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LOANS AND LEASES - Narrative (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for sale $ 322,000,000us-gaap_LoansReceivableHeldForSaleAmount   $ 256,000,000us-gaap_LoansReceivableHeldForSaleAmount
Other loans held for sale 54,000,000cfg_OtherLoansReceivableHeldforsaleAmount   25,000,000cfg_OtherLoansReceivableHeldforsaleAmount
Residential Mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans pledged as collateral for FHLB borrowed funds 22,800,000,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedForFederalHomeLoanBankDebt
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_ResidentialMortgageMember
  22,000,000,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedForFederalHomeLoanBankDebt
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_ResidentialMortgageMember
Loans pledged as collateral to support the contingent ability to borrow at the FRB discount window 13,000,000,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedForOtherArrangements
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_ResidentialMortgageMember
  11,800,000,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedForOtherArrangements
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_ResidentialMortgageMember
Credit cards      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Transfer of portfolio loans and leases to held-for-sale 41,000,000us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerCreditCardFinancingReceivableMember
   
Loans and leases receivable held-for-sale, gross 43,000,000cfg_LoansandLeasesReceivableHeldforsaleGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerCreditCardFinancingReceivableMember
   
Allowance for Loan and Lease Losses, Sales and Other 2,000,000cfg_AllowanceforLoanandLeaseLossesSalesandOther
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerCreditCardFinancingReceivableMember
   
Residential Mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for sale 322,000,000us-gaap_LoansReceivableHeldForSaleAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
  256,000,000us-gaap_LoansReceivableHeldForSaleAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
Residential, including originated home equity products      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans purchased during period 249,000,000us-gaap_PaymentsToAcquireLoansHeldForInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
483,000,000us-gaap_PaymentsToAcquireLoansHeldForInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
 
Mortgage loans sold 273,000,000us-gaap_MortgageLoansOnRealEstateCostOfMortgagesSold
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
126,000,000us-gaap_MortgageLoansOnRealEstateCostOfMortgagesSold
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
 
Consumer Loans Auto Financing Receivable      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans purchased during period 393,000,000us-gaap_PaymentsToAcquireLoansHeldForInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
202,000,000us-gaap_PaymentsToAcquireLoansHeldForInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
 
Student      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans purchased during period 261,000,000us-gaap_PaymentsToAcquireLoansHeldForInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_StudentLoanMember
40,000,000us-gaap_PaymentsToAcquireLoansHeldForInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_StudentLoanMember
 
Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Leases sold $ 111,000,000cfg_LeasesSold
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember