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Loans and Leases - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accrued interest $ 180   $ 180   $ 134
Net loans and leases 56,690   56,690   54,189
Loans and leases 57,354   57,354   54,859
Troubled debt restructurings loans 204   204   206
C&I | Collateral Pledged          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and leases 116   116   120
Allowance for credit loss, writeoff, collateral 5   9    
Loans Held For Sale, Residential Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Troubled debt restructurings loans 31   31   35
Commercial: | Commercial and industrial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and leases 31,620   31,620   31,068
Commercial: | Commercial and industrial | Loans to mortgage companies          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and leases $ 2,710   $ 2,710   4,518
Percentage contributed 22.00%   22.00%    
Commercial: | Commercial and industrial | Finance And Insurance Companies          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and leases $ 4,100   $ 4,100    
Commercial: | Commercial and industrial | C&I          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and leases 28,910   28,910   26,550
Commercial: | Commercial and industrial | C&I | Collateral Pledged          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and leases 108   108    
Commercial: | Commercial real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and leases 13,021   13,021   12,109
Commercial: | Commercial real estate | CRE          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and leases 13,021   13,021   12,109
Commercial: | Commercial real estate | CRE | Collateral Pledged          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and leases 8   8    
Consumer:          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and leases 11,864   11,864   10,772
Consumer: | Consumer Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and leases 11,864   11,864   10,772
Consumer: | Consumer Real Estate | Collateral Pledged          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for credit loss, writeoff, collateral 2 $ 0 2 $ 0  
Consumer: | Consumer Real Estate | HELOC          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and leases 1,977   1,977   1,964
Consumer: | Consumer Real Estate | HELOC | Collateral Pledged          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and leases 7   7   7
Consumer: | Consumer Real Estate | Real estate installment loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and leases 9,887   9,887   8,808
Consumer: | Consumer Real Estate | Real estate installment loans | Collateral Pledged          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and leases 28   28   20
Asset Pledged as Collateral          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net loans and leases $ 37,400   $ 37,400   $ 36,600