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INCOME TAXES - Unrecognized Tax Benefits (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Total unrecognized tax benefits at January 1 $ 1,574,000,000us-gaap_UnrecognizedTaxBenefits $ 3,109,000,000us-gaap_UnrecognizedTaxBenefits $ 3,923,000,000us-gaap_UnrecognizedTaxBenefits
Net amount of increases for current year’s tax positions 135,000,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 58,000,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 136,000,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Gross amount of increases for prior years’ tax positions 175,000,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 251,000,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 345,000,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Gross amount of decreases for prior years’ tax positions (772,000,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (716,000,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (1,246,000,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Amounts of decreases relating to settlements (28,000,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (1,115,000,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (44,000,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Reductions due to lapse of statutes of limitation (30,000,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (15,000,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (3,000,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Foreign exchange, acquisitions and dispositions 6,000,000c_UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromForeignExchangeGainLossOnAcquisitionsAndDispositions 2,000,000c_UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromForeignExchangeGainLossOnAcquisitionsAndDispositions (2,000,000)c_UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromForeignExchangeGainLossOnAcquisitionsAndDispositions
Total unrecognized tax benefits at December 31 1,060,000,000us-gaap_UnrecognizedTaxBenefits 1,574,000,000us-gaap_UnrecognizedTaxBenefits 3,109,000,000us-gaap_UnrecognizedTaxBenefits
Amount of unrecognized tax benefit which would impact effective tax rate if recognized 800,000,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 800,000,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 1,300,000,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Uncertain tax positions recognized   $ 400,000,000c_RecognizationOfUncertainTaxPosition