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RETIREMENT BENEFITS - Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Change in accumulated other comprehensive income (loss)      
Beginning-of-period balance, net of tax $ (5,159)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax $ (3,989)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax $ (3,989)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Actuarial assumptions changes and plan experience (416)c_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentForActuarialAssumptionChangesAndPlanExperienceBeforeTax   (3,404)c_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentForActuarialAssumptionChangesAndPlanExperienceBeforeTax
Net asset gain (loss) due to difference between actual and expected returns 165c_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentForActualPlanAssetReturnsExceedingExpectedReturnsBeforeTax   833c_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentForActualPlanAssetReturnsExceedingExpectedReturnsBeforeTax
Net amortizations 64c_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax   202c_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax
Prior service credit (6)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax   13us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax
Curtailment/settlement loss 0us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax   67us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax
Foreign exchange impact and other 72c_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansForeignExchangeImpactAndOtherAdjustmentsBeforeTax   459c_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansForeignExchangeImpactAndOtherAdjustmentsBeforeTax
Change in deferred taxes, net 31us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent 22us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent 660us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent
Change, net of tax (90)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent [1] (33)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent [1] (1,170)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent
End-of-period balance, net of tax $ (5,249)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax   $ (5,159)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
[1] Reflects adjustments based on the actuarial valuations of the Company’s significant pension and postretirement plans, including changes in the mortality assumptions at March 31, 2015, and amortization of amounts previously recognized in Accumulated other comprehensive income (loss). See Note 8 to the Consolidated Financial Statements.