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Loans & Leases (Investment in Lease Financing) (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable    
Rental receivable, net of principal and interest on nonrecourse debt $ 3,684 $ 3,551
Estimated residual value of leased assets 885 903
Initial direct cost, net of amortization 22 23
Gross investment in lease financing 4,591 4,477
Unearned income (523) (503)
Net investment in lease financing [1] $ 4,068 $ 3,974
[1]

The accumulated allowance for uncollectible minimum lease payments was $ 14 and $ 15 at December 31, 2017 and 2016 , respectively.