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Summary of Subsequent Defaults (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Jun. 30, 2012
Financing Receivable, Modifications    
Number of contracts 1,195 [1] 1,210 [1]
Recorded Investment in Loans Modified in a TDR During the Period $ 46 [1] $ 40 [1]
Quarter to date
    
Financing Receivable, Modifications    
Number of contracts 491 [1] 523 [1]
Recorded Investment in Loans Modified in a TDR During the Period 12 [1] 19 [1]
Commercial Portfolio Segment | Commercial and Industrial Loans
    
Financing Receivable, Modifications    
Number of contracts 2 [1]  
Commercial Portfolio Segment | Commercial and Industrial Loans | Quarter to date
    
Financing Receivable, Modifications    
Number of contracts 1 [1]  
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
    
Financing Receivable, Modifications    
Number of contracts 4 [1] 2 [1]
Recorded Investment in Loans Modified in a TDR During the Period 1 [1] 1 [1]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied | Quarter to date
    
Financing Receivable, Modifications    
Number of contracts 4 [1] 2 [1]
Recorded Investment in Loans Modified in a TDR During the Period 1 [1] 1 [1]
Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
    
Financing Receivable, Modifications    
Number of contracts   2 [1]
Recorded Investment in Loans Modified in a TDR During the Period   1 [1]
Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied | Quarter to date
    
Financing Receivable, Modifications    
Number of contracts   1 [1]
Commercial Portfolio Segment | Commercial Construction
    
Financing Receivable, Modifications    
Number of contracts   2 [1]
Recorded Investment in Loans Modified in a TDR During the Period   3 [1]
Consumer Portfolio Segment | Home Equity
    
Financing Receivable, Modifications    
Number of contracts 34 [1] 48 [1]
Recorded Investment in Loans Modified in a TDR During the Period 2 [1] 3 [1]
Consumer Portfolio Segment | Home Equity | Quarter to date
    
Financing Receivable, Modifications    
Number of contracts 20 [1] 17 [1]
Recorded Investment in Loans Modified in a TDR During the Period 1 [1] 1 [1]
Consumer Portfolio Segment | Automobile Loans
    
Financing Receivable, Modifications    
Number of contracts 3 [1] 21 [1]
Consumer Portfolio Segment | Automobile Loans | Quarter to date
    
Financing Receivable, Modifications    
Number of contracts   9 [1]
Consumer Portfolio Segment | Credit Card
    
Financing Receivable, Modifications    
Number of contracts 926 [1] 1,009 [1]
Recorded Investment in Loans Modified in a TDR During the Period 6 [1] 7 [1]
Consumer Portfolio Segment | Credit Card | Quarter to date
    
Financing Receivable, Modifications    
Number of contracts 411 [1] 432 [1]
Recorded Investment in Loans Modified in a TDR During the Period 2 [1] 3 [1]
Residential Mortgage Loans
    
Financing Receivable, Modifications    
Number of contracts 226 [1] 126 [1]
Recorded Investment in Loans Modified in a TDR During the Period 37 [1] 25 [1]
Residential Mortgage Loans | Quarter to date
    
Financing Receivable, Modifications    
Number of contracts 55 [1] 62 [1]
Recorded Investment in Loans Modified in a TDR During the Period $ 8 [1] $ 14 [1]
[1]  Excludes all loans and leases held for sale and loans acquired with deteriorated credit quality.