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Loans and asset quality- Information about Impaired Loans (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Financing Receivable, Impaired [Line Items]            
Impaired loans with an allowance, average recorded investment $ 81 $ 102 $ 139 $ 90 $ 132  
Impaired loans without an allowance, average recorded investment 23 [1] 13 [1] 8 [1] 18 [1] 8 [1]  
Total impaired loans, average recorded investment 104 115 147 108 140  
Impaired loans with an allowance, interest income recognized 1 1 1 2 2  
Impaired loans without an allowance, interest income recognized 0 [1] 0 [1] 0 [1] 0 [1] 0 [1]  
Total impaired loans, interest income recognized 1 1 1 2 2  
Impaired loans with an allowance, recorded investment 66     66   110
Impaired loans without an allowance, recorded investment 28 [1]     28 [1]   7 [1]
Total impaired loans, recorded investment 94 [2]     94 [2]   117 [2]
Impaired loans with an allowance, unpaid Principal balance 79     79   123
Impaired loans without an allowance, unpaid Principal balance 36 [1]     36 [1]   14 [1]
Total impaired loans, unpaid Principal balance 115 [2]     115 [2]   137 [2]
Impaired loans with an allowance, related allowance 11 [2],[3]     11 [2],[3]   24 [2],[3]
Commercial
           
Financing Receivable, Impaired [Line Items]            
Impaired loans with an allowance, average recorded investment 50 56 64 52 51  
Impaired loans without an allowance, average recorded investment   0 0 3 0  
Impaired loans with an allowance, interest income recognized 1 1 1 2 2  
Impaired loans without an allowance, interest income recognized   0 0 0 0  
Impaired loans with an allowance, recorded investment 45     45   57
Impaired loans without an allowance, recorded investment 9     9   0
Impaired loans with an allowance, unpaid Principal balance 49     49   61
Impaired loans without an allowance, unpaid Principal balance 9     9   0
Impaired loans with an allowance, related allowance 3 [3]     3 [3]   12 [3]
Commercial real estate
           
Financing Receivable, Impaired [Line Items]            
Impaired loans with an allowance, average recorded investment 2 9 31 7 32  
Impaired loans without an allowance, average recorded investment 13 8 3 9 3  
Impaired loans with an allowance, interest income recognized 0 0 0 0 0  
Impaired loans without an allowance, interest income recognized 0 0 0 0 0  
Impaired loans with an allowance, recorded investment 2     2   15
Impaired loans without an allowance, recorded investment 13     13   2
Impaired loans with an allowance, unpaid Principal balance 3     3   16
Impaired loans without an allowance, unpaid Principal balance 13     13   2
Impaired loans with an allowance, related allowance 1 [3]     1 [3]   1 [3]
Financial institutions
           
Financing Receivable, Impaired [Line Items]            
Impaired loans with an allowance, average recorded investment 1 1 6 1 11  
Impaired loans without an allowance, average recorded investment 2 1 2 2 2  
Impaired loans with an allowance, interest income recognized 0 0 0 0 0  
Impaired loans without an allowance, interest income recognized 0 0 0 0 0  
Impaired loans with an allowance, recorded investment 0     0   1
Impaired loans without an allowance, recorded investment 2     2   1
Impaired loans with an allowance, unpaid Principal balance 0     0   1
Impaired loans without an allowance, unpaid Principal balance 9     9   8
Impaired loans with an allowance, related allowance 0     0   0 [3]
Wealth management loans and mortgages
           
Financing Receivable, Impaired [Line Items]            
Impaired loans with an allowance, average recorded investment 19 27 28 21 28  
Impaired loans without an allowance, average recorded investment 4 4 3 4 3  
Impaired loans with an allowance, interest income recognized 0 0 0 0 0  
Impaired loans without an allowance, interest income recognized 0 0 0 0 0  
Impaired loans with an allowance, recorded investment 10     10   28
Impaired loans without an allowance, recorded investment 4     4   4
Impaired loans with an allowance, unpaid Principal balance 10     10   28
Impaired loans without an allowance, unpaid Principal balance 5     5   4
Impaired loans with an allowance, related allowance 3 [3]     3 [3]   7 [3]
Foreign
           
Financing Receivable, Impaired [Line Items]            
Impaired loans with an allowance, average recorded investment 9 9 10 9 10  
Impaired loans with an allowance, interest income recognized 0 0 0 0 0  
Impaired loans with an allowance, recorded investment 9     9   9
Impaired loans with an allowance, unpaid Principal balance 17     17   17
Impaired loans with an allowance, related allowance $ 4 [3]     $ 4 [3]   $ 4 [3]
[1] When the discounted cash flows, collateral value or market price equals or exceeds the carrying value of the loan, then the loan does not require an allowance under the accounting standard related to impaired loans.
[2] Excludes an aggregate of $1 million and $2 million of impaired loans in amounts individually less than $1 million at June 30, 2013 and Dec. 31, 2012, respectively. The allowance for loan loss associated with these loans totaled less than $1 million at both June 30, 2013 and Dec. 31, 2012.
[3] The allowance for impaired loans is included in the allowance for loan losses.