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Borrowings (Schedule of Long-Term Borrowings) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Long-term borrowings $ 2,330 $ 2,284
Parent Company [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 1,832 1,786
Parent Company [Member] | Senior Notes [Member] | Two Point Two Five Percent Senior Notes Due April Two Thousand Twenty Five [Member]    
Debt Instrument [Line Items]    
Long-term borrowings $ 747 747
Debt Instrument, Interest Rate, Stated Percentage 2.25%  
Parent Company [Member] | Senior Notes [Member] | One point Eight Percent Senior Notes Due August Two Thousand Twenty Eight    
Debt Instrument [Line Items]    
Long-term borrowings $ 646 646
Debt Instrument, Interest Rate, Stated Percentage 1.80%  
Parent Company [Member] | Subordinated Debt [Member] | Seven Point Seven Five Percent Subordinated Notes Due September Two Thousand Twenty Four [Member]    
Debt Instrument [Line Items]    
Long-term borrowings $ 100 100
Debt Instrument, Interest Rate, Stated Percentage 7.75%  
Parent Company [Member] | Subordinated Debt [Member] | Six Point Seven Five Percent Subordinated Debentures Due November Two Thousand Twenty Five [Member]    
Debt Instrument [Line Items]    
Long-term borrowings $ 153 153
Debt Instrument, Interest Rate, Stated Percentage 6.75%  
Parent Company [Member] | Subordinated Debt [Member] | Seven Point Three Seven Five Percent Subordinated Notes Due December Two Thousand Thirty Seven [Member]    
Debt Instrument [Line Items]    
Long-term borrowings $ 298 298
Debt Instrument, Interest Rate, Stated Percentage 7.375%  
Parent Company [Member] | Valuation Adjustments On Hedged Long Term Debt [Member]    
Debt Instrument [Line Items]    
Long-term borrowings $ (112) (158)
Regions Bank [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 498 498
Regions Bank [Member] | Subordinated Debt [Member] | Six Point Four Five Percent Subordinated Notes Due June Two Thousand Thirty Seven [Member]    
Debt Instrument [Line Items]    
Long-term borrowings $ 496 496
Debt Instrument, Interest Rate, Stated Percentage 6.45%  
Regions Bank [Member] | Other Long Term Debt [Member]    
Debt Instrument [Line Items]    
Long-term borrowings $ 2 $ 2