Litigation And Related Contingencies (Details) (USD $)	35 Months Ended
	Nov. 30, 2007	Jul. 31, 2014	Apr. 30, 2014	Jul. 31, 2013	Apr. 05, 2013 loan	Jul. 31, 2014 ederal Home Loan Bank of Chicago v. Bank of America Funding Corporation, et al [Member] Pending Litigation [Member]	Oct. 15, 2010 ederal Home Loan Bank of Chicago v. Bank of America Funding Corporation, et al [Member] Pending Litigation [Member]	Apr. 30, 2014 MGRID LLC v. Merrill Lynch Mortgage Lending Inc [Member] lawsuit	Apr. 30, 2014 MGRID LLC v. Merrill Lynch Mortgage Lending Inc [Member] SCC [Member]	Apr. 30, 2014 MGRID LLC v. Merrill Lynch Mortgage Lending Inc [Member] SCC [Member] Claims with Knowledge of Outstanding Principal Amount [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual		$ 23,700,000	$ 23,700,000	$ 12,500,000
Initial principal on loans securitized							50,000,000
Principal outstanding on loans securitized						35,000,000
Loans Sold To Trust, With Claims of Breach of Contract and Indemnity					159
Number Of Lawsuits								18
Securitization Transactions	38
Estimated Litigation Liability									$ 14,000,000,000	$ 4,000,000,000