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Loans and Leases - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accrued interest $ 276 $ 276   $ 226
Net loans and leases 61,018 61,018   57,417
Loans and leases $ 61,778 61,778   58,102
Allowance for credit loss, writeoff, collateral   1 $ 2  
Post-Modification Outstanding Recorded  Investment   $ 21   85
TDR loans balance       180
Loans Held For Sale, Residential Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
TDR loans balance       30
Commercial: | Minimum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial loan grades 1 1    
Commercial: | Maximum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial loan grades 16 16    
Commercial: | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases $ 33,163 $ 33,163   31,781
Commercial: | Commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 14,121 14,121   13,228
Loans to mortgage companies | Commercial: | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases $ 2,237 $ 2,237   2,258
Percentage contributed 20.00% 20.00%    
Finance And Insurance Companies | Commercial: | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases $ 4,200 $ 4,200    
C&I | Collateral Pledged        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 245 245   124
C&I | Commercial: | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 30,926 30,926   29,523
Post-Modification Outstanding Recorded  Investment       24
C&I | Commercial: | Commercial and industrial | Collateral Pledged        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 120 120    
CRE | Commercial: | Commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 14,121 14,121   13,228
CRE | Commercial: | Commercial real estate | Collateral Pledged        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 125 125    
Asset Pledged as Collateral        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net loans and leases 47,800 47,800   38,300
Asset Pledged as Collateral | C&I        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivable, allowance for credit loss, writeoff, collateral 82 106    
Asset Pledged as Collateral | HELOC        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 6 6   7
Asset Pledged as Collateral | Real estate installment loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases $ 28 $ 28   $ 26