Legal Proceedings (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014
Federal Home Loan Bank of Chicago V Bank of America Funding Corp [Member]
Loss Contingencies [Line Items]
Mortgagebacked Securities Amount Addressed In Litigation	$ 3,300
Federal Home Loan Bank of Chicago V Bank of America Funding Corp [Member] | National City Corporation [Member]
Loss Contingencies [Line Items]
Mortgagebacked Securities Amount Addressed In Litigation	345
Jo Ann Howard Pc Et Al V Cassity Et Al [Member]
Loss Contingencies [Line Items]
Alleged Present And Future Losses	600
Legal Reserve [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Loss contingency, range of possible loss not accrued	$ 725