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CASH AND DUE FROM BANKS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash and Cash Equivalents [Abstract] |  |  |
Interest-bearing cash and due from banks | $ 2,993 | $ 2,045 |
Interest rate on FRB balances | 2.40% |  |
Interest earned on FRB balances | $ 28 | $ 16 | $ 7

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- Definition The fixed interest rate for investments held at the Federal Reserve Bank. + References No definition available. + Details
Name: | cfg_FederalReserveBankDepositsInterestRate
Namespace Prefix: | cfg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest earned on balances in Federal Reserve Bank interest earning accounts. + References No definition available. + Details
Name: | cfg_InterestIncomeFederalReserveBankBalances
Namespace Prefix: | cfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing cash in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet. + References No definition available. + Details
Name: | cfg_InterestbearingCashandDuefromBanks
Namespace Prefix: | cfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CashAndCashEquivalentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration