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Mortgage Banking Activities, Managed Servicing Portfolio Components (Details) (USD $)
In Billions, unless otherwise specified |
Jun. 30, 2013
|
Dec. 31, 2012
|
|---|---|---|
| Components of Managed Servicing Portfolio [Abstract] | ||
| Serviced for others | $ 1,896 | $ 1,906 |
| Total managed servicing portfolio | 2,376 | 2,400 |
| Ratio of MSRs to related loans serviced for others | 0.81% | 0.67% |
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Commercial Mortgage Servicing [Member]
|
||
| Components of Managed Servicing Portfolio [Abstract] | ||
| Serviced for others | 409 | 408 |
| Owned loans serviced | 105 | 106 |
| Subservicing | 11 | 13 |
| Total managed servicing portfolio | 525 | 527 |
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Residential Mortgage Servicing [Member]
|
||
| Components of Managed Servicing Portfolio [Abstract] | ||
| Serviced for others | 1,487 | 1,498 |
| Owned loans serviced | 358 | 368 |
| Subservicing | 6 | 7 |
| Total managed servicing portfolio | $ 1,851 | $ 1,873 |