Trading Assets and Liabilities - Trading Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	$ 28,894		$ 30,874
Trading liabilities	10,875		14,699
U.S. Treasury [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	1,344		2,484
US Government Agencies Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	19		337
US Government sponsored enterprises [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	159	[1]	32	[1]
Obligations of U.S. states and political subdivision [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	25		0
Asset backed securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	481		687
Corporate and foreign bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	9,099	[2]	9,583	[2]
Other securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	25		36
Precious metals [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	11,751		12,332
Trading liabilities	3,826		5,767
Derivatives [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	5,991		5,383
Trading liabilities	6,741		8,725
Securities sold, not yet purchased [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading liabilities	$ 308		$ 207

[1] Includes mortgage backed securities of $133 million and $16 million issued or guaranteed by the Federal National Mortgage Association ("FNMA") and $26 million and $16 million issued or guaranteed by the Federal Home Loan Mortgage Corporation ("FHLMC") at December 31, 2013 and 2012, respectively.

[2] We did not hold any foreign bonds issued by the governments of Greece, Ireland, Italy, Portugal or Spain at either December 31, 2013 or December 31, 2012.