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Summary of Subsequent Defaults (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Financing Receivable, Modifications [Line Items]        
Number of contracts [1]     1,235 986
Recorded Investment in Loans Modified in a TDR During the Period [1]     $ 22 $ 42
Quarter to date        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1] 598 418    
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 14 $ 16    
Residential Mortgage Loans        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1]     70 81
Recorded Investment in Loans Modified in a TDR During the Period [1]     $ 9 $ 12
Residential Mortgage Loans | Quarter to date        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1] 30 40    
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 4 $ 6    
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 and Industrial Loans | Quarter to date        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1] 4 3    
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 7 $ 6    
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1]       2
Recorded Investment in Loans Modified in a TDR During the Period [1]       $ 3
Consumer Portfolio Segment | Home Equity        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1]     8 20
Recorded Investment in Loans Modified in a TDR During the Period [1]       $ 1
Consumer Portfolio Segment | Home Equity | Quarter to date        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1] 3 10    
Recorded Investment in Loans Modified in a TDR During the Period [1]   $ 1    
Consumer Portfolio Segment | Automobile Loans        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1]     8 4
Consumer Portfolio Segment | Automobile Loans | Quarter to date        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1] 4 2    
Consumer Portfolio Segment | Credit Card        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1]     1,145 870
Recorded Investment in Loans Modified in a TDR During the Period [1]     $ 6 $ 6
Consumer Portfolio Segment | Credit Card | Quarter to date        
Financing Receivable, Modifications [Line Items]        
Number of contracts [1] 557 363    
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 3 $ 3    
[1] Excludes all loans and leases held for sale and loans acquired with deteriorated credit quality.