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BUSINESS OPERATING SEGMENTS - Narrative (Details) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2018 USD ($) segment
Segment Reporting Information [Line Items] |
Number of segments | segment | 2
Consumer Banking | Maximum |
Segment Reporting Information [Line Items] |
Customer revenue targets | $ 25
Commercial Banking | Minimum |
Segment Reporting Information [Line Items] |
Customer revenue targets | 25
Commercial Banking | Maximum |
Segment Reporting Information [Line Items] |
Customer revenue targets | $ 2,500

X
- Definition Revenue From Contract With Customer, Customer Revenue Target, Annual Amount + References No definition available. + Details
Name: | cfg_RevenueFromContractWithCustomerCustomerRevenueTargetAnnualAmount
Namespace Prefix: | cfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cfg_ConsumerBankingMember
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_StatementBusinessSegmentsAxis=cfg_CommercialBankingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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