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Summary of Subsequent Defaults (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Financing Receivable, Modifications [Line Items]        
Number of contracts [1]     1,410 1,480
Recorded Investment in Loans Modified in a TDR During the Period [1]     $ 28 $ 58
Quarter to date        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1] 175 494    
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 5 $ 16    
Commercial Portfolio Segment | Commercial and Industrial Loans        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1]     4 9
Recorded Investment in Loans Modified in a TDR During the Period [1]     $ 7 $ 20
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1]       3
Recorded Investment in Loans Modified in a TDR During the Period [1]       $ 4
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied | Quarter to date        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1]   1    
Recorded Investment in Loans Modified in a TDR During the Period [1]   $ 1    
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1]       2
Recorded Investment in Loans Modified in a TDR During the Period [1]       $ 1
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied | Quarter to date        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1]   2    
Recorded Investment in Loans Modified in a TDR During the Period [1]   $ 1    
Residential Mortgage Loans        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1]     101 181
Recorded Investment in Loans Modified in a TDR During the Period [1]     $ 14 $ 24
Residential Mortgage Loans | Quarter to date        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1] 31 100    
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 5 $ 12    
Consumer Portfolio Segment | Home Equity        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1]     12 24
Recorded Investment in Loans Modified in a TDR During the Period [1]     $ 1 $ 1
Consumer Portfolio Segment | Home Equity | Quarter to date        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1] 4 4    
Consumer Portfolio Segment | Automobile Loans        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1]     8 6
Consumer Portfolio Segment | Automobile Loans | Quarter to date        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1]   2    
Consumer Portfolio Segment | Credit Card        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1]     1,285 1,255
Recorded Investment in Loans Modified in a TDR During the Period [1]     $ 6 $ 8
Consumer Portfolio Segment | Credit Card | Quarter to date        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1] 140 385    
Recorded Investment in Loans Modified in a TDR During the Period [1]   $ 2    
[1] Excludes all loans and leases held for sale and loans acquired with deteriorated credit quality.