Trading Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	$ 22,099		$ 28,894
Trading liabilities	9,177		10,875
U.S. Treasury [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	1,955		1,344
US Government agency issued or guaranteed [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	3		19
US Government sponsored enterprises [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	97	[1]	159	[1]
Obligations of U.S. states and political subdivision [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	611		25
Asset backed securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	502		481
Corporate and foreign bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	6,265		9,099
Other securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	22		25
Precious metals [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	7,998		11,751
Trading liabilities	3,118		3,826
Securities sold, not yet purchased [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading liabilities	507		308
Derivatives [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	4,646		5,991
Derivatives [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading liabilities	$ 5,552		$ 6,741

[1] Includes mortgage backed securities of $97 million and $133 million issued or guaranteed by the Federal National Mortgage Association ("FNMA") and $0 million and $26 million issued or guaranteed by the Federal Home Loan Mortgage Corporation ("FHLMC") at September 30, 2014 and December 31, 2013, respectively.