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Loans and asset quality- Allowance for Credit Losses Activity (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning balance $ 387 $ 456 $ 497
Charge-offs (5) (10) (10)
Recoveries 0 2 2
Net (charge-offs) recoveries (5) (8) (8)
Provision (24) (61) 5
Ending balance 358 387 494
Allowance for loans losses 237 266 386
Allowance for unfunded commitments 121 121 108
Individually evaluated for impairment, loan balance 113 117 159
Individually evaluated for impairment, allowance for loan losses 20 24 38
Collectively evaluated for impairment, loan balance 49,111 46,512 42,869
Collectively evaluated for impairment, allowance for loan losses 217 242 348
Commercial
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning balance 104 98 91
Charge-offs (2) 0 0
Recoveries 0 0 0
Net (charge-offs) recoveries (2) 0 0
Provision (5) 6 6
Ending balance 97 104 97
Allowance for loans losses 22 30 36
Allowance for unfunded commitments 75 74 61
Individually evaluated for impairment, loan balance 54 57 66
Individually evaluated for impairment, allowance for loan losses 7 12 17
Collectively evaluated for impairment, loan balance 1,297 1,249 697
Collectively evaluated for impairment, allowance for loan losses 15 18 19
Commercial real estate
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning balance 30 35 34
Charge-offs 0 0 0
Recoveries 0 0 0
Net (charge-offs) recoveries 0 0 0
Provision 1 (5) (1)
Ending balance 31 30 33
Allowance for loans losses 19 20 22
Allowance for unfunded commitments 12 10 11
Individually evaluated for impairment, loan balance 16 17 38
Individually evaluated for impairment, allowance for loan losses 1 1 6
Collectively evaluated for impairment, loan balance 1,806 1,660 1,403
Collectively evaluated for impairment, allowance for loan losses 18 19 16
Financial institutions
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning balance 36 37 63
Charge-offs 0 (5) 0
Recoveries 0 0 0
Net (charge-offs) recoveries 0 (5) 0
Provision (3) 4 (10)
Ending balance 33 36 53
Allowance for loans losses 11 12 30
Allowance for unfunded commitments 22 24 23
Individually evaluated for impairment, loan balance 3 3 14
Individually evaluated for impairment, allowance for loan losses 0 0 5
Collectively evaluated for impairment, loan balance 4,917 5,452 4,881
Collectively evaluated for impairment, allowance for loan losses 11 12 25
Lease financings
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning balance 49 55 66
Charge-offs 0 0 0
Recoveries 0 0 0
Net (charge-offs) recoveries 0 0 0
Provision (10) (6) (4)
Ending balance 39 49 62
Allowance for loans losses 39 49 62
Allowance for unfunded commitments 0 0 0
Individually evaluated for impairment, loan balance 0 0 0
Individually evaluated for impairment, allowance for loan losses 0 0 0
Collectively evaluated for impairment, loan balance 1,295 1,329 1,518
Collectively evaluated for impairment, allowance for loan losses 39 49 62
Wealth management loans and mortgages
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning balance 30 33 29
Charge-offs 0 (1) 0
Recoveries 0 1 0
Net (charge-offs) recoveries 0 0 0
Provision (1) (3) 5
Ending balance 29 30 34
Allowance for loans losses 25 26 29
Allowance for unfunded commitments 4 4 5
Individually evaluated for impairment, loan balance 31 31 31
Individually evaluated for impairment, allowance for loan losses 7 7 7
Collectively evaluated for impairment, loan balance 8,888 8,765 7,281
Collectively evaluated for impairment, allowance for loan losses 18 19 22
Other residential mortgages
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning balance 88 141 156
Charge-offs (3) (4) (10)
Recoveries 0 1 2
Net (charge-offs) recoveries (3) (3) (8)
Provision (4) (50) 17
Ending balance 81 88 165
Allowance for loans losses 81 88 165
Allowance for unfunded commitments 0 0 0
Individually evaluated for impairment, loan balance 0 0 0
Individually evaluated for impairment, allowance for loan losses 0 0 0
Collectively evaluated for impairment, loan balance 1,570 1,632 1,854
Collectively evaluated for impairment, allowance for loan losses 81 88 165
All Other
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning balance 2 2 0
Charge-offs 0 0 0
Recoveries 0 0 0
Net (charge-offs) recoveries 0 0 0
Provision 0 0 0
Ending balance 2 2 0
Allowance for loans losses 2 2 0
Allowance for unfunded commitments 0 0 0
Individually evaluated for impairment, loan balance 0 0 0
Individually evaluated for impairment, allowance for loan losses 0 0 0
Collectively evaluated for impairment, loan balance 16,658 [1] 16,264 [2] 15,964
Collectively evaluated for impairment, allowance for loan losses 2 2 0
Foreign
      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning balance 48 55 58
Charge-offs 0 0 0
Recoveries 0 0 0
Net (charge-offs) recoveries 0 0 0
Provision (2) (7) (8)
Ending balance 46 48 50
Allowance for loans losses 38 39 42
Allowance for unfunded commitments 8 9 8
Individually evaluated for impairment, loan balance 9 9 10
Individually evaluated for impairment, allowance for loan losses 5 4 3
Collectively evaluated for impairment, loan balance 12,680 10,161 9,271
Collectively evaluated for impairment, allowance for loan losses $ 33 $ 35 $ 39
[1] Includes $2,772 million of domestic overdrafts, $13,242 million of margin loans and $644 million of other loans at March 31, 2013.
[2] Includes $2,228 million of domestic overdrafts, $13,397 million of margin loans and $639 million of other loans at Dec. 31, 2012.