Collateralized Agreements and Financings - Schedule of Gross Carrying Value of Repurchase Agreements and Securities Loaned (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Offsetting Liabilities [Line Items]
Repurchase agreements	$ 278,163	$ 224,328
Securities loaned	45,886	27,054
Money market instruments [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	1,104	88
Securities loaned	3	0
U.S. Government and Agency Obligations [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	120,020	121,751
Non-U.S. Government and Agency Obligations [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	117,732	79,159
Securities loaned	1,471	1,634
Securities Backed By Commercial Real Estate [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	237	65
Securities Backed By Residential Real Estate [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	729	121
Corporate debt securities [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	13,859	6,364
Securities loaned	902	46
State and Municipal Obligations [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	135	92
Other debt obligations [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	365	20
Equity Securities [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	23,982	16,668
Securities loaned	$ 43,510	$ 25,374

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Amount, before effects of master netting arrangements, of securities loaned to entities in exchange for collateral. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313

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Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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