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Mortgage Banking Activities, Managed Servicing Portfolio Components (Details) (USD $)
In Billions, unless otherwise specified |
Mar. 31, 2013
|
Dec. 31, 2012
|
|---|---|---|
| Components of Managed Servicing Portfolio [Abstract] | ||
| Serviced for others | $ 1,890 | $ 1,906 |
| Total managed servicing portfolio | 2,384 | 2,400 |
| Ratio of MSRs to related loans serviced for others | 0.70% | 0.67% |
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Commercial Mortgage Servicing [Member]
|
||
| Components of Managed Servicing Portfolio [Abstract] | ||
| Serviced for others | 404 | 408 |
| Owned loans serviced | 106 | 106 |
| Subservicing | 14 | 13 |
| Total managed servicing portfolio | 524 | 527 |
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Residential Mortgage Servicing [Member]
|
||
| Components of Managed Servicing Portfolio [Abstract] | ||
| Serviced for others | 1,486 | 1,498 |
| Owned loans serviced | 367 | 368 |
| Subservicing | 7 | 7 |
| Total managed servicing portfolio | $ 1,860 | $ 1,873 |