Collateralized Agreements and Financings - Schedule of Gross Carrying Value of Repurchase Agreements and Securities Loaned (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Offsetting Liabilities [Line Items]
Repurchase agreements	$ 224,328	$ 185,047
Securities loaned	27,054	19,591
Money market instruments [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	88	158
U.S. Government and Agency Obligations [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	121,751	112,903
Non-U.S. Government and Agency Obligations [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	79,159	55,575
Securities loaned	1,634	1,051
Securities Backed By Commercial Real Estate [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	65	210
Securities Backed By Residential Real Estate [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	121	1,079
Corporate debt securities [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	6,364	6,857
Securities loaned	46	122
State and Municipal Obligations [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	92	242
Other debt obligations [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	20	196
Equity Securities [Member]
Offsetting Liabilities [Line Items]
Repurchase agreements	16,668	7,827
Securities loaned	$ 25,374	$ 18,418

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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://fasb.org/us-gaap/role/ref/legacyRef
-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.

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