Fair Value Option (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Changes in fair value under the fair value option election
Federal funds sold and securities purchased under resale agreements	$ 311	$ 259	$ 314	$ 539
Securities borrowed	(14)	5	(13)	44
Trading assets:
Debt and equity instruments, excluding loans	(136)	233	134	418
Loans reported as trading assets:
Changes in instrument-specific credit risk	(192)	339	721	1,159
Other changes in fair value	1,700	2,233	3,932	3,522
Loans:
Changes in instrument-specific credit risk	16	10	3	89
Other changes in fair value	160	122	442	51
Other assets	47	(133)	5	(235)
Deposits	(97)	(174)	(207)	(466)
Federal funds purchased and securities loaned or sold under repurchase agreements	(56)	(38)	(35)	(103)
Other borrowed funds	2,103	(679)	3,059	233
Trading liabilities	(20)	(16)	(26)	(19)
Beneficial interests issued by consolidated VIEs	14	(64)	(75)	(32)
Other liabilities	(1)	(34)	(8)	(16)
Long-term debt:
Changes in instrument-specific credit risk	874	(207)	1,073	378
Other changes in fair value	662	(455)	545	1,103
Long-term debt
Long-term debt	273,688		273,688		270,653
Fair Value Option (Numeric) [Abstract]
Changes in instrument-specific credit risk related to structured notes	(901)	(246)	1,100	450
Contractual principal outstanding
Loans
Nonaccrual loans	5,987		5,987		6,173
Total loans	45,536		45,536		48,159
Contractual principal outstanding | Principal Protected Debt
Long-term debt
Long-term debt	18,787		18,787		20,761
Long-term beneficial interests
Total long-term beneficial interests	0		0		49
Contractual principal outstanding | Total loans
Loans
Performing loans 90 days or more past due	0		0		0
Nonaccrual loans	863		863		927
All other performing loans	2,020		2,020		2,496
Contractual principal outstanding | Trading assets
Loans
Performing loans 90 days or more past due	0		0		0
Nonaccrual loans	5,124		5,124		5,246
All other performing loans	37,529		37,529		39,490
Fair value
Loans
Nonaccrual loans	1,331		1,331		1,371
Total loans	35,235		35,235		36,446
Long-term debt
Total long term debt	35,865		35,865		38,839
Long-term beneficial interests
Total long-term beneficial interests	905		905		1,495
Fair value | Principal Protected Debt
Long-term debt
Long-term debt	19,954		19,954		21,315
Long-term beneficial interests
Total long-term beneficial interests	0		0		49
Fair value | Non Principal Protected Debt
Long-term debt
Long-term debt	15,911		15,911		17,524
Long-term beneficial interests
Total long-term beneficial interests	905		905		1,446
Fair value | Total loans
Loans
Performing loans 90 days or more past due	0		0		0
Nonaccrual loans	56		56		132
All other performing loans	1,443		1,443		1,434
Fair value | Trading assets
Loans
Performing loans 90 days or more past due	0		0		0
Nonaccrual loans	1,275		1,275		1,239
All other performing loans	32,461		32,461		33,641
Fair value over/(under) contractual principal outstanding
Loans
Nonaccrual loans	(4,656)		(4,656)		(4,802)
Total loans	(10,301)		(10,301)		(11,713)
Fair value over/(under) contractual principal outstanding | Principal Protected Debt
Long-term debt
Long-term debt	1,167		1,167		554
Long-term beneficial interests
Total long-term beneficial interests	0		0		0
Fair value over/(under) contractual principal outstanding | Total loans
Loans
Performing loans 90 days or more past due	0		0		0
Nonaccrual loans	(807)		(807)		(795)
All other performing loans	(577)		(577)		(1,062)
Fair value over/(under) contractual principal outstanding | Trading assets
Loans
Performing loans 90 days or more past due	0		0		0
Nonaccrual loans	(3,849)		(3,849)		(4,007)
All other performing loans	(5,068)		(5,068)		(5,849)
Principal transactions
Changes in fair value under the fair value option election
Federal funds sold and securities purchased under resale agreements	311	259	314	539
Securities borrowed	(14)	5	(13)	44
Trading assets:
Debt and equity instruments, excluding loans	(130)	235	141	431
Loans reported as trading assets:
Changes in instrument-specific credit risk	(161)	359	748	1,157
Other changes in fair value	(130)	530	8	(153)
Loans:
Changes in instrument-specific credit risk	16	10	3	89
Other changes in fair value	160	122	442	51
Other assets	0	0	0	0
Deposits	(97)	(174)	(207)	(466)
Federal funds purchased and securities loaned or sold under repurchase agreements	(56)	(38)	(35)	(103)
Other borrowed funds	2,103	(679)	3,059	233
Trading liabilities	(20)	(16)	(26)	(19)
Beneficial interests issued by consolidated VIEs	14	(64)	(75)	(32)
Other liabilities	0	(30)	(4)	(26)
Long-term debt:
Changes in instrument-specific credit risk	874	(207)	1,073	378
Other changes in fair value	662	(455)	545	1,103
Other income
Changes in fair value under the fair value option election
Federal funds sold and securities purchased under resale agreements	0	0	0	0
Securities borrowed	0	0	0	0
Trading assets:
Debt and equity instruments, excluding loans	(6)	(2)	(7)	(13)
Loans reported as trading assets:
Changes in instrument-specific credit risk	(31)	(20)	(27)	2
Other changes in fair value	1,830	1,703	3,924	3,675
Loans:
Changes in instrument-specific credit risk	0	0	0	0
Other changes in fair value	0	0	0	0
Other assets	47	(133)	5	(235)
Deposits	0	0	0	0
Federal funds purchased and securities loaned or sold under repurchase agreements	0	0	0	0
Other borrowed funds	0	0	0	0
Trading liabilities	0	0	0	0
Beneficial interests issued by consolidated VIEs	0	0	0	0
Other liabilities	(1)	(4)	(4)	10
Long-term debt:
Changes in instrument-specific credit risk	0	0	0	0
Other changes in fair value	0	0	0	0
Letters of Credit Hedged By Derivative Transactions | Other Guarantees and Commitments
Fair Value Option (Numeric) [Abstract]
Contractual amount of letters of credit for which fair value option was elected	3,900		3,900		3,800
Carrying value of letters of credit	(6)		(6)		(6)
Other Guarantees and Commitments
Fair Value Option (Numeric) [Abstract]
Contractual amount of letters of credit for which fair value option was elected	6,113		6,113		6,492
Carrying value of letters of credit	$ (6)		$ (6)		$ (6)