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REGULATORY MATTERS - Narrative (Details) | Dec. 31, 2021 | Dec. 31, 2020
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Mortgage Banking [Abstract] |  |
Minimum Capital Adequacy | 7.90% | 7.90%
Capital conservation buffer | 3.40% | 3.40%

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- Definition Capital Conservation Buffer + References No definition available. + Details
Name: | cfg_CapitalConservationBuffer
Namespace Prefix: | cfg_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The minimum common equity tier 1 ratio (CET1 divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References No definition available. + Details
Name: | cfg_CommonEquityTier1RequiredForCapitalAdequacyToRiskWeightedAssets
Namespace Prefix: | cfg_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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