Noninterest Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Non interest Expense
Compensation expense	$ 8,019	$ 7,427	$ 16,433	$ 16,040
Noncompensation expense:
Occupancy expense	904	1,080	1,805	2,041
Technology, Communications and Equipment Expense	1,361	1,282	2,693	2,553
Professional and outside services	1,901	1,857	3,635	3,652
Marketing	578	642	1,167	1,322
Other expense	2,951	2,487	5,252	7,319
Amortization of intangibles	152	191	304	384
Total noncompensation expense	7,847	7,539	14,856	17,271
Total noninterest expense	15,866	14,966	31,289	33,311
Other expenses, additional details
Federal Deposit Insurance Corporation Premium Expense	392	413	771	814
Threatened or Pending Litigation
Other expenses, additional details
Loss Contingency, Loss in Period	$ 678	$ 323	$ 1,000	$ 3,000