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Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Detail) (USD $)
In Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements $ 1,276 $ 1,207 $ 1,276 $ 1,207
Total Gain (Losses) (259) (401) (451) (716)
Fair Value, Inputs, Level 3 | Loans Held-for-Sale
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements 17 [1] 26 [1] 17 [1] 26 [1]
Loans Held-for-Sale
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements 17 [1] 26 [1] 17 [1] 26 [1]
Total Gain (Losses) (9) [1] (9) [1] (25) [1] (15) [1]
Fair Value, Inputs, Level 1 | Commercial and Industrial Loans
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements   10   10
Fair Value, Inputs, Level 3 | Commercial and Industrial Loans
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements 115 96 115 96
Commercial and Industrial Loans
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements 115 106 115 106
Total Gain (Losses) (114) (125) (199) (261)
Fair Value, Inputs, Level 1 | Commercial Mortgage Loans
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements   13   13
Fair Value, Inputs, Level 3 | Commercial Mortgage Loans
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements 109 130 109 130
Commercial Mortgage Loans
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements 109 143 109 143
Total Gain (Losses) (22) (67) (53) (132)
Fair Value, Inputs, Level 1 | Commercial Construction
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements   6   6
Fair Value, Inputs, Level 3 | Commercial Construction
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements 35 80 35 80
Commercial Construction
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements 35 86 35 86
Total Gain (Losses) (19) (55) (38) (108)
Fair Value, Inputs, Level 3 | Mortgage Servicing Rights
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements 847 646 847 646
Mortgage Servicing Rights
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements 847 646 847 646
Total Gain (Losses) (63) (100) (27) (106)
Fair Value, Inputs, Level 3 | Other Real Estate Owned
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements 153 200 153 200
Other Real Estate Owned
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements 153 200 153 200
Total Gain (Losses) (32) (45) (109) (94)
Fair Value, Inputs, Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements   29   29
Fair Value, Inputs, Level 3
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Measurements $ 1,276 $ 1,178 $ 1,276 $ 1,178
[1] Includes commercial nonaccrual loans held for sale.