Securitization Activities - Firms Continuing Involvement in Securitization Entities to Which Firm Sold Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	$ 100,513	$ 87,742
Retained interests	3,870	3,182
Purchased interests	49	66
U.S. government agency-issued CMOs [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	25,675	20,841
Retained interests	1,487	906
Purchased interests		4
Other Residential Mortgage-backed [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	23,320	24,262
Retained interests	1,053	1,170
Purchased interests	21	23
Other Commercial Mortgage-backed [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	45,735	38,340
Retained interests	1,078	914
Purchased interests	28	39
Corporate debt and other asset-backed [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding principal amount	5,783	4,299
Retained interests	$ 252	$ 192

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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