Trading Assets and Liabilities (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets		$ 15,652	$ 21,092
Trading liabilities	[1]	6,336	8,164
U.S. Treasury [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets		2,869	2,675
US Government agency issued or guaranteed [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets		10	3
US Government sponsored enterprises [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	[2]	156	45
Obligations of U.S. states and political subdivision [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets		572	591
Asset backed securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets		440	481
Corporate and foreign bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets		5,559	9,681
Other securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets		18	22
Precious metals [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets		1,893	1,992
Trading liabilities		0	22
Securities sold, not yet purchased [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading liabilities		717	683
Derivatives [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets		4,135	5,602
Derivatives [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading liabilities		5,619	7,459
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] | US Government sponsored enterprises [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets		$ 156	$ 45

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") as of September 30, 2015 and December 31, 2014 which are consolidated on our balance sheet. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 216, "Variable Interest Entities," for additional information. Assets: Other assets $338 million and $380 million. Total assets $338 million and $380 million respectively. Liabilities: Long-term debt $92 million and $92 million, Interest, taxes and other liabilities $69 million and $75 million. Total liabilities $161 million and $167 million, respectively.

[2] Consists of mortgage backed securities of $156 million and $45 million issued or guaranteed by the Federal National Mortgage Association ("FNMA") at September 30, 2015 and December 31, 2014, respectively.