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NONINTEREST INCOME - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018
Trust and investment services fees |  |
Trailing commission income | $ 4 | $ 8

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- Definition Contract with Customer, Trailing Commission Income + References No definition available. + Details
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Namespace Prefix: | cfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_ProductOrServiceAxis=cfg_TrustandInvestmentServicesFeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |