Commitments And Contingencies (Schedule Of Repurchase Agreements) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Commitments And Contingencies [Abstract]
Aggregate fair value of indemnified securities financing	$ 302,342	[1]	$ 334,235	[1]
Aggregate fair value of cash and securities held as collateral for indemnified securities financing	312,598		343,410
Aggregate fair value of collateral for indemnified securities financing invested in indemnified repurchase agreements	88,656	[1]	89,069	[1]
Aggregate fair value of cash and securities held as collateral for indemnified repurchase agreements	$ 93,039		$ 93,294

[1] Related collateral and other information is provided in the following "Securities Finance" section.