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Commitments, Contingencies and Guarantees (Credit Risk Of Off-Balance Sheet Financial Instruments By Contractual Amounts) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Other Commitments [Line Items] |  |  |  |  |  |
Unused commitments to extend credit | $ 60,626 |  | $ 56,644 |  |  |
Standby Letters Of Credit Commitment | 1,773 |  | 1,742 |  |  |
Commercial letters of credit | 42 |  | 132 |  |  |
Liabilities associated with standby letters of credit | 31 |  | 25 |  |  |
Assets associated with standby letters of credit | 31 |  | 25 |  |  |
Reserve for unfunded credit commitments | $ 87 | $ 92 | $ 126 | $ 149 | $ 105 | $ 45

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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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- 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
Name: | us-gaap_OtherCommitmentsLineItems
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