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PREMISES, EQUIPMENT, AND SOFTWARE - Schedule of Amortization (Details) $ in Millions | Dec. 31, 2019 USD ($)
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Capitalized Software, Expected Future Amortization Expense [Abstract] |
2020 | $ 175
2021 | 136
2022 | 102
2023 | 73
2024 | 46
Thereafter | 62
Total | 594
In-process software | $ 296

X
- Definition The amount of capitalized computer software amortization expense expected to be recognized after the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | cfg_CapitalizedComputerSoftwareAmortizationExpenseThereafter
Namespace Prefix: | cfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of capitalized computer software amortization expense expected to be recognized during year five of the succeeding fiscal years. + References No definition available. + Details
Name: | cfg_CapitalizedComputerSoftwareAmortizationExpenseYearFive
Namespace Prefix: | cfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of capitalized computer software amortization expense expected to be recognized during year four of the succeeding fiscal years. + References No definition available. + Details
Name: | cfg_CapitalizedComputerSoftwareAmortizationExpenseYearFour
Namespace Prefix: | cfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of capitalized computer software amortization expense expected to be recognized during the succeeding fiscal year. + References No definition available. + Details
Name: | cfg_CapitalizedComputerSoftwareAmortizationExpenseYearOne
Namespace Prefix: | cfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of capitalized computer software amortization expense expected to be recognized during year three of the succeeding fiscal years. + References No definition available. + Details
Name: | cfg_CapitalizedComputerSoftwareAmortizationExpenseYearThree
Namespace Prefix: | cfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of capitalized computer software amortization expense expected to be recognized during year two of the succeeding fiscal years. + References No definition available. + Details
Name: | cfg_CapitalizedComputerSoftwareAmortizationExpenseYearTwo
Namespace Prefix: | cfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of capitalized computer software amortization expense to be recognized. + References No definition available. + Details
Name: | cfg_CapitalizedSoftwareAmortizationExpenseTotal
Namespace Prefix: | cfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Capitalized Software Development Costs for Internal Use Software + References No definition available. + Details
Name: | cfg_CapitalizedSoftwareDevelopmentCostsforInternalUseSoftware
Namespace Prefix: | cfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Capitalized Software, Expected Future Amortization Expense [Abstract] + References No definition available. + Details
Name: | cfg_CapitalizedSoftwareExpectedFutureAmortizationExpenseAbstract
Namespace Prefix: | cfg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration