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Mortgage Servicing Rights (Narrative) (Details) (USD $)
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3 Months Ended | ||
|---|---|---|---|
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Mar. 31, 2014
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Mar. 31, 2013
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Dec. 31, 2013
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| Mortgage Servicing Rights Disclosure [Abstract] | |||
| Residential mortgage loans serviced for third parties | $ 3,100,000,000 | $ 3,100,000,000 | |
| Servicing income, including late and ancillary fees | $ 2,000,000 | $ 2,000,000 | |