Variable Interest Entities - Firm Sponsored Variable Interest Entities (Details 0) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Firm-sponsored mortgage and other consumer securitization trusts
Total assets held by securitization VIEs	$ 295,800,000,000	$ 340,000,000,000
Percentage of the Firm's retained securitization interests risk-rated 'A' or better, at fair value	74.00%	68.00%
Investment Bank [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Senior Securities Purchased, Excluded from Interests Continued To Be Held By Transferor, Fair Value	131,000,000	110,000,000
Subordinated Securities Purchased, Excluded From Interests Continued To Be Held by Transferor, Fair Value	45,000,000	8,000,000
Prime [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Total assets held by securitization VIEs	107,200,000,000	129,900,000,000
Prime [Member] \| Investment Grade A or Better
Firm-sponsored mortgage and other consumer securitization trusts
Retained Interest, Fair Value Disclosure	170,000,000	136,000,000
Prime [Member] \| External Credit Rating, Non Investment Grade [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Retained Interest, Fair Value Disclosure	171,000,000	427,000,000
Subprime [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Total assets held by securitization VIEs	34,500,000,000	39,400,000,000
Option Arms
Firm-sponsored mortgage and other consumer securitization trusts
Total assets held by securitization VIEs	26,300,000,000	31,400,000,000
Commercial Mortgage Backed Securities [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Total assets held by securitization VIEs	127,800,000,000	139,300,000,000
Commercial Mortgage Backed Securities [Member] \| Investment Grade A or Better
Firm-sponsored mortgage and other consumer securitization trusts
Retained Interest, Fair Value Disclosure	4,100,000,000	3,400,000,000
Commercial Mortgage Backed Securities [Member] \| External Credit Rating, Non Investment Grade [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Retained Interest, Fair Value Disclosure	164,000,000	283,000,000
Variable Interest Entity, Primary Beneficiary [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Assets held in consolidated securitization VIEs	4,000,000,000	4,400,000,000
Variable Interest Entity, Primary Beneficiary [Member] \| Prime [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Assets held in consolidated securitization VIEs	2,500,000,000	2,700,000,000
Variable Interest Entity, Primary Beneficiary [Member] \| Subprime [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Assets held in consolidated securitization VIEs	1,300,000,000	1,400,000,000
Variable Interest Entity, Primary Beneficiary [Member] \| Option Arms
Firm-sponsored mortgage and other consumer securitization trusts
Assets held in consolidated securitization VIEs	200,000,000	300,000,000
Variable Interest Entity, Primary Beneficiary [Member] \| Commercial Mortgage Backed Securities [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Assets held in consolidated securitization VIEs	0	0
Firm Sponsored Credit Card Securitization Trusts [Member]
Firm-sponsored credit card securitization trusts
Average undivided interest in VIE principal receivables	28.00%	22.00%
Interest in sponsored credit card securitization trusts	15,800,000,000	13,700,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	15,800,000,000	13,700,000,000
Firm Sponsored Credit Card Securitization Trusts [Member] \| Senior securities
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	362,000,000	541,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	362,000,000	541,000,000
Firm Sponsored Credit Card Securitization Trusts [Member] \| Subordinated securities
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	4,600,000,000	3,000,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	4,600,000,000	3,000,000,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	4,700,000,000	4,300,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Assets held in nonconsolidated securitization VIEs with continuing involvement	219,765,000,000	261,170,000,000
Interest in sponsored credit card securitization trusts	4,700,000,000	4,300,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] \| Available-for-sale Securities [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	2,800,000,000	2,000,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	2,800,000,000	2,000,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] \| Trading assets
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	1,900,000,000	2,300,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	1,900,000,000	2,300,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] \| Prime [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	300,000,000	600,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Assets held in nonconsolidated securitization VIEs with continuing involvement	80,572,000,000	101,004,000,000
Interest in sponsored credit card securitization trusts	300,000,000	600,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] \| Prime [Member] \| Available-for-sale Securities [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	0	0
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Prime [Member] \| Trading assets
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	300,000,000	600,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	300,000,000	600,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] \| Subprime [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	100,000,000	0
Firm-sponsored mortgage and other consumer securitization trusts
Assets held in nonconsolidated securitization VIEs with continuing involvement	31,264,000,000	35,755,000,000
Interest in sponsored credit card securitization trusts	100,000,000	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Subprime [Member] \| Available-for-sale Securities [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	0	0
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Subprime [Member] \| Trading assets
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	100,000,000	0
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	100,000,000	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Option Arms
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	0	0
Firm-sponsored mortgage and other consumer securitization trusts
Assets held in nonconsolidated securitization VIEs with continuing involvement	26,095,000,000	31,075,000,000
Interest in sponsored credit card securitization trusts	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Option Arms \| Available-for-sale Securities [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	0	0
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Option Arms \| Trading assets
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	0	0
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Commercial Mortgage Backed Securities [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	4,300,000,000	3,700,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Assets held in nonconsolidated securitization VIEs with continuing involvement	81,834,000,000	93,336,000,000
Interest in sponsored credit card securitization trusts	4,300,000,000	3,700,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] \| Commercial Mortgage Backed Securities [Member] \| Available-for-sale Securities [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	2,800,000,000	2,000,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	2,800,000,000	2,000,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] \| Commercial Mortgage Backed Securities [Member] \| Trading assets
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	1,500,000,000	1,700,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	$ 1,500,000,000	$ 1,700,000,000
Minimum [Member] \| Firm Sponsored Credit Card Securitization Trusts [Member]
Firm-sponsored credit card securitization trusts
Average undivided interest in VIE principal receivables	4.00%
Top of minimum range \| Firm Sponsored Credit Card Securitization Trusts [Member]
Firm-sponsored credit card securitization trusts
Average undivided interest in VIE principal receivables	12.00%

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The percentage of average undivided interest in principal receivables owned by credit card trusts that are sponsored by the entity.

+ References

No definition available.

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- Definition

Percent of retained securitization interests rated A or better.

+ References

No definition available.

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- Definition

Senior securities purchased in connection with IB secondary market making activities. These securities are excluded from entity interest in securitized assets in nonconsolidated VIEs.

+ References

No definition available.

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- Definition

Subordinated securities purchased in connection with IB secondary market making Activities. These securities are excluded from entity interest in securitized assets in nonconsolidated VIEs.

+ References

No definition available.

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- Definition

The carrying amount (fair value) as of the balance sheet date of the transferor's interests in transferred financial assets (typically securitized receivables, generally not involved in the collection of principal) following transfer of significant portions of such financial instruments to other parties. Such interests could be ancillary cash flows and interest-only strips.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)(3)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS140-4/FIN46(R)-8

-Paragraph B11

-Subparagraph b(5)

-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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 17

-Subparagraph i

-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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- Definition

This includes the recognized portion of the total principal amount of financial assets which have been either securitized, used in an asset-backed financing arrangement, or similar transfer which are accounted for as sales and in which the transferor has continuing involvement with the assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 17

-Subparagraph f

-Subclause a

-Clause 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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS140-4/RIN46(R)-8

-Paragraph B11

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-Subclause b

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-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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- Definition

This includes only the derecognized portion of the total principal amount of financial assets which have been either securitized, used in an asset-backed financing arrangement, or similar transfers which are accounted for as sales and in which the transferor has continuing involvement with the assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 17

-Subparagraph f

-Subclause a

-Clause 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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS140-4/FIN46(R)-8

-Paragraph B11

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-Subclause b

-Clause 1

-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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- Definition

The total principal outstanding of financial assets transferred in a securitization, asset-backed financing arrangement, or similar transfer that has been accounted for as sales and in which the transferor continues to have involvement, including both the derecognized and recognized portion of such transferred assets.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 17

-Subparagraph f

-Subclause a

-Clause 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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS140-4 and FIN46(R)-8

-Paragraph B11

-Subparagraph b

-Subclause b

-Clause 1

-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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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the interests continued to be held by a transferor (retained or residual interest) after transferring financial assets to a third party.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 4, 58, 59

-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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 7

-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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