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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Loans with Indicators of High Credit Risk (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
High loan-to-value    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance $ 3,168us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskHighLoantovalueLoansMember		 $ 3,541us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskHighLoantovalueLoansMember
High loan-to-value | Residential Mortgages    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 697us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskHighLoantovalueLoansMember		 773us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskHighLoantovalueLoansMember
High loan-to-value | Home Equity Loans and Lines of Credit    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 1,429us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskHighLoantovalueLoansMember		 1,743us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskHighLoantovalueLoansMember
High loan-to-value | Home Equity Products serviced by others    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 1,042us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_ConsumerHomeEquityProductsServicedbyOthersMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskHighLoantovalueLoansMember		 1,025us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_ConsumerHomeEquityProductsServicedbyOthersMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskHighLoantovalueLoansMember
High loan-to-value | Credit Cards    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CreditCardReceivablesMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskHighLoantovalueLoansMember		 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CreditCardReceivablesMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskHighLoantovalueLoansMember
Interest only/negative amortization    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 937us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskInterestonlyandNegativeAmortizationResidentialMortgagesMember		 894us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskInterestonlyandNegativeAmortizationResidentialMortgagesMember
Interest only/negative amortization | Residential Mortgages    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 937us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskInterestonlyandNegativeAmortizationResidentialMortgagesMember		 894us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskInterestonlyandNegativeAmortizationResidentialMortgagesMember
Interest only/negative amortization | Home Equity Loans and Lines of Credit    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskInterestonlyandNegativeAmortizationResidentialMortgagesMember		 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskInterestonlyandNegativeAmortizationResidentialMortgagesMember
Interest only/negative amortization | Home Equity Products serviced by others    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_ConsumerHomeEquityProductsServicedbyOthersMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskInterestonlyandNegativeAmortizationResidentialMortgagesMember		 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_ConsumerHomeEquityProductsServicedbyOthersMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskInterestonlyandNegativeAmortizationResidentialMortgagesMember
Interest only/negative amortization | Credit Cards    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CreditCardReceivablesMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskInterestonlyandNegativeAmortizationResidentialMortgagesMember		 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CreditCardReceivablesMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskInterestonlyandNegativeAmortizationResidentialMortgagesMember
Low introductory rate    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 87us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLowIntroductoryRateLoansMember		 98us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLowIntroductoryRateLoansMember
Low introductory rate | Residential Mortgages    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLowIntroductoryRateLoansMember		 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLowIntroductoryRateLoansMember
Low introductory rate | Home Equity Loans and Lines of Credit    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLowIntroductoryRateLoansMember		 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLowIntroductoryRateLoansMember
Low introductory rate | Home Equity Products serviced by others    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_ConsumerHomeEquityProductsServicedbyOthersMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLowIntroductoryRateLoansMember		 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_ConsumerHomeEquityProductsServicedbyOthersMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLowIntroductoryRateLoansMember
Low introductory rate | Credit Cards    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 87us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CreditCardReceivablesMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLowIntroductoryRateLoansMember		 98us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CreditCardReceivablesMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLowIntroductoryRateLoansMember
Multiple characteristics and other    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 21us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskMultipleIndicatorsMember		 24us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskMultipleIndicatorsMember
Multiple characteristics and other | Residential Mortgages    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 21us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskMultipleIndicatorsMember		 24us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskMultipleIndicatorsMember
Multiple characteristics and other | Home Equity Loans and Lines of Credit    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskMultipleIndicatorsMember		 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskMultipleIndicatorsMember
Multiple characteristics and other | Home Equity Products serviced by others    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_ConsumerHomeEquityProductsServicedbyOthersMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskMultipleIndicatorsMember		 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_ConsumerHomeEquityProductsServicedbyOthersMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskMultipleIndicatorsMember
Multiple characteristics and other | Credit Cards    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CreditCardReceivablesMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskMultipleIndicatorsMember		 0us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CreditCardReceivablesMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskMultipleIndicatorsMember
Credit Risk, Loan Products with Increased Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 4,213us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLoanProductswithIncreasedCreditExposureMember		 4,557us-gaap_NotesReceivableNet
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLoanProductswithIncreasedCreditExposureMember
Credit Risk, Loan Products with Increased Credit Exposure [Member] | Residential Mortgages    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 1,655us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLoanProductswithIncreasedCreditExposureMember		 1,691us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLoanProductswithIncreasedCreditExposureMember
Credit Risk, Loan Products with Increased Credit Exposure [Member] | Home Equity Loans and Lines of Credit    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 1,429us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLoanProductswithIncreasedCreditExposureMember		 1,743us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLoanProductswithIncreasedCreditExposureMember
Credit Risk, Loan Products with Increased Credit Exposure [Member] | Home Equity Products serviced by others    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance 1,042us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_ConsumerHomeEquityProductsServicedbyOthersMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLoanProductswithIncreasedCreditExposureMember		 1,025us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_ConsumerHomeEquityProductsServicedbyOthersMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLoanProductswithIncreasedCreditExposureMember
Credit Risk, Loan Products with Increased Credit Exposure [Member] | Credit Cards    
Financing Receivable, Recorded Investment [Line Items]    
Investment in loan balance $ 87us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CreditCardReceivablesMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLoanProductswithIncreasedCreditExposureMember		 $ 98us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CreditCardReceivablesMember
/ us-gaap_InternalCreditAssessmentAxis
= cfg_CreditRiskLoanProductswithIncreasedCreditExposureMember