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DOCUMENT AND ENTITY INFORMATION - shares
 6 Months Ended
Jun. 30, 2025
Aug. 04, 2025
Entity Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-34034  
Entity Registrant Name Regions Financial Corporation  
Amendment Flag false  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
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 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 Common Stock, Shares Outstanding   892,308,354
Common Stock    
Entity Information [Line Items]    
Title of 12(b) Security Common Stock, $.01 par value  
Trading Symbol RF  
Security Exchange Name NYSE  
Series C    
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    
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  
Series F Preferred Stock    
Entity Information [Line Items]    
Title of 12(b) Security Non-Cumulative Perpetual Preferred Stock, Series F  
Trading Symbol RF PRF  
Security Exchange Name NYSE