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v3.23.1

Allowance For Credit Losses (ModificationsByClassAndSegment) (Details) $ in Millions | Mar. 31, 2023 USD ($)
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Financing Receivable, Modifications [Line Items] |
Term extension, amount | $ 45
Term Extension, Percentage | 0.05%
Payment Deferral, Amount | $ 164
Payment Deferral, Percentage | 0.17%
Term Extension and Interest Rate Modification, Amount | $ 3
Term Extension and Interest Rate Modification, Percentage | 0.00%
Total Modifications, Amount | $ 212
Modification, Percentage | 0.22%
Commercial Portfolio Segment [Member] |
Financing Receivable, Modifications [Line Items] |
Term extension, amount | $ 21
Term Extension, Percentage | 0.04%
Payment Deferral, Amount | $ 164
Payment Deferral, Percentage | 0.29%
Term Extension and Interest Rate Modification, Amount | $ 0
Term Extension and Interest Rate Modification, Percentage | 0.00%
Total Modifications, Amount | $ 185
Modification, Percentage | 0.32%
Consumer Portfolio Segment [Member] |
Financing Receivable, Modifications [Line Items] |
Term extension, amount | $ 24
Term Extension, Percentage | 0.07%
Payment Deferral, Amount | $ 0
Payment Deferral, Percentage | 0.00%
Term Extension and Interest Rate Modification, Amount | $ 3
Term Extension and Interest Rate Modification, Percentage | 0.01%
Total Modifications, Amount | $ 27
Modification, Percentage | 0.09%
Commercial And Industrial [Member] |
Financing Receivable, Modifications [Line Items] |
Term extension, amount | $ 18
Term Extension, Percentage | 0.03%
Payment Deferral, Amount | $ 164
Payment Deferral, Percentage | 0.32%
Term Extension and Interest Rate Modification, Amount | $ 0
Term Extension and Interest Rate Modification, Percentage | 0.00%
Total Modifications, Amount | $ 182
Modification, Percentage | 0.35%
Commercial Real Estate Mortgage - Owner-Occupied [Member] |
Financing Receivable, Modifications [Line Items] |
Term extension, amount | $ 2
Term Extension, Percentage | 0.04%
Payment Deferral, Amount | $ 0
Payment Deferral, Percentage | 0.00%
Term Extension and Interest Rate Modification, Amount | $ 0
Term Extension and Interest Rate Modification, Percentage | 0.00%
Total Modifications, Amount | $ 2
Modification, Percentage | 0.05%
Commercial Real Estate Construction - Owner-Occupied [Member] |
Financing Receivable, Modifications [Line Items] |
Term extension, amount | $ 1
Term Extension, Percentage | 0.17%
Payment Deferral, Amount | $ 0
Payment Deferral, Percentage | 0.00%
Term Extension and Interest Rate Modification, Amount | $ 0
Term Extension and Interest Rate Modification, Percentage | 0.00%
Total Modifications, Amount | $ 1
Modification, Percentage | 0.17%
Residential First Mortgage [Member] |
Financing Receivable, Modifications [Line Items] |
Term extension, amount | $ 22
Term Extension, Percentage | 0.12%
Payment Deferral, Amount | $ 0
Payment Deferral, Percentage | 0.00%
Term Extension and Interest Rate Modification, Amount | $ 2
Term Extension and Interest Rate Modification, Percentage | 0.01%
Total Modifications, Amount | $ 24
Modification, Percentage | 0.13%
Home Equity Lines of Credit[Member] |
Financing Receivable, Modifications [Line Items] |
Term extension, amount | $ 1
Term Extension, Percentage | 0.02%
Payment Deferral, Amount | $ 0
Payment Deferral, Percentage | 0.00%
Term Extension and Interest Rate Modification, Amount | $ 0
Term Extension and Interest Rate Modification, Percentage | 0.00%
Total Modifications, Amount | $ 1
Modification, Percentage | 0.03%
Home Equity Loan [Member] |
Financing Receivable, Modifications [Line Items] |
Term extension, amount | $ 1
Term Extension, Percentage | 0.04%
Payment Deferral, Amount | $ 0
Payment Deferral, Percentage | 0.00%
Term Extension and Interest Rate Modification, Amount | $ 1
Term Extension and Interest Rate Modification, Percentage | 0.06%
Total Modifications, Amount | $ 2
Modification, Percentage | 0.09%

X
- Definition Modification to troubled borrowers, Term extension, amount + References No definition available. + Details
Name: | rf_ModificationToTroubledBorrowersTermExtensionAmount
Namespace Prefix: | rf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Modifications to troubled borrowers, Payment Deferral, Amount + References No definition available. + Details
Name: | rf_ModificationsToTroubledBorrowersPaymentDeferralAmount
Namespace Prefix: | rf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Modifications to troubled borrowers, Payment Deferral, Percentage + References No definition available. + Details
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Namespace Prefix: | rf_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Modifications to troubled borrowers, Term Extension and Interest Rate Modification, Amount + References No definition available. + Details
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Namespace Prefix: | rf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Modifications to troubled borrowers, Term Extension and Interest Rate Modification, Percentage + References No definition available. + Details
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- Definition Modifications to troubled borrowers, Term Extension, Percentage + References No definition available. + Details
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- Definition Total Modifications to troubled borrowers, Amount + References No definition available. + Details
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Namespace Prefix: | rf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total modifications to troubled borrowers, Percentage + References No definition available. + Details
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Namespace Prefix: | rf_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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

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