 2,180c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember
Citicorp | Loan commitments Citigroup | Municipal securities tender option bond trusts (TOBs)    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 0c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= c_MunicipalSecuritiesTenderOptionBondTrustsMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember		 0c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= c_MunicipalSecuritiesTenderOptionBondTrustsMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember
Citicorp | Loan commitments Citigroup | Municipal investments    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 1,162c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= c_MunicipalInvestmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember		 1,321c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= c_MunicipalInvestmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember
Citicorp | Loan commitments Citigroup | Investment funds    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 125c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= c_InvestmentFundsMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember		 124c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= c_InvestmentFundsMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember
Citicorp | Loan commitments Citigroup | Other    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 39c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= us-gaap_OtherThanSecuritiesInvestmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember		 23c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= us-gaap_OtherThanSecuritiesInvestmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CiticorpSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember
Citi Holdings    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 969c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_StatementBusinessSegmentsAxis
= c_CitiHoldingsSegmentMember		 990c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_StatementBusinessSegmentsAxis
= c_CitiHoldingsSegmentMember
Citi Holdings | Liquidity facilities Citigroup    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 0c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_StatementBusinessSegmentsAxis
= c_CitiHoldingsSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember		 0c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_StatementBusinessSegmentsAxis
= c_CitiHoldingsSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember
Citi Holdings | Liquidity facilities Citigroup | Asset-based financing    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 0c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CitiHoldingsSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember		 0c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CitiHoldingsSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember
Citi Holdings | Liquidity facilities Citigroup | Municipal investments    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 0c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= c_MunicipalInvestmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CitiHoldingsSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember		 0c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= c_MunicipalInvestmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CitiHoldingsSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LiquidityFacilitiesMember
Citi Holdings | Loan commitments Citigroup    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 969c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_StatementBusinessSegmentsAxis
= c_CitiHoldingsSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember		 990c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_StatementBusinessSegmentsAxis
= c_CitiHoldingsSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember
Citi Holdings | Loan commitments Citigroup | Asset-based financing    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount 81c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CitiHoldingsSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember		 86c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CitiHoldingsSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember
Citi Holdings | Loan commitments Citigroup | Municipal investments    
Funding Commitments for Significant Unconsolidated VIEs    
Notional amount $ 888c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= c_MunicipalInvestmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CitiHoldingsSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember		 $ 904c_VariableInterestEntityFundingCommitmentsUnfundedMaximumExposureToLoss
/ us-gaap_FinancialInstrumentAxis
= c_MunicipalInvestmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= c_CitiHoldingsSegmentMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= c_LoanCommitmentsMember