Noninterest Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Non interest Expense
Compensation expense	$ 8,414	$ 8,613
Noncompensation expense:
Occupancy expense	901	961
Technology, Communications and Equipment Expense	1,332	1,271
Professional and outside services	1,734	1,795
Marketing	589	680
Other expense	2,301	4,832
Amortization of intangibles	152	193
Total noncompensation expense	7,009	9,732
Total noninterest expense	15,423	18,345
Other expenses, additional details
Federal Deposit Insurance Corporation Premium Expense	379	401
Threatened or Pending Litigation
Other expenses, additional details
Loss Contingency, Loss in Period	$ 347	$ 2,700