Trading Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Summary of Trading Assets and Liabilities
Trading assets	$ 35,778	[1]	$ 38,800	[1]
Trading liabilities	20,220	[1]	14,186	[1]
U.S. Treasury [Member]
Summary of Trading Assets and Liabilities
Trading assets	1,931		259
U.S. Government agency issued or guaranteed [Member]
Summary of Trading Assets and Liabilities
Trading assets	216		14
U.S. Government sponsored enterprises [Member]
Summary of Trading Assets and Liabilities
Trading assets			24
Asset-backed Securities [Member]
Summary of Trading Assets and Liabilities
Trading assets	1,027		1,032
Corporate debt securities issued by foreign entities [Member]
Summary of Trading Assets and Liabilities
Trading assets	8,299		11,577
Other securities [Member]
Summary of Trading Assets and Liabilities
Trading assets	36		40
Precious metals [Member]
Summary of Trading Assets and Liabilities
Trading assets	14,459		17,082
Trading liabilities	6,958		6,999
Fair value of derivatives [Member]
Summary of Trading Assets and Liabilities
Trading assets	9,810		8,772
Trading liabilities	12,946		6,844
Securities Sold, Not yet Purchased [Member]
Summary of Trading Assets and Liabilities
Trading liabilities	$ 316		$ 343

[1] The following table summarizes assets and liabilities related to variable interest entities ("VIEs") as of June 30, 2012 and December 31, 2011 which are consolidated on our balance sheet. Assets and liabilities exclude intercompany balances that eliminate in consolidation.