Interest Income and Interest Expense (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Interest income
Loans	$ 9,193	$ 9,955	$ 27,840	$ 30,481
Securities	2,156	2,157	6,962	7,578
Trading assets	2,768	2,752	8,619	8,086
Federal funds sold and securities purchased under resale agreements	683	448	1,830	1,253
Securities borrowed	18	66	95	127
Deposits with banks	184	82	429	269
Other assets	158	146	464	376
Total interest income	15,160	15,606	46,239	48,170
Interest expense
Interest-bearing deposits	993	846	3,038	2,573
Short-term and other liabilities	697	420	2,405	1,478
Long-term debt	1,477	1,551	4,646	4,297
Beneficial interests issued by consolidated VIEs	176	287	592	923
Interest expense	3,343	3,104	10,681	9,271
Net interest income	11,817	12,502	35,558	38,899
Provision for credit losses	2,411	3,223	5,390	13,596
Net interest income after provision for credit losses	$ 9,406	$ 9,279	$ 30,168	$ 25,303