Securitization Activities - Firms Continuing Involvement in Securitization Entities to Which Firm Sold Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	$ 87,742	$ 67,694
Retained interests	3,182	3,372
Purchased interests	66	33
U.S. government agency-issued CMOs [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	20,841	14,328
Retained interests	906	1,530
Purchased interests	4	3
Other Residential Mortgage-backed [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	24,262	24,166
Retained interests	1,170	1,078
Purchased interests	23	24
Other Commercial Mortgage-backed [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	38,340	25,588
Retained interests	914	615
Purchased interests	39	6
Corporate debt and other asset-backed [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	4,299	3,612
Retained interests	$ 192	$ 149

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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=121570589&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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