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Loans and Leases - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accrued interest $ 134   $ 134
Net loans and leases 54,390   54,189
Loans and leases 55,012   54,859
Troubled debt restructurings loans 206   206
C&I      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Collateral for secured borrowings 96   120
Allowance for credit loss, writeoff, collateral 4    
Loans Held For Sale, Residential Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Troubled debt restructurings loans 33   35
Commercial | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 30,798   31,068
Commercial | Commercial and industrial | Loans to mortgage companies      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases $ 3,895   4,518
Percentage contributed 24.00%    
Commercial | Commercial and industrial | Finance And Insurance Companies      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases $ 3,600    
Commercial | Commercial and industrial | C&I      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 26,903   26,550
Collateral for secured borrowings 93    
Commercial | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 12,487   12,109
Commercial | Commercial real estate | CRE      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 12,487   12,109
Collateral for secured borrowings 3    
Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 10,874   10,772
Consumer | Consumer Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 10,874   10,772
Allowance for credit loss, writeoff, collateral 0 $ 0  
Consumer | Consumer Real Estate | HELOC      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 1,894   1,964
Collateral for secured borrowings 7    
Consumer | Consumer Real Estate | Real estate installment loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 8,980   8,808
Collateral for secured borrowings     20
Asset Pledged as Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net loans and leases $ 37,100   $ 36,600