Fair Value Measurements (Details Textual) (USD $)	3 Months Ended		6 Months Ended						6 Months Ended	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010	Jun. 30, 2011 Long-Term Debt [Member]	Jun. 30, 2011 Capitalized software development costs [Member]	Mar. 31, 2011 Capitalized software development costs [Member]	Jun. 30, 2012 Derivative Assets [Member]	Dec. 31, 2011 Derivative Assets [Member]	Jun. 30, 2012 Derivative Liabilities [Member]	Dec. 31, 2011 Derivative Liabilities [Member]	Jun. 30, 2012 Fair Value Measurements Recurring [Member] Trading Derivative Assets [Member]	Dec. 31, 2011 Fair Value Measurements Recurring [Member] Trading Derivative Assets [Member]	Jun. 30, 2012 Fair Value Measurements Recurring [Member] Trading Derivative Liabilities [Member]	Dec. 31, 2011 Fair Value Measurements Recurring [Member] Trading Derivative Liabilities [Member]
Fair Value Measurements (Textual) [Abstract]
Fair value of the derivative asset																$ 9,800,000,000	$ 8,800,000,000
Fair value of the derivative liability																		12,900,000,000	6,800,000,000
Net Derivatives	4,006,000,000	4,091,000,000	4,006,000,000	4,091,000,000	3,884,000,000	4,157,000,000	3,392,000,000	3,500,000,000				2,400,000,000	2,200,000,000	1,500,000,000	1,100,000,000
Impairment of capitalized software development costs											78,000,000
Additional Charge related to Impairment of capitalized software development costs										16,000,000
Long-term debt from Level 3 to Level 2	314,000,000	43,000,000	488,000,000	130,000,000					86,000,000
Fair Value Measurements (Additional Textual) [Abstract]
Transfer of deposits in domestic offices	313,000,000		475,000,000
Transfer of credit derivatives from Level 3 to level 2				62,000,000
Deferred fees on commitments and standby letters of credit	$ 52,000,000		$ 52,000,000			$ 44,000,000
Period for which carrying amount of property is reduced			not less than once every 45 days