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LOANS AND LEASES - Loans Held For Sale (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for sale | $ 1,750 | $ 1,219
Other loans held for sale | 455 | 101
Residential loans held for sale |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for sale | 1,615 | 967
Other loans held for sale | 0 | 0
Commercial real estate loans held for sale |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans held for sale | 135 | 252
Other loans held for sale | $ 455 | $ 101

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- Definition The amount of other loans receivable that will be sold to other entities. + References No definition available. + Details
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Namespace Prefix: | cfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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
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Namespace Prefix: | us-gaap_
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- Definition The face amount of loans that will be sold to other entities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |