Securitization Activities - Firms Continuing Involvement in Securitization Entities to Which Firm Sold Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	$ 35,833	$ 50,857
Retained interests	1,880	1,159
Purchased interests	16	72
U.S. Government Agency-Issued Collateralized Mortgage Obligations [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	26,735	39,088
Retained interests	1,060	846
Purchased interests	5	20
Other Residential Mortgage-backed Securities [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	3,179	2,195
Retained interests	731	154
Purchased interests		17
Other Commercial Mortgage-backed [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	3,255	6,842
Retained interests	26	115
Purchased interests		28
CDOs, CLOs And Other [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	2,664	2,732
Retained interests	63	44
Purchased interests	$ 11	$ 7

Purchased interests in securitization entities in which the firm also holds retained interests.

No definition available.

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- Definition

Retained interest continued to be held by a transferor after transferring financial assets to a third party.

+ References

No definition available.

+ Details

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- Definition

Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is 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)(1)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107314-111719

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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