Offsetting Arrangements Assets With Enforceable Netting Arrangements (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Offsetting [Abstract]
Derivative, Net Amount of Assets Presented in Statement of Condition	$ 6,135	[1],[2]	$ 4,556	[1],[2]
Derivatives, Counterparty Netting	0	[2]	0	[2]
Derivatives, Collateral Received	(34)	[2]	(105)	[2]
Derivatives, Net Amount	6,101	[2],[3]	4,451	[2],[3]
Resale Agreements and Securities Borrowing, Resale Agreements and Securities Borrowing, Net Amount of Assets Presented in Statement of Condition	15,460	[4]	11,849	[4]
Resale Agreements and Securities Borrowing, Counterparty Netting	(205)		(126)
Resale Agreements and Securities Borrowing, Collateral Received	(15,192)		(11,626)
Resale Agreements and Securities Borrowing, Net Amount	63	[3]	97	[3]
Total, Net Amounts of Assets Presented in Statement of Condition	21,595		16,405
Total, Counterparty Netting	(205)		(126)
Total, Collateral Received	(15,226)		(11,731)
Total, Net Amount	$ 6,164	[3]	$ 4,548	[3]

[1] Amounts include all transactions regardless of whether or not they are subject to an enforceable netting arrangement.

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

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

[4] Included in the $15,460 million as of June 30, 2013 was $5,569 million of resale agreements and $9,891 million of collateral related to securities borrowing. Included in the $11,849 million as of December 31, 2012 was $5,016 million of resale agreements and $6,833 million of collateral related to securities borrowing. Resale agreements and collateral 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 8 for additional information with respect to principal securities finance transactions.