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Loans & Leases (Loans and Leases - Additional Information) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Schedule Of Accounts Notes Loans And Financing Receivable [Table][Abstract]    
Unamortized premiums and discounts, deferred loan fees and costs, and fair value adjustments $ 282 $ 240
Unearned Income 523 503
Loans pledged at the FHLB 13,000 13,100
Loans pledged at the FRB 39,800 40,000
Direct Financing Leases 3,400 3,300
Leveraged leases 674 701
Leveraged leases, pre-tax income (loss) 11 38
Gain On Early Termination Of Leverage Leases   16
Leveraged leases, tax expense (benefit) 6 10
Minimum future lease payments receivable - 2018 865  
Minimum future lease payments receivable - 2019 814  
Minimum future lease payments receivable - 2020 625  
Minimum future lease payments receivable - 2021 463  
Minimum future lease payments receivable - 2022 414  
Residual value write-downs related to commercial leases 4 $ 1
Remeasurement of leveraged leases 27  
Leveraged leases, pre-tax income (loss), excluding remeasurement $ 16