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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Modifications [Line Items]    
Mortgage loans collateralized by OREO $ 232cfg_MortgageloanscollateralizedbyOREO  
Larger balance commercial loans minimum balance 3cfg_CommercialLoansLargeBalanceMinimumQualifyingBalance 3cfg_CommercialLoansLargeBalanceMinimumQualifyingBalance
Commitments to lend additional funds to debtors owing receivables which were TDRs 34us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend 53us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend
High loan to value criteria (percent) 90.00%cfg_CreditRiskHighLoantoValueLoansPercentExceedingValueOfUnderlyingCollateral 90.00%cfg_CreditRiskHighLoantoValueLoansPercentExceedingValueOfUnderlyingCollateral
Total commercial    
Financing Receivable, Modifications [Line Items]    
TDR balance 147cfg_TDRBalanceIncludedinImpairedLoans.
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_TotalCommercialMember		 176cfg_TDRBalanceIncludedinImpairedLoans.
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_TotalCommercialMember
Total retail    
Financing Receivable, Modifications [Line Items]    
TDR balance $ 1,200cfg_TDRBalanceIncludedinImpairedLoans.
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_TotalRetailMember		 $ 1,200cfg_TDRBalanceIncludedinImpairedLoans.
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_TotalRetailMember