Fair Value, Assets and Liabilities Measured on Recurring Basis Level 3 Reconciliation Detail (Details 1) (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Available for sale Securities [Member]
Assets:
Purchase	$ 6,916		$ 13,366
Sales	(415)		(708)
Issuances	1,004		2,416
Settlements	(2,905)		(9,619)
Purchases, sales, issuances and settlements, net	4,600	2,323	5,455	4,722
Available for sale Securities [Member] \| Debt Securities [Member]
Assets:
Purchase	6,916		13,362
Sales	(402)		(695)
Issuances	1,004		2,416
Settlements	(2,737)		(8,424)
Purchases, sales, issuances and settlements, net	4,781	2,494	6,659	4,634
Available for sale Securities [Member] \| US States and Political Subdivisions [Member]
Assets:
Purchase	1,325		2,958
Sales	(5)		(4)
Issuances	462		1,339
Settlements	(1,030)		(1,464)
Purchases, sales, issuances and settlements, net	752	899	2,829	2,697
Available for sale Securities [Member] \| Mortgage Backed Securities [Member]
Assets:
Purchase	0		25
Sales	0		0
Issuances	0		0
Settlements	(14)		(23)
Purchases, sales, issuances and settlements, net	(14)	(43)	2	(64)
Available for sale Securities [Member] \| Residential [Member]
Assets:
Purchase	0		4
Sales	0		0
Issuances	0		0
Settlements	(3)		(6)
Purchases, sales, issuances and settlements, net	(3)	(30)	(2)	(44)
Available for sale Securities [Member] \| Commercial [Member]
Assets:
Purchase	0		21
Sales	0		0
Issuances	0		0
Settlements	(11)		(17)
Purchases, sales, issuances and settlements, net	(11)	(13)	4	(20)
Available for sale Securities [Member] \| Collateralized debt obligations [Member]
Assets:
Purchase	1,588		4,323
Sales	0		(20)
Issuances	0		0
Settlements	(270)		(817)
Purchases, sales, issuances and settlements, net	1,318	390	3,486	867
Available for sale Securities [Member] \| Corporate debt securities [Member]
Assets:
Purchase	1		97
Sales	(167)		(202)
Issuances	0		0
Settlements	(9)		(69)
Purchases, sales, issuances and settlements, net	(175)	(22)	(174)	(72)
Available for sale Securities [Member] \| Total asset-backed securities [Member]
Assets:
Purchase	4,002		5,959
Sales	(230)		(384)
Issuances	542		1,077
Settlements	(1,414)		(6,051)
Purchases, sales, issuances and settlements, net	2,900	1,270	601	1,194
Available for sale Securities [Member] \| Auto loans and leases [Member]
Assets:
Purchase	3,610		4,599
Sales	0		0
Issuances	107		270
Settlements	(1,047)		(4,399)
Purchases, sales, issuances and settlements, net	2,670	1,199	470	(278)
Available for sale Securities [Member] \| Home Equity Loans [Member]
Assets:
Purchase	0		0
Sales	0		0
Issuances	0		0
Settlements	(1)		(3)
Purchases, sales, issuances and settlements, net	(1)	49	(3)	47
Available for sale Securities [Member] \| Other asset-backed securities [Member]
Assets:
Purchase	392		1,360
Sales	(230)		(384)
Issuances	435		807
Settlements	(366)		(1,649)
Purchases, sales, issuances and settlements, net	231	22	134	1,425
Available for sale Securities [Member] \| Other Debt Securities, Excluding Asset Backed Securities [Member]
Assets:
Purchase			0
Sales			(85)
Issuances			0
Settlements			0
Purchases, sales, issuances and settlements, net		0	(85)	12
Available for sale Securities [Member] \| Equity Securities [Member]
Assets:
Purchase	0		4
Sales	(13)		(13)
Issuances	0		0
Settlements	(168)		(1,195)
Purchases, sales, issuances and settlements, net	(181)	(171)	(1,204)	88
Available for sale Securities [Member] \| Perpetual preferred securities [Member]
Assets:
Purchase	0		1
Sales	(13)		(13)
Issuances	0		0
Settlements	(166)		(1,193)
Purchases, sales, issuances and settlements, net	(179)	(172)	(1,205)	125
Available for sale Securities [Member] \| Other equity securities [Member]
Assets:
Purchase	0		3
Sales	0		0
Issuances	0		0
Settlements	(2)		(2)
Purchases, sales, issuances and settlements, net	(2)	1	1	(37)
Trading Securities [Member]
Assets:
Purchase	774		2,462
Sales	(990)		(2,722)
Issuances	0		0
Settlements	(32)		(98)
Purchases, sales, issuances and settlements, net	(248)	476	(358)	639
Trading Securities [Member] \| US States and Political Subdivisions [Member]
Assets:
Purchase	124		310
Sales	(79)		(177)
Issuances	0		0
Settlements	0		(1)
Purchases, sales, issuances and settlements, net	45	(2)	132	(11)
Trading Securities [Member] \| Mortgage Backed Securities [Member]
Assets:
Purchase	87		656
Sales	(186)		(650)
Issuances	0		0
Settlements	(1)		(5)
Purchases, sales, issuances and settlements, net	(100)	266	1	345
Trading Securities [Member] \| Collateralized debt obligations [Member]
Assets:
Purchase	409		933
Sales	(577)		(1,165)
Issuances	0		0
Settlements	0		(41)
Purchases, sales, issuances and settlements, net	(168)	57	(273)	309
Trading Securities [Member] \| Corporate debt securities [Member]
Assets:
Purchase	30		61
Sales	(38)		(134)
Issuances	0		0
Settlements	(2)		1
Purchases, sales, issuances and settlements, net	(10)	8	(72)	70
Trading Securities [Member] \| Total asset-backed securities [Member]
Assets:
Purchase	121		493
Sales	(110)		(571)
Issuances	0		0
Settlements	(29)		(40)
Purchases, sales, issuances and settlements, net	(18)	169	(118)	(64)
Trading Securities [Member] \| Equity Securities [Member]
Assets:
Purchase	3		9
Sales	0		(25)
Issuances	0		0
Settlements	0		(12)
Purchases, sales, issuances and settlements, net	3	(22)	(28)	(10)
Trading assets (excluding derivatives) [Member]
Assets:
Purchase	774		2,464
Sales	(990)		(2,722)
Issuances	0		0
Settlements	(32)		(99)
Purchases, sales, issuances and settlements, net	(248)	479	(357)	637
Trading assets (excluding derivatives) [Member] \| Other Trading Assets [Member]
Assets:
Purchase	0		2
Sales	0		0
Issuances	0		0
Settlements	0		(1)
Purchases, sales, issuances and settlements, net	0	3	1	(2)
Mortgages held for sale [Member]
Assets:
Purchase	106		472
Sales	0		0
Issuances	0		0
Settlements	(180)		(500)
Purchases, sales, issuances and settlements, net	(74)	2	(28)	(249)
Loans [Member]
Assets:
Purchase	0		0
Sales	0		(309)
Issuances	0		0
Settlements	0		(13)
Purchases, sales, issuances and settlements, net	0	(30)	(322)	(81)
Mortgage servicing rights [Member]
Assets:
Purchase	0		0
Sales	0		0
Issuances	744		2,746
Settlements	0		0
Purchases, sales, issuances and settlements, net	744	1,042	2,746	3,040
Foreign Exchange Contract [Member] \| Derivatives [Member]
Assets and Liabilities:
Purchases	1		4
Sales	(1)		(4)
Issuances	0		0
Settlements	5		(6)
Purchases, sales, issuances and settlements, net	5	9	(6)	11
Interest Rate Contract [Member] \| Derivatives [Member]
Assets and Liabilities:
Purchases	0		6
Sales	0		0
Issuances	0		0
Settlements	(1,448)		(2,583)
Purchases, sales, issuances and settlements, net	(1,448)	(1,761)	(2,577)	(3,677)
Equity Contract [Member] \| Derivatives [Member]
Assets and Liabilities:
Purchases	12		82
Sales	(4)		(178)
Issuances	0		0
Settlements	(10)		105
Purchases, sales, issuances and settlements, net	(2)	7	9	149
Commodity Contract [Member] \| Derivatives [Member]
Assets and Liabilities:
Purchases	7		7
Sales	(17)		(17)
Issuances	0		0
Settlements	0		1
Purchases, sales, issuances and settlements, net	(10)	0	(9)	0
Credit Contract [Member] \| Derivatives [Member]
Assets and Liabilities:
Purchases	1		4
Sales	0		(2)
Issuances	0		0
Settlements	(41)		(170)
Purchases, sales, issuances and settlements, net	(40)	(27)	(168)	(4)
Other Contract [Member] \| Derivatives [Member]
Assets and Liabilities:
Purchases	0		0
Sales	0		0
Issuances	0		0
Settlements	(1)		0
Purchases, sales, issuances and settlements, net	(1)	(12)	0	(7)
Derivatives [Member]
Assets and Liabilities:
Purchases	21		103
Sales	(22)		(201)
Issuances	0		0
Settlements	(1,495)		(2,653)
Purchases, sales, issuances and settlements, net	(1,496)	(1,784)	(2,751)	(3,528)
Other Assets [Member]
Assets:
Purchase	19		8
Sales	(5)		(5)
Issuances	0		0
Settlements	(44)		(55)
Purchases, sales, issuances and settlements, net	(30)	(18)	(52)	(67)
Short sale liabilities (corporate debt securities) [Member]
Liabilities:
Purchases, sales, issuances and settlements, net		5		(37)
Other Liabilities Excluding Derivatives And Short Sale Liabilities [Member]
Liabilities:
Purchases	(8)		(9)
Sales	1		1
Issuances	0		0
Settlements	0		317
Purchases, sales, issuances and settlements, net	(7)	27	309	62
Other Securities Sold Not Yet Purchased [Member]
Liabilities:
Purchases	(9)		(124)
Sales	1		115
Issuances	0		0
Settlements	1		1
Purchases, sales, issuances and settlements, net	$ (7)		$ (8)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Issues that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

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This element represents purchases, sales, issuances, and settlements (net) which have taken place during the period in relation to assets measured at fair value on a recurring basis using unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Sales that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Issues that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Purchases that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

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This element represents purchases, sales, issuances, and settlements (net) which have taken place during the period in relation to liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3).

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Sales that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Settlements that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Issues that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Purchases that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Sales that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Settlements that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

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This element represents purchases, sales, issuances, and settlements (net) which have taken place during the period in relation to net asset (liability) measured at fair value on a recurring basis using unobservable inputs (Level 3).

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