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Loans & Leases (Loans and Leases - Additional Information) (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Unamortized premiums and discounts, deferred loan fees and costs, and fair value adjustments $ 297   $ 249  
Unearned Income 315   354  
Loans pledged at the FHLB 16,800   16,700  
Loans pledged at the FRB 45,000   47,300  
Sales type lease - interest income 6      
Direct financing lease - interest income 18 $ 22    
Allowance for loan and lease losses 2,348 $ 1,115 1,202 $ 1,103
Accrued Interest Receivable 347      
Commercial Leases        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan and lease losses $ 46   $ 17