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CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Pre-Tax and After-Tax (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Change in accumulated other comprehensive income (loss), pretax      
Balance at the beginning of the period, pretax $ (27,596)us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1 $ (25,334)us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1 $ (25,807)us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1
Change in net unrealized gains (losses) on investment securities, pretax 2,704us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent (3,537)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent 1,001us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent
Cash flow hedges, pretax 543us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent 1,673us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent 838us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent
Benefit plans, pretax (1,830)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent 1,979us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent (1,378)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent
Foreign currency translation adjustment, pretax (4,881)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent (2,377)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent 12us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent
Change, pretax (3,464)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent (2,262)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent 473us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Balance at the end of the period, pretax (31,060)us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1 (27,596)us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1 (25,334)us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1
Change in accumulated other comprehensive income (loss), tax effect      
Balance at the beginning of the period, tax effect 8,463c_AccumulatedOtherComprehensiveIncomeLossTaxPortion 8,438c_AccumulatedOtherComprehensiveIncomeLossTaxPortion 8,019c_AccumulatedOtherComprehensiveIncomeLossTaxPortion
Change in net unrealized gains (losses) on investment securities, tax effect (1,007)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent 1,300us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent (369)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent
Cash flow hedges, tax effect (207)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent (625)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent (311)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent
Benefit plans 660us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent (698)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent 390us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent
Foreign currency translation adjustment, tax effect (65)us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent 48us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent 709us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent
Change, tax effect (619)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 25us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 419us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Balance at the end of the period, tax effect 7,844c_AccumulatedOtherComprehensiveIncomeLossTaxPortion 8,463c_AccumulatedOtherComprehensiveIncomeLossTaxPortion 8,438c_AccumulatedOtherComprehensiveIncomeLossTaxPortion
Change in accumulated other comprehensive income (loss), after-tax      
Beginning-of-period balance, net of tax (19,133)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (16,896)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (17,788)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Change in net unrealized gains (losses) on investment securities, after-tax 1,697us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent (2,237)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent 632us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Cash flow hedges, after-tax 336us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent 1,048us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent 527us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent
Change, net of tax (1,170)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent [1] 1,281us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent [1] (988)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent [1]
Foreign currency translation adjustment, after-tax (4,946)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent (2,329)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent 721us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Citigroup’s total other comprehensive income (loss) (4,083)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (2,237)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 892us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
End-of-period balance, net of tax $ (23,216)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (19,133)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (16,896)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
[1] Reflects adjustments based on the actuarial valuations of the Company’s significant pension and postretirement plans, including changes in the mortality assumptions at December 31, 2014, and amortization of amounts previously recognized in Accumulated other comprehensive income (loss). See Note 8 to the Consolidated Financial Statements.