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SUBSEQUENT EVENTS (Details) - 80 Branches And Deposit Business, HSBC Bank - branch | Feb. 18, 2022 | May 26, 2021
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Subsequent Event [Line Items] |  |
Number of branches acquired |  | 80
Subsequent Event |  |
Subsequent Event [Line Items] |  |
Number of branches acquired | 80 |

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- Definition Business Acquisition, Number Of Branches + References No definition available. + Details
Name: | cfg_BusinessAcquisitionNumberOfBranches
Namespace Prefix: | cfg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=cfg_A80BranchesAndDepositBusinessHSBCBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |