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Loans & Leases - Components of Net Investment in Leases (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Net discount $ 297 $ 249
Leveraged leases 379 429
Direct financing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Lease payment receivable 1,985 2,196
Sales type lease unguaranteed residual asset 215 220
Net discount (6) (7)
Sales-type    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Lease payment receivable 534 510
Sales type lease unguaranteed residual asset $ 16 $ 15