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Variable Interest Entities (Tables)
 3 Months Ended
Mar. 31, 2024
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, 2024December 31, 2023
 (In millions)
Tax credit investments included in other assets$1,453 $1,415 
Unfunded tax credit commitments included in other liabilities558 592 
Loans and letters of credit commitments719 730 
Funded portion of loans and letters of credit commitments414 395 
Three Months Ended March 31
20242023
 (In millions)
Tax credits and other tax benefits recognized$55 $51 
Tax credit amortization expense included in income tax expense46 41