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EMPLOYEE BENEFITS - Plan Amounts Recognized in OCI (Details) (USD $)
 0 Months Ended 12 Months Ended
Sep. 01, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]        
Net periodic pension (income) cost   $ (8,000,000)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax [1] $ (3,000,000)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax $ 150,000,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Net actuarial (gain) loss   237,000,000us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax [1] (174,000,000)us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax 169,000,000us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
Amortization of prior service credit   0us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax [1] 0us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax 1,000,000us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
Amortization of prior service credit   (10,000,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax [1] (14,000,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax (38,000,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
Settlement   0cfg_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansSettlement [1] 0cfg_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansSettlement (92,000,000)cfg_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansSettlement
Divestiture   (35,000,000)cfg_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansDivestitures [1] 0cfg_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansDivestitures 0cfg_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansDivestitures
Total recognized in other comprehensive income   192,000,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax [1] (188,000,000)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax 40,000,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Total recognized in net periodic pension cost and other comprehensive income   184,000,000cfg_NetPeriodicBenefitCostandOtherComprehensiveIncome [1] (191,000,000)cfg_NetPeriodicBenefitCostandOtherComprehensiveIncome 190,000,000cfg_NetPeriodicBenefitCostandOtherComprehensiveIncome
Qualified Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Assets transferred to Affiliate plans 129,000,000us-gaap_DefinedBenefitPlanDivestituresPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 129,000,000us-gaap_DefinedBenefitPlanDivestituresPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 [2] 0us-gaap_DefinedBenefitPlanDivestituresPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 0us-gaap_DefinedBenefitPlanDivestituresPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Liabilities transferred to Affiliate plans 148,000,000us-gaap_DefinedBenefitPlanDivestituresBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 148,000,000us-gaap_DefinedBenefitPlanDivestituresBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		    
Non-Qualified Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Assets transferred to Affiliate plans   0us-gaap_DefinedBenefitPlanDivestituresPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		 [2] 0us-gaap_DefinedBenefitPlanDivestituresPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		 0us-gaap_DefinedBenefitPlanDivestituresPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Liabilities transferred to Affiliate plans $ 7,000,000us-gaap_DefinedBenefitPlanDivestituresBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		 $ 7,000,000us-gaap_DefinedBenefitPlanDivestituresBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		    
[1] Results for the period September 1, 2014 through December 31, 2014 excluded $129 million in qualified plan assets, $148 million in qualified plan liabilities and $7 million in non-qualified plan liabilities transferred to Affiliates on September 1, 2014.
[2] December 31, 2014 amounts excluded $129 million in qualified plan assets, $148 million in qualified plan liabilities and $7 million in non-qualified plan liabilities transferred to Affiliates on September 1, 2014.