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Credit Quality (Summary of Subsequent Defaults) (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Financing Receivable, Modifications        
Number of contracts [1] 424 389 938 873
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 22 $ 9 $ 35 $ 19
Commercial Portfolio Segment | Commercial and Industrial Loans        
Financing Receivable, Modifications        
Number of contracts [1] 2 2 4 3
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 15 $ 3 $ 16 $ 3
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied        
Financing Receivable, Modifications        
Number of contracts [1] 3   3  
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 1   $ 1  
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied        
Financing Receivable, Modifications        
Number of contracts [1]   1   2
Recorded Investment in Loans Modified in a TDR During the Period [1]   $ 0   $ 0
Residential Mortgage Loans        
Financing Receivable, Modifications        
Number of contracts [1] 26 33 83 86
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 3 $ 5 $ 12 $ 12
Consumer Portfolio Segment | Home Equity        
Financing Receivable, Modifications        
Number of contracts [1] 6 2 11 8
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 1 $ 0 $ 2 $ 1
Consumer Portfolio Segment | Credit Card        
Financing Receivable, Modifications        
Number of contracts [1] 387 351 837 774
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 2 $ 1 $ 4 $ 3
[1]

(a) Excludes all loans and leases held for sale and loans acquired with deteriorated credit quality.