Commitments and Guarantees (Schedule Of Repurchase Agreements) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Aggregate fair value of indemnified securities financing	$ 346,789	$ 320,078
Aggregate fair value of cash and securities held by us, as agent, as collateral for indemnified securities financing	358,240	331,732
Aggregate fair value of collateral for indemnified securities financing invested in indemnified repurchase agreements	94,423	85,374
Aggregate fair value of cash and securities held by us or our agents as collateral for investments in indemnified repurchase agreements	$ 99,935	$ 91,097