Noninterest Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Non interest Expense [Line Items]
Compensation expense	$ 7,503	$ 6,908	$ 23,543	$ 22,740
Noncompensation expense:
Occupancy expense	973	935	3,014	2,848
Technology, Communications and Equipment Expense	1,312	1,248	3,865	3,665
Professional and outside services	1,759	1,860	5,411	5,461
Marketing	607	926	1,929	2,329
Other expense	3,035	3,445	10,354	10,687
Amortization of intangibles	182	212	566	641
Total noncompensation expense	7,868	8,626	25,139	25,631
Total noninterest expense	15,371	15,534	48,682	48,371
Threatened or Pending Litigation [Member]
Other expenses, additional details
Loss Contingency, Loss in Period	$ 790	$ 1,300	$ 3,800	$ 4,300