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DOCUMENT AND ENTITY INFORMATION - USD ($)
 12 Months Ended
Dec. 31, 2022
Feb. 22, 2023
Jun. 30, 2022
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Document Transition Report false    
Entity File Number 001-34034    
Entity Registrant Name REGIONS FINANCIAL CORPORATION    
Entity Central Index Key 0001281761    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
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    
Entity Shell Company false    
Entity Public Float     $ 17,100,675,350
Entity Common Stock, Shares Outstanding   934,561,674  
Documents Incorporated by Reference Portions of the proxy statement for the registrant's 2023 Annual Meeting of Shareholders are incorporated by reference into Part III to the extent described therein.    
Amendment Flag false    
ICFR Auditor Attestation Flag true    
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