Offsetting Arrangements (Liabilities With Offsetting Arrangements) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ 8,121	[1]	$ 11,811	[1]
Gross Amounts Offset in Statement of Condition	(3,809)	[1]	(5,552)	[1],[2]
Net Amounts of Liabilities Presented in Statement of Condition	4,312	[1]	6,259
Gross Amounts of Recognized Liabilities	45,545	[1],[3]	45,273	[1],[3]
Gross Amounts Offset in Statement of Condition	(30,307)	[2],[3]	(30,700)	[2],[3]
Net Amounts of Liabilities Presented in Statement of Condition	15,238	[3]	14,573	[3]
Gross Amounts of Recognized Liabilities	53,666	[1]	57,084	[1]
Gross Amounts Offset in Statement of Condition	(34,116)	[2]	(36,252)	[2]
Total, Net Amount of Liabilities Presented in Statement of Condition	19,550		20,832
Securities sold under repurchase agreements	8,953		7,953
Securities Lending, Fair Value, Amount Not Offset Against Collateral	6,285		6,620
Cash collateral netting
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	0	[1]	0	[1]
Gross Amounts Offset in Statement of Condition	(274)		(979)	[2]
Net Amounts of Liabilities Presented in Statement of Condition	(274)		(979)
Interest-rate contracts
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	269	[1]	331	[1]
Gross Amounts Offset in Statement of Condition	(45)	[2]	(59)	[2]
Net Amounts of Liabilities Presented in Statement of Condition	224		272
Foreign exchange contracts
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	7,842	[1]	11,471	[1]
Gross Amounts Offset in Statement of Condition	(3,489)	[2]	(4,514)	[2]
Net Amounts of Liabilities Presented in Statement of Condition	4,353		6,957
Other derivative contracts
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	10		9	[1]
Gross Amounts Offset in Statement of Condition	(1)		0	[2]
Net Amounts of Liabilities Presented in Statement of Condition	$ 9		$ 9

[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] Included in the $15,238 million as of March 31, 2014 was $8,953 million of repurchase agreements and $6,285 million of collateral received related to securities lending. Included in the $14,573 million as of December 31, 2013 was $7,953 million of repurchase agreements and $6,620 million of collateral received related to securities lending. Repurchase agreements and collateral received related to securities lending were recorded in securities sold under repurchase agreements and accrued expenses and other liabilities, respectively, in our consolidated statement of condition. Refer to note 7 for additional information with respect to principal securities finance transactions.