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BUSINESS SEGMENTS - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
segment
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Number of segments 2us-gaap_NumberOfReportableSegments  
Revenues $ 1,183us-gaap_Revenues $ 1,166us-gaap_Revenues
Consumer Banking    
Segment Reporting Information [Line Items]    
Revenues 752us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_ConsumerBankingMember		 756us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_ConsumerBankingMember
Consumer Banking | Maximum    
Segment Reporting Information [Line Items]    
Revenues 25us-gaap_Revenues
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_ConsumerBankingMember		  
Commercial Banking    
Segment Reporting Information [Line Items]    
Revenues 376us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_CommercialBankingMember		 363us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_CommercialBankingMember
Commercial Banking | Minimum    
Segment Reporting Information [Line Items]    
Revenues 25us-gaap_Revenues
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_CommercialBankingMember		  
Commercial Banking | Maximum    
Segment Reporting Information [Line Items]    
Revenues $ 2,500us-gaap_Revenues
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementBusinessSegmentsAxis
= cfg_CommercialBankingMember