Commercial Mortgage Residual Interests (Narrative And Schedule Of Key Assumptions Used In Determining The Value Of The Residuals) (Details)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Mortgage Loans On Real Estate [Line Items]
Discount rate	20.00%		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
Mortgage Loans On Real Estate [Line Items]
Average Life Equivalent CPR Speeds Range	20.76%	[1]	24.31%	[1]
Foreclosures Frequency Curve Default Model	2.43%		4.49%
Minimum
Mortgage Loans On Real Estate [Line Items]
Average Life Equivalent CPR Speeds Range	0.80%	[1]	0.80%	[1]
Foreclosures Frequency Curve Default Model	0.07%		0.09%

[1] Conditional prepayment rate