Offsetting Arrangements (Assets With Offsetting Arrangements) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Offsetting Assets [Line Items]
Derivatives, Gross Amounts of Recognized Assets	$ 11,977	[1]	$ 9,601	[1]
Derivatives, Gross Amounts Offset in Statement of Condition	(6,501)	[2]	(5,045)	[2]
Net Amounts of Assets Presented in Statement of Condition	5,476		4,556
Resale Agreements and Securities Borrowing, Gross Amounts of Recognized Assets	48,221	[1],[3]	35,658	[1],[3]
Resale Agreements and Securities Borrowing, Gross Amounts Offset in Statement of Condition	(30,700)	[2],[3]	(23,809)	[2],[3]
Net Amounts of Assets Presented in Statement of Condition	17,521	[3]	11,849	[3]
Total, Gross Amounts of Recognized Assets	60,198	[1]	45,259	[1]
Total, Gross Amounts Offset in Statement of Condition	(37,201)	[2]	(28,854)	[2]
Total, Net Amounts of Assets Presented in Statement of Condition	22,997		16,405
Securities purchased under resale agreements	6,230		5,016
Securities borrowed subject to master netting arrangements	11,291		6,833
Cash collateral netting
Offsetting Assets [Line Items]
Derivatives, Gross Amounts of Recognized Assets	0	[1]	0	[1]
Derivatives, Gross Amounts Offset in Statement of Condition	(1,928)	[2]	(1,451)	[2]
Net Amounts of Assets Presented in Statement of Condition	(1,928)		(1,451)
Interest-rate contracts
Offsetting Assets [Line Items]
Derivatives, Gross Amounts of Recognized Assets	65	[1]	223	[1]
Derivatives, Gross Amounts Offset in Statement of Condition	(59)	[2]	(19)	[2]
Net Amounts of Assets Presented in Statement of Condition	6		204
Foreign exchange contracts
Offsetting Assets [Line Items]
Derivatives, Gross Amounts of Recognized Assets	11,911	[1]	9,378	[1]
Derivatives, Gross Amounts Offset in Statement of Condition	(4,514)	[2]	(3,575)	[2]
Net Amounts of Assets Presented in Statement of Condition	7,397		5,803
Credit derivative contracts
Offsetting Assets [Line Items]
Derivatives, Gross Amounts of Recognized Assets	1		0
Derivatives, Gross Amounts Offset in Statement of Condition	0		0
Derivatives, Fair Value, Amount Offset Against Collateral, Assets Net	$ 1		$ 0

[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 $17,521 million as of December 31, 2013 was $6,230 million of resale agreements and $11,291 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 11 for additional information with respect to principal securities finance transactions.