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Commitments, Contingencies and Guarantees (Credit Risk Of Financial Instruments By Contractual Amounts) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |
Unused commitments to extend credit | $ 67,571 |  | $ 63,232 |  |  |
Standby letters of credit | 2,281 |  | 2,096 |  |  |
Commercial letters of credit | 82 |  | 58 |  |  |
Liabilities associated with standby letters of credit | 38 |  | 33 |  |  |
Assets associated with standby letters of credit | 39 |  | 35 |  |  |
Reserve for unfunded credit commitments | $ 132 | $ 131 | $ 116 | $ 121 | $ 111 | $ 124

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- Definition Assets associated with standby letters of credit + References No definition available. + Details
Name: | rf_AssetsAssociatedWithStandbyLettersOfCredit
Namespace Prefix: | rf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Commercial letters of credit commitment. + References No definition available. + Details
Name: | rf_CommercialLettersOfCreditCommitment
Namespace Prefix: | rf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Liabilities associated with standby letters of credit + References No definition available. + Details
Name: | rf_LiabilitiesAssociatedWithStandbyLettersOfCredit
Namespace Prefix: | rf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Reserve For Unfunded Credit Commitments + References No definition available. + Details
Name: | rf_ReserveForUnfundedCreditCommitments
Namespace Prefix: | rf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Standby letters of credit commitment. + References No definition available. + Details
Name: | rf_StandbyLettersOfCreditCommitment
Namespace Prefix: | rf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
Name: | us-gaap_UnusedCommitmentsToExtendCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant