Offsetting Arrangements Liabilities With Offsetting Arrangements (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ 4,778	[1]	$ 4,399	[1]
Gross Amounts Offset in Statement of Condition	4,595	[1]	4,071	[1]
Net Amounts of Liabilities Presented in Statement of Condition	183	[1]	328	[1]
Gross Amounts of Recognized Liabilities	18,643	[2]	12,992	[2]
Gross Amounts Offset in Statement of Condition	0	[2]	0	[2]
Net Amounts of Liabilities Presented in Statement of Condition	18,643	[2],[3]	12,992	[2],[3]
Gross Amounts of Recognized Liabilities	23,421		17,391
Gross Amounts Offset in Statement of Condition	4,595		4,071
Net Amount of Liabilities Presented in Statement of Condition	18,826		13,320
Derivative liability, not subject to master netting arrangement	5,187		5,039
Securities for repurchase agreements subject to master netting arrangements	11,538		8,006
Securities lending subject to master netting arrangements	7,105		4,986
Interest-rate contracts
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	313		345
Gross Amounts Offset in Statement of Condition	12		19
Net Amounts of Liabilities Presented in Statement of Condition	301		326
Foreign exchange contracts
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	4,465		4,054
Gross Amounts Offset in Statement of Condition	3,567		3,575
Net Amounts of Liabilities Presented in Statement of Condition	898		479
Cross product and cash collateral netting
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	0		0
Gross Amounts Offset in Statement of Condition	1,016		477
Net Amounts of Liabilities Presented in Statement of Condition	$ (1,016)		$ (477)

[1] In addition to the $183 million and $328 million as of March 31, 2013 and December 31, 2012, respectively, we have $5,187 million and $5,039 million, respectively, of derivative liabilities 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.

[2] Included in the $18,643 million as of March 31, 2013 was $11,538 million of repurchase agreements and $7,105 million of securities lending. Included in the $12,992 million as of December 31, 2012 was $8,006 million of repurchase agreements and $4,986 million of securities lending. Repurchase agreements and securities lending were recorded in securities sold under repurchase agreements and other liabilities, respectively, in our consolidated statement of condition. Refer to note 7 for additional information with respect to these arrangements.

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