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DOCUMENT AND ENTITY INFORMATION - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 21, 2024
Jun. 30, 2023
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 001-34034    
Entity Registrant Name REGIONS FINANCIAL CORPORATION    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001281761    
Current Fiscal Year End Date --12-31    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 63-0589368    
Entity Address, Address Line One 1900 Fifth Avenue North    
Entity Address, City or Town Birmingham    
Entity Address, State or Province AL    
Entity Address, Postal Zip Code 35203    
City Area Code 800    
Local Phone Number 734-4667    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 16,319,687,553
Entity Common Stock, Shares Outstanding   918,864,048  
Documents Incorporated by Reference
Portions of the proxy statement for the registrant's 2024 Annual Meeting of Shareholders are incorporated by reference into Part III to the extent described therein.
    
Common Stock [Member]      
Entity Information [Line Items]      
Title of 12(b) Security Common Stock, $.01 par value    
Trading Symbol RF    
Security Exchange Name NYSE    
Series B Preferred Stock [Member]      
Entity Information [Line Items]      
Title of 12(b) Security 6.375% Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series B    
Trading Symbol RF PRB    
Security Exchange Name NYSE    
Series C Preferred Stock [Member]      
Entity Information [Line Items]      
Title of 12(b) Security 5.700% Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series C    
Trading Symbol RF PRC    
Security Exchange Name NYSE    
Series E Preferred Stock      
Entity Information [Line Items]      
Title of 12(b) Security 4.45% Non-Cumulative Perpetual Preferred Stock, Series E    
Trading Symbol RF PRE    
Security Exchange Name NYSE