Fair Value Disclosures (Summary Of Trading Assets And Trading Liabilities) (Details)	Jun. 30, 2013
Trading Assets and Trading Liabilities Measured Using Different Valuation Basis [Line Items]
Trading assets	100.00%
Trading liabilities	100.00%
Exchange Closing Prices [Member]
Trading Assets and Trading Liabilities Measured Using Different Valuation Basis [Line Items]
Trading assets	12.00%
Trading liabilities	24.00%
Recently Observed Transaction Prices [Member]
Trading Assets and Trading Liabilities Measured Using Different Valuation Basis [Line Items]
Trading assets	9.00%
Trading liabilities	15.00%
External Pricing Services [Member]
Trading Assets and Trading Liabilities Measured Using Different Valuation Basis [Line Items]
Trading assets	66.00%
Trading liabilities	56.00%
Broker Quotes [Member]
Trading Assets and Trading Liabilities Measured Using Different Valuation Basis [Line Items]
Trading assets	2.00%
Trading liabilities	1.00%
Valuation Techniques [Member]
Trading Assets and Trading Liabilities Measured Using Different Valuation Basis [Line Items]
Trading assets	11.00%
Trading liabilities	4.00%