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CASH AND DUE FROM BANKS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash and Cash Equivalents [Abstract] |  |  |
Deposits on FRB balances | $ 11,700 | $ 2,100 |
Interest rate on FRB balances | 0.10% |  |
Interest earned on FRB balances | $ 10 | $ 28 | $ 28

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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-Bearing Cash and Due from Banks, Federal Reserve Bank Balances + References No definition available. + Details
Name: | cfg_InterestBearingCashandDuefromBanksFederalReserveBankBalances
Namespace Prefix: | cfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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