Derivative Positions (Parenthetical) (Detail) (USD $) Share data in Millions					1 Months Ended			1 Months Ended
	Jun. 30, 2011 Derivative Financial Instruments, Assets Nondesignated Trading Activity	Dec. 31, 2010 Derivative Financial Instruments, Assets Nondesignated Trading Activity	Jun. 30, 2011 Derivative Financial Instruments, Assets Nondesignated Future Loans	Dec. 31, 2010 Derivative Financial Instruments, Assets Nondesignated Future Loans	May 31, 2009 Derivative Financial Instruments, Liabilities Visa Interest Nondesignated	Jun. 30, 2011 Derivative Financial Instruments, Liabilities Nondesignated	Dec. 31, 2010 Derivative Financial Instruments, Liabilities Nondesignated	May 31, 2009 Visa Interest	Jun. 30, 2011 Nondesignated Trading Activity	Dec. 31, 2010 Nondesignated Trading Activity
Notional amounts related to interest rate futures	$ 29,700,000,000	$ 25,000,000,000	$ 1,000,000,000	$ 1,400,000,000
Notional related to equity futures	600,000,000	500,000,000
Asset amount notional from purchased and written interest rate swap risk participation agreements									1,000,000	1,000,000
Liability amount notional from purchased and written interest rate swap risk participation agreements									8,000,000	8,000,000
Derivative liability recorded in other liabilities, established upon the sale of Visa Class B shares						17,000,000	23,000,000
Notional amount, established upon the sale of Visa Class B shares						$ 134,000,000	$ 134,000,000
Shares of Class B Visa Inc. common stock sold to another financial institution, shares					3.2			3.2