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Credit Quality (Summary of Subsequent Defaults) (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Financing Receivable, Modifications        
Number of contracts [1] 389 598 873 1,235
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 9,000,000 $ 14,000,000 $ 19,000,000 $ 22,000,000
Commercial Portfolio Segment | Commercial and Industrial Loans        
Financing Receivable, Modifications        
Number of contracts [1] 2 4 3 4
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 3,000,000 $ 7,000,000 $ 3,000,000 $ 7,000,000
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied        
Financing Receivable, Modifications        
Number of contracts [1] 1   2  
Residential Mortgage Loans        
Financing Receivable, Modifications        
Number of contracts [1] 33 30 86 70
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 5,000,000 $ 4,000,000 $ 12,000,000 $ 9,000,000
Consumer Portfolio Segment | Home Equity        
Financing Receivable, Modifications        
Number of contracts [1] 2 3 8 8
Recorded Investment in Loans Modified in a TDR During the Period [1]     $ 1,000,000  
Consumer Portfolio Segment | Automobile Loans        
Financing Receivable, Modifications        
Number of contracts [1]   4   8
Consumer Portfolio Segment | Credit Card        
Financing Receivable, Modifications        
Number of contracts [1] 351 557 774 1,145
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 1,000,000 $ 3,000,000 $ 3,000,000 $ 6,000,000
[1] (a) Excludes all loans and leases held for sale and loans acquired with deteriorated credit quality.