Commitments and Guarantees (Net Outstanding Standby Letters of Credit) (Details) (Financial Standby Letter of Credit [Member], USD $) In Billions, unless otherwise specified	Sep. 30, 2011		Dec. 31, 2010
Financial Standby Letter of Credit [Member]
Standby letters of credit	$ 10.9		$ 10.1
Standby letters of credit - Pass	93.00%	[1]	90.00%	[1]
Standby letters of credit - Below pass	7.00%	[2]	10.00%	[2]

[1] Indicates that expected risk of loss is currently low.

[2] Indicates a higher degree of risk of default.