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Mortgage Banking Activities, Managed Servicing Portfolio Components (Details) (USD $)
In Billions, unless otherwise specified |
Dec. 31, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Components of Managed Servicing Portfolio [Abstract] | ||
| Serviced for others | $ 1,906 | $ 1,854 |
| Total managed servicing portfolio | 2,400 | 2,340 |
| Ratio of MSRs to related loans serviced for others | 0.67% | 0.76% |
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Commercial Mortgage Servicing [Member]
|
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| Components of Managed Servicing Portfolio [Abstract] | ||
| Serviced for others | 408 | 398 |
| Owned loans serviced | 106 | 106 |
| Subservicing | 13 | 14 |
| Total managed servicing portfolio | 527 | 518 |
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Residential Mortgage Servicing [Member]
|
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| Components of Managed Servicing Portfolio [Abstract] | ||
| Serviced for others | 1,498 | 1,456 |
| Owned loans serviced | 368 | 358 |
| Subservicing | 7 | 8 |
| Total managed servicing portfolio | $ 1,873 | $ 1,822 |