Offsetting Arrangements (Assets With Enforceable Netting Arrangements) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Offsetting [Abstract]
Derivative, Net Amount of Assets Presented in Statement of Condition	$ 3,469		$ 5,476
Derivatives, Counterparty Netting	0	[1]	0	[1]
Derivatives, Collateral Received	(187)	[1]	(181)	[1]
Derivatives, Net Amount	3,282	[2]	5,295	[2]
Resale Agreements and Securities Borrowing, Resale Agreements and Securities Borrowing, Net Amount of Assets Presented in Statement of Condition	17,408	[3]	17,521	[3]
Resale Agreements and Securities Borrowing, Counterparty Netting	(113)	[1]	(131)	[1]
Resale Agreements and Securities Borrowing, Collateral Received	(15,099)	[1]	(14,983)	[1]
Resale Agreements and Securities Borrowing, Net Amount	2,196	[2]	2,407	[2]
Total, Net Amounts of Assets Presented in Statement of Condition	20,877		22,997
Total, Counterparty Netting	(113)	[1]	(131)	[1]
Total, Collateral Received	(15,286)	[1]	(15,164)	[1]
Total, Net Amount	$ 5,478	[2]	$ 7,702	[2]

[1] Amounts subject to netting arrangements which have been determined to be legally enforceable

[2] Includes amounts secured by collateral not determined to be subject to enforceable netting arrangements.

[3] Included in the $17,408 million as of March 31, 2014 was $6,087 million of resale agreements and $11,321 million of collateral provided related to securities borrowing. Included in the $17,521 million as of December 31, 2013 was $6,230 million of resale agreements and $11,291 million of collateral provided related to securities borrowing. Resale agreements and collateral provided related to securities borrowing were recorded in securities purchased under resale agreements and other assets, respectively, in our consolidated statement of condition. Refer to note 7 for additional information with respect to principal securities finance transactions.