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COMMITMENTS AND CONTINGENCIES - Narrative (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2003
Minimum |  |
Risk Participation Agreements [Abstract] |  |
Risk participation agreements, Average term | 1 year |
Maximum |  |
Risk Participation Agreements [Abstract] |  |
Risk participation agreements, Average term | 8 years |
Marketing rights |  |
Marketing Rights [Abstract] |  |
Commitment period |  | 25 years
Financial standby letters of credit |  |
Letters of Credit [Abstract] |  |
Letters of credit terms | 10 years |
Commercial letters of credit |  |
Letters of Credit [Abstract] |  |
Letters of credit terms | 1 year |

X
- Definition Describe the approximate term of the guarantee or each group of similar guarantees. + References No definition available. + Details
Name: | cfg_GuarantorObligationTerm
Namespace Prefix: | cfg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Letters of Credit [Abstract] + References No definition available. + Details
Name: | cfg_LettersofCreditAbstract
Namespace Prefix: | cfg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Marketing Rights [Abstract] + References No definition available. + Details
Name: | cfg_MarketingRightsAbstract
Namespace Prefix: | cfg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Risk Participation Agreements [Abstract] + References No definition available. + Details
Name: | cfg_RiskParticipationAgreementsAbstract
Namespace Prefix: | cfg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Average period covered by risk participation contracts in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | cfg_RiskParticipationAgreementsAverageTerm
Namespace Prefix: | cfg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LongtermPurchaseCommitmentPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=cfg_NamingRightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_FinancialStandbyLetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=cfg_CommercialLetterofCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |