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Loans & Leases - Components of Net Investment in Leases (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Net investment in lease financing $ 109,375 $ 95,086
Net discount 249 296
Leveraged leases 429  
Commercial Lease Financing [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Rentals receivable, net of principal and interest on nonrecourse debt   3,256
Estimated residual value of leased assets   804
Initial direct cost, net of amortization   19
Gross investment in lease financing   4,079
Unearned income   (479)
Net investment in lease financing   $ 3,600
Direct financing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Lease payment receivable 2,196  
Sales type lease unguaranteed residual asset 220  
Net discount (7)  
Direct financing deferred selling profit 0  
Sales-type    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Lease payment receivable 510  
Sales type lease unguaranteed residual asset 15  
Net discount $ 0