Loans and asset quality- Allowance for Credit Losses Activity (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2013
|
Mar. 31, 2013
|
Dec. 31, 2012
|
Jun. 30, 2012
|
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Financing Receivable, Allowance for Credit Losses [Line Items] | ||||
Loans | $ 50,307 | $ 46,629 | ||
Domestic
|
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Financing Receivable, Allowance for Credit Losses [Line Items] | ||||
Loans | 36,362 | 36,459 | ||
Overdrafts
|
||||
Financing Receivable, Allowance for Credit Losses [Line Items] | ||||
Loans | 5,526 | 5,298 | ||
Overdrafts | Domestic
|
||||
Financing Receivable, Allowance for Credit Losses [Line Items] | ||||
Loans | 1,762 | 2,772 | 2,228 | 2,750 |
Margin loans
|
||||
Financing Receivable, Allowance for Credit Losses [Line Items] | ||||
Loans | 14,434 | 13,397 | ||
Margin loans | Domestic
|
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Financing Receivable, Allowance for Credit Losses [Line Items] | ||||
Loans | 14,434 | 13,242 | 13,397 | 13,462 |
Other | Domestic
|
||||
Financing Receivable, Allowance for Credit Losses [Line Items] | ||||
Loans | $ 657 | $ 644 | $ 639 | $ 599 |