Financial Effect, Weighted average payment extension

No definition available.

Name:	rf_FinancialEffectWeightedAveragePaymentExtension
Namespace Prefix:	rf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-34

Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-33

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

+ Details

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

- Definition

Percentage of decrease in weighted average contractual interest rate of financing receivable modified for debtor experiencing financial difficulty.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModifiedWeightedAverageInterestRateDecreaseFromModification
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rf_CommercialAndIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityAndInterestRateReductionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rf_CommercialRealEstateMortgageOwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rf_CommercialInvestorRealEstateConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rf_CommercialinvestorrealestatemortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rf_ResidentialFirstMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_PaymentDeferralMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Loans And The Allowance For Credit Losses (Financial Impact Of Modifications To Troubled Borrowers) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Commercial And Industrial [Member] \| Extended Maturity
Financing Receivable, Modifications [Line Items]
Financial Effect, Term Extension	11 months 1 day	1 year 29 days	9 months	1 year 9 months 29 days
Commercial And Industrial [Member] \| Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financial Effect, Term Extension		1 year 2 months 1 day		1 year 2 months 1 day
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification		200.00%		200.00%
Commercial Real Estate Mortgage - Owner-Occupied [Member] \| Extended Maturity
Financing Receivable, Modifications [Line Items]
Financial Effect, Term Extension	9 months	1 year 5 months 1 day	1 year 9 months	1 year
Commercial Investor Real Estate Construction [Member] \| Extended Maturity
Financing Receivable, Modifications [Line Items]
Financial Effect, Term Extension		2 months 1 day
Commercial investor real estate mortgage [Member] \| Extended Maturity
Financing Receivable, Modifications [Line Items]
Financial Effect, Term Extension			8 months 1 day	9 months
Residential First Mortgage [Member] \| Extended Maturity
Financing Receivable, Modifications [Line Items]
Financial Effect, Term Extension	6 years	7 years	7 years	7 years
Residential First Mortgage [Member] \| Payment Deferral
Financing Receivable, Modifications [Line Items]
Financial Effect, Payments deferral		0.42	0.67	0.5
Residential First Mortgage [Member] \| Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financial Effect, Term Extension	6 years	4 years	5 years	5 years
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification	1.00%	1.00%	1.00%	1.00%
Home Equity Lines of Credit[Member] \| Extended Maturity
Financing Receivable, Modifications [Line Items]
Financial Effect, Term Extension			29 years
Home Equity Lines of Credit[Member] \| Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financial Effect, Term Extension	25 years	24 years	26 years	23 years
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification	1.00%	2.00%	1.00%	2.00%
Home Equity Loan [Member] \| Extended Maturity
Financing Receivable, Modifications [Line Items]
Financial Effect, Term Extension	7 years	16 years	11 years	12 years
Home Equity Loan [Member] \| Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Financial Effect, Term Extension	21 years	24 years	21 years	25 years
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification	3.00%	3.00%	3.00%	2.00%