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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, 2014
Mar. 31, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]            
Impaired loans with an allowance, average recorded investment $ 29 $ 32 $ 81 $ 30 $ 90  
Impaired loans without an allowance, average recorded investment 3 [1] 3 [1] 23 [1] 3 [1] 18 [1]  
Total impaired loans, average recorded investment 32 35 104 33 108  
Impaired loans with an allowance, interest income recognized 0 0 1 0 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 0 0 1 0 2  
Impaired loans with an allowance, recorded investment 27     27   32
Impaired loans without an allowance, recorded investment 3 [1]     3 [1]   4 [1]
Total impaired loans, recorded investment 30 [2]     30 [2]   36 [2]
Impaired loans with an allowance, unpaid Principal balance 29     29   50
Impaired loans without an allowance, unpaid Principal balance 3 [1]     3 [1]   4 [1]
Total impaired loans, unpaid Principal balance 32 [2]     32 [2]   54 [2]
Impaired loans with an allowance, related allowance 7 [2],[3]     7 [2],[3]   7 [2],[3]
Commercial
           
Financing Receivable, Impaired [Line Items]            
Impaired loans with an allowance, average recorded investment 13 14 50 14 52  
Impaired loans without an allowance, average recorded investment 0 0 4 0 3  
Impaired loans with an allowance, interest income recognized 0 0 1 0 2  
Impaired loans without an allowance, interest income recognized 0 0 0 0 0  
Impaired loans with an allowance, recorded investment 13     13   15
Impaired loans with an allowance, unpaid Principal balance 13     13   20
Impaired loans with an allowance, related allowance 3 [3]     3 [3]   2 [3]
Commercial real estate
           
Financing Receivable, Impaired [Line Items]            
Impaired loans with an allowance, average recorded investment 2 3 2 2 7  
Impaired loans without an allowance, average recorded investment 1 1 13 1 9  
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   2
Impaired loans without an allowance, recorded investment 1     1   1
Impaired loans with an allowance, unpaid Principal balance 3     3   4
Impaired loans without an allowance, unpaid Principal balance 1     1   1
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 0 0 1 0 1  
Impaired loans without an allowance, average recorded investment 0 0 2 0 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   0
Impaired loans with an allowance, unpaid Principal balance 0     0   0
Impaired loans with an allowance, related allowance 0 [3]     0 [3]   0 [3]
Wealth management loans and mortgages
           
Financing Receivable, Impaired [Line Items]            
Impaired loans with an allowance, average recorded investment 8 9 19 8 21  
Impaired loans without an allowance, average recorded investment 2 2 4 2 4  
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 7     7   9
Impaired loans without an allowance, recorded investment 2     2   3
Impaired loans with an allowance, unpaid Principal balance 8     8   9
Impaired loans without an allowance, unpaid Principal balance 2     2   3
Impaired loans with an allowance, related allowance 2 [3]     2 [3]   3 [3]
Foreign
           
Financing Receivable, Impaired [Line Items]            
Impaired loans with an allowance, average recorded investment 6 6 9 6 9  
Impaired loans with an allowance, interest income recognized 0 0 0 0 0  
Impaired loans with an allowance, recorded investment 5     5   6
Impaired loans with an allowance, unpaid Principal balance 5     5   17
Impaired loans with an allowance, related allowance $ 1 [3]     $ 1 [3]   $ 1 [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 less than $1 million of impaired loans in amounts individually less than $1 million at both June 30, 2014 and Dec. 31, 2013. The allowance for loan loss associated with these loans totaled less than $1 million at both June 30, 2014 and Dec. 31, 2013.
[3] The allowance for impaired loans is included in the allowance for loan losses.