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Commercial Mortgage Residual Interests (Narrative And Schedule Of Key Assumptions Used In Determining The Value Of The Residuals) (Details) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Mortgage Loans On Real Estate [Line Items] |  |
Discount rate | 25.00% | 25.00%
Loss severity of loans in foreclosure | 20.00% | 20.00%
LIBOR | Forward 3-month curve | Forward 3-month curve
Prime | Forward curve | Forward curve
Maximum [Member] |  |
Mortgage Loans On Real Estate [Line Items] |  |
Average Life Equivalent CPR Speeds Range | 24.31% | 18.57%
Foreclosures Frequency Curve Default Model | 4.49% | 4.70%
Minimum [Member] |  |
Mortgage Loans On Real Estate [Line Items] |  |
Average Life Equivalent CPR Speeds Range | 0.80% | 2.18%
Foreclosures Frequency Curve Default Model | 0.10% | 0.20%

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- Definition Average Life Equivalent CPR Speeds Range Assumption + References No definition available. + Details
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- Definition Discount Rate Valuation Adjustment Assumption + References No definition available. + Details
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- Definition Foreclosures Frequency Curve Default Model Assumption + References No definition available. + Details
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- Definition Libor Yield Assumption + References No definition available. + Details
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- Definition Loss Severity of Loans in Foreclosure Assumption + References No definition available. + Details
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- Definition Yield Prime Assumption + References No definition available. + Details
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- Details
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