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Allowance for Credit Losses Activity (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning balance $ 494 $ 497 $ 554 $ 497 $ 571
Charge-offs (11) (10) (21) (20) (40)
Recoveries 3 2 2 4 4
Net (charge-offs) recoveries (8) (8) (19) (16) (36)
Provision (19) 5   (14)  
Ending balance 467 494 535 467 535
Allowance for loans losses 362 386 441 362 441
Allowance for unfunded commitments 105 108 94 105 94
Individually evaluated for impairment, loan balance 134 159 103 134 103
Individually evaluated for impairment, allowance for loan losses 34 38 27 34 27
Collectively evaluated for impairment, loan balance 45,297 42,869 42,044 45,297 42,044
Collectively evaluated for impairment, allowance for loan losses 328 348 414 328 414
Commercial
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning balance 97 91 100 91 93
Charge-offs     (4)   (4)
Recoveries 1   1 1 2
Net (charge-offs) recoveries 1   (3) 1 (2)
Provision 5 6 (1) 11 5
Ending balance 103 97 96 103 96
Allowance for loans losses 42 36 42 42 42
Allowance for unfunded commitments 61 61 54 61 54
Individually evaluated for impairment, loan balance 62 66 31 62 31
Individually evaluated for impairment, allowance for loan losses 16 17 13 16 13
Collectively evaluated for impairment, loan balance 752 697 823 752 823
Collectively evaluated for impairment, allowance for loan losses 26 19 29 26 29
Commercial Real Estate
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning balance   34 34 34 40
Charge-offs     (1)   (4)
Net (charge-offs) recoveries     (1)   (4)
Provision   (1) (6) (1) (9)
Ending balance 33 33 27 33 27
Allowance for loans losses 23 22 21 23 21
Allowance for unfunded commitments 10 11 6 10 6
Individually evaluated for impairment, loan balance 29 38 28 29 28
Individually evaluated for impairment, allowance for loan losses 6 6 3 6 3
Collectively evaluated for impairment, loan balance 1,566 1,403 1,443 1,566 1,443
Collectively evaluated for impairment, allowance for loan losses 17 16 18 17 18
Financial Institutions
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning balance 53 63 17 63 11
Charge-offs (4)   (1) (4) (1)
Recoveries     1   2
Net (charge-offs) recoveries (4)     (4) 1
Provision (10) (10) 7 (20) 12
Ending balance 39 53 24 39 24
Allowance for loans losses 18 30 4 18 4
Allowance for unfunded commitments 21 23 20 21 20
Individually evaluated for impairment, loan balance 3 14 3 3 3
Individually evaluated for impairment, allowance for loan losses   5      
Collectively evaluated for impairment, loan balance 4,832 4,881 5,506 4,832 5,506
Collectively evaluated for impairment, allowance for loan losses 18 25 4 18 4
Lease Financings
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning balance 62 66 93 66 90
Provision (6) (4) (2) (10) 1
Ending balance 56 62 91 56 91
Allowance for loans losses 56 62 91 56 91
Collectively evaluated for impairment, loan balance 1,505 1,518 1,562 1,505 1,562
Collectively evaluated for impairment, allowance for loan losses 56 62 91 56 91
Wealth Management Loans and Mortgages
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning balance 34 29 29 29 41
Provision (8) 5 2 (3) (10)
Ending balance 26 34 31 26 31
Allowance for loans losses 21 29 25 21 25
Allowance for unfunded commitments 5 5 6 5 6
Individually evaluated for impairment, loan balance 31 31 28 31 28
Individually evaluated for impairment, allowance for loan losses 7 7 5 7 5
Collectively evaluated for impairment, loan balance 7,885 7,281 6,790 7,885 6,790
Collectively evaluated for impairment, allowance for loan losses 14 22 20 14 20
Other Residential Mortgages
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning balance 165 156 213 156 235
Charge-offs (7) (10) (9) (16) (25)
Recoveries 2 2   3  
Net (charge-offs) recoveries (5) (8) (9) (13) (25)
Provision (7) 17 (4) 10 (10)
Ending balance 153 165 200 153 200
Allowance for loans losses 153 165 200 153 200
Collectively evaluated for impairment, loan balance 1,773 1,854 2,080 1,773 2,080
Collectively evaluated for impairment, allowance for loan losses 153 165 200 153 200
All Other
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning balance     2 [1]   1
Provision     (2) [1]   (1)
Collectively evaluated for impairment, loan balance 16,811 [2] 15,964 [3] 14,746 [1] 16,811 [2] 14,746 [1]
Foreign
          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Beginning balance 50 58 66 58 60
Charge-offs     (6)   (6)
Net (charge-offs) recoveries     (6)   (6)
Provision 7 (8) 6 (1) 12
Ending balance 57 50 66 57 66
Allowance for loans losses 49 42 58 49 58
Allowance for unfunded commitments 8 8 8 8 8
Individually evaluated for impairment, loan balance 9 10 13 9 13
Individually evaluated for impairment, allowance for loan losses 5 3 6 5 6
Collectively evaluated for impairment, loan balance 10,173 9,271 9,094 10,173 9,094
Collectively evaluated for impairment, allowance for loan losses $ 44 $ 39 $ 52 $ 44 $ 52
[1] Includes $4,629 million of domestic overdrafts, $9,520 million of margin loans and $597 million of other loans at June 30, 2011.
[2] Includes $2,750 million of domestic overdrafts, $13,462 million of margin loans and $599 million of other loans at June 30, 2012.
[3] Includes $1,971 million of domestic overdrafts, $13,144 million of margin loans and $849 million of other loans at March 31, 2012.