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Loans (Schedule Of Loan Portfolio, Net Of Unearned Income) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income $ 87,784 [1] $ 85,266 [1] $ 82,963
Loans and Leases Receivable, Deferred Income 630 678  
Commercial And Industrial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 43,758 42,870  
Commercial Real Estate Mortgage - Owner-Occupied [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 5,287 5,405  
Commercial Real Estate Construction - Owner-Occupied [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 264 300  
Commercial Investor Real Estate Mortgage [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 5,441 5,394  
Commercial Investor Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,586 1,869  
Residential First Mortgage [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 17,512 16,575  
Home Equity Lines of Credit[Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 3,744 4,539  
Home Equity Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 2,510 2,713  
Consumer Credit Card Financing Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 1,184 1,213  
OtherConsumerExitPortfolioMember [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income [2] 1,071 2,035  
Other Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 5,427 2,353  
Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 49,309 48,575 45,839
Total Investor Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income 7,027 7,263 6,557
Consumer Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net of unearned income $ 31,448 $ 29,428 $ 30,567
[1] Loans are presented net of unearned income, unamortized discounts and premiums and deferred loan fees and costs of $630 million and $678 million at December 31, 2021 and 2020, respectively.
[2] Regions ceased originating indirect vehicle lending in the second quarter of 2019 and decided not to renew a third party relationship in the fourth quarter of 2019.