Noninterest Expense (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Components of noninterest expense [Abstract]
Compensation expense	$ 8,613,000,000	$ 8,263,000,000
Noncompensation expense:
Occupancy expense	961,000,000	978,000,000
Technology, communications and equipment expense	1,271,000,000	1,200,000,000
Professional and outside services	1,795,000,000	1,735,000,000
Marketing	680,000,000	659,000,000
Other expense	4,832,000,000	2,943,000,000
Amortization of intangibles	193,000,000	217,000,000
Total noncompensation expense	9,732,000,000	7,732,000,000
Total noninterest expense	18,345,000,000	15,995,000,000
Pending or Threatened Litigation [Member]
Other expenses, additional details
Loss Contingency, Loss in Period	$ 2,700,000,000	$ 1,100,000,000