|
Credit Quality Indicators - Commercial Portfolio - Credit Risk Profile by Creditworthiness Category (Detail) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Financing Receivable, Recorded Investment [Line Items] | ||
| Loans | $ 46,629 | $ 43,979 |
|
Commercial
|
||
| Financing Receivable, Recorded Investment [Line Items] | ||
| Loans | 1,417 | 1,280 |
|
Commercial | Investment grade
|
||
| Financing Receivable, Recorded Investment [Line Items] | ||
| Loans | 1,064 | 906 |
|
Commercial | Noninvestment grade
|
||
| Financing Receivable, Recorded Investment [Line Items] | ||
| Loans | 353 | 374 |
|
Commercial Real Estate
|
||
| Financing Receivable, Recorded Investment [Line Items] | ||
| Loans | 1,740 | 1,449 |
|
Commercial Real Estate | Investment grade
|
||
| Financing Receivable, Recorded Investment [Line Items] | ||
| Loans | 1,289 | 1,062 |
|
Commercial Real Estate | Noninvestment grade
|
||
| Financing Receivable, Recorded Investment [Line Items] | ||
| Loans | 451 | 387 |
|
Financial Institutions
|
||
| Financing Receivable, Recorded Investment [Line Items] | ||
| Loans | 11,288 | 11,144 |
|
Financial Institutions | Investment grade
|
||
| Financing Receivable, Recorded Investment [Line Items] | ||
| Loans | 9,935 | 9,643 |
|
Financial Institutions | Noninvestment grade
|
||
| Financing Receivable, Recorded Investment [Line Items] | ||
| Loans | $ 1,353 | $ 1,501 |