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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Performance Indicators for Nonperforming Assets (Details)
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases as a percentage of total loans and leases 1.20%us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans 1.18%us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans
Nonperforming assets as a percentage of total assets 0.86%cfg_AssetsRatioofNonperformingAssetstoAllAssets 0.86%cfg_AssetsRatioofNonperformingAssetstoAllAssets
Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases as a percentage of total loans and leases 0.17%us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 0.18%us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Nonperforming assets as a percentage of total assets 0.12%cfg_AssetsRatioofNonperformingAssetstoAllAssets
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 0.13%cfg_AssetsRatioofNonperformingAssetstoAllAssets
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Retail    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases as a percentage of total loans and leases 1.03%us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_RetailPortfolioSegmentMember		 1.00%us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_RetailPortfolioSegmentMember
Nonperforming assets as a percentage of total assets 0.74%cfg_AssetsRatioofNonperformingAssetstoAllAssets
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_RetailPortfolioSegmentMember		 0.73%cfg_AssetsRatioofNonperformingAssetstoAllAssets
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cfg_RetailPortfolioSegmentMember