Derivative Financial Instruments (Fair Value And Related Number Of Derivative Contracts Categorized By Predominant Risk Exposure) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Derivatives, Fair Value [Line Items]
Fair Value, Assets	$ 2,232,426
Fair Value, Liabilities	2,415,343
Counterparty/cash-collateral netting, Assets	(2,039,660)	[1]
Counterparty/cash-collateral netting, Liabilities	(2,215,626)	[1]
Total Derivative Assets per Consolidated Statement of Financial Condition	192,766
Total Derivative Liabilities per Consolidated Statement of Financial Condition	199,717
Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Assets	808,242
Number of Contracts, Assets	33,820
Fair Value, Liabilities	895,260
Number of Contracts, Liabilities	54,324
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Assets	635,106
Number of Contracts, Assets	127,740
Fair Value, Liabilities	695,458
Number of Contracts, Liabilities	113,516
Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Assets	598,779
Number of Contracts, Assets	1,738,780
Fair Value, Liabilities	623,633
Number of Contracts, Liabilities	2,873,446
Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Assets	143,570
Number of Contracts, Assets	679,472
Fair Value, Liabilities	143,134
Number of Contracts, Liabilities	681,988
Credit Contracts: Centrally Cleared Swaps [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Assets	35,902
Number of Contracts, Assets	62
Fair Value, Liabilities	39,145
Number of Contracts, Liabilities	52
Credit Contracts: Other Credit Derivatives [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Assets	10,827
Number of Contracts, Assets	29
Fair Value, Liabilities	$ 18,713
Number of Contracts, Liabilities	37

[1] Netting is applied by counterparty when a legal right of offset exists under an enforceable master netting agreement, as permitted under GAAP. Further, for derivative assets and liabilities, netting is inclusive of cash paid or received as collateral under credit support agreements pursuant to the master netting agreement.