Securitization Activities - Firms Continuing Involvement in Securitization Entities to Which Firm Sold Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	$ 29,131	$ 31,042
Retained interests	1,470	1,564
Purchased interests	50	36
U.S. Government Agency-Issued Collateralized Mortgage Obligations [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	22,360	25,140
Retained interests	964	953
Purchased interests	16	24
Other Residential Mortgage-backed Securities [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	3,077	3,261
Retained interests	416	540
Purchased interests	24	6
Other Commercial Mortgage-backed [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	1,421	357
Retained interests	38	15
Purchased interests	5
CDOs, CLOs And Other [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	2,273	2,284
Retained interests	52	56
Purchased interests	$ 5	$ 6

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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