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BORROWED FUNDS - Short Term Debt (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Short-term Debt [Line Items]    
Total short-term borrowed funds $ 11,425us-gaap_ShortTermBorrowings $ 10,529us-gaap_ShortTermBorrowings
Federal funds purchased    
Short-term Debt [Line Items]    
Total short-term borrowed funds 0us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= us-gaap_FederalFundsPurchasedMember		 574us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= us-gaap_FederalFundsPurchasedMember
Securities sold under agreements to repurchase    
Short-term Debt [Line Items]    
Total short-term borrowed funds 4,421us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember		 3,702us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Other short-term borrowed funds (primarily current portion of FHLB advances)    
Short-term Debt [Line Items]    
Total short-term borrowed funds $ 7,004us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= cfg_OtherShorttermDebtMember		 $ 6,253us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= cfg_OtherShorttermDebtMember