Noninterest Expense (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Non interest Expense [Line Items]
Federal Deposit Insurance Corporation Premium Expense	$ 1,700	$ 1,500	$ 899
Components of noninterest expense [Abstract]
Compensation expense	30,585	29,037	28,124
Noncompensation expense:
Occupancy expense	3,925	3,895	3,681
Communications and Information Technology	5,224	4,947	4,684
Professional and outside services	7,429	7,482	6,767
Marketing	2,577	3,143	2,446
Other expense	14,032	13,559	14,558
Amortization of intangibles	957	848	936
Total noncompensation expense	34,144	33,874	33,072
Total noninterest expense	64,729	62,911	61,196
Threatened or Pending Litigation [Member]
Other expenses, additional details
Loss Contingency, Loss in Period	$ 5,000	$ 4,900	$ 7,400