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Borrowed Funds (Schedule of Maturities of Long-Term Borrowings) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Schedule of Maturities of Long-Term Debt [Line Items]    
Long-term borrowings $ 5,993 $ 2,330
Parent Company    
Schedule of Maturities of Long-Term Debt [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 891  
Long-term Debt, Maturities, Repayments of Principal in Year Two 0  
Long-term Debt, Maturities, Repayments of Principal in Year Three 0  
Long-term Debt, Maturities, Repayments of Principal in Year Four 581  
Long-term Debt, Maturities, Repayments of Principal in Year Five 0  
Long-term Debt, Maturities, Repayments of Principal after Year Five 2,023  
Long-term borrowings 3,495 1,832
Parent Company | Five point Seven Two Two Percent Senior Note due June Two Thousand Thirty | Senior Notes    
Schedule of Maturities of Long-Term Debt [Line Items]    
Long-term borrowings $ 746 0
Stated interest rate 5.722%  
Regions Bank    
Schedule of Maturities of Long-Term Debt [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 2,000  
Long-term Debt, Maturities, Repayments of Principal in Year Two 0  
Long-term Debt, Maturities, Repayments of Principal in Year Three 0  
Long-term Debt, Maturities, Repayments of Principal in Year Four 0  
Long-term Debt, Maturities, Repayments of Principal in Year Five 0  
Long-term Debt, Maturities, Repayments of Principal after Year Five 498  
Long-term borrowings $ 2,498 $ 498