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Variable Interest Entities (Tables)
 3 Months Ended
Mar. 31, 2025
Disclosure Variable Interest Entities Schedule Of Equity Method Investments [Abstract]  
Affordable Housing Tax Credit Investments
A summary of Regions’ tax credit investments and related loans and letters of credit, representing Regions’ maximum exposure to loss, is as follows: 
March 31, 2025December 31, 2024
 (In millions)
Tax credit investments included in other assets$1,559 $1,471 
Unfunded tax credit commitments included in other liabilities546 590 
Loans and letters of credit commitments628 663 
Funded portion of loans and letters of credit commitments288 336 
Three Months Ended March 31
20252024
 (In millions)
Tax credits and other tax benefits recognized$54 $55 
Tax credit amortization expense included in income tax expense47 46