Offsetting Arrangements Assets With Enforceable Netting Arrangements (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Offsetting [Abstract]
Net Amount of Assets Presented in Statement of Condition	$ 322	[1],[2]	$ 433	[1],[2]
Financial Instruments	0	[1]	0	[1]
Cash Collateral Received	0	[1]	0	[1]
Net Amount	322	[1]	433	[1]
Net Amount of Assets Presented in Statement of Condition	17,794	[3],[4]	11,848	[3],[4]
Financial Instruments	202	[4]	126	[4]
Cash Collateral Received	0	[4]	0	[4]
Net Amount	17,592	[4]	11,722	[4]
Net Amounts of Assets Presented in Statement of Condition	18,116		12,281
Financial Instruments	202		126
Cash Collateral Received	0		0
Net Amount	17,914		12,155
Non-cash Collateral	$ 42		$ 105

[1] Excludes the impact of non-cash collateral of $42 million and $105 million as of March 31, 2013 and December 31, 2012, respectively.

[2] In addition to the $322 million and $433 million as of March 31, 2013 and December 31, 2012, respectively. we have $4,189 million and $4,123 million, respectively, of derivative assets not determined to be subject to enforceable netting arrangements. Refer to notes 2 and 10 for additional information with respect to derivative financial instrument balances recorded in our consolidated statement of condition.

[3] Included in the $17,794 million as of March 31, 2013 was $8,703 million of resale agreements and $9,091 million of securities borrowing. Included in the $11,848 million as of December 31, 2012 was $5,016 million of resale agreements and $6,832 million of securities borrowing. Resale agreements and securities borrowing were recorded in securities purchased under resale agreements and other assets, respectively, in our consolidated statement of condition. Refer to notes 6 and 7 for additional information with respect to these arrangements.

[4] Excludes the impact of non-cash collateral. These secured financing transactions are fully collateralized.