Securities Financing Activities - Types of Financial Assets Pledged and Remaining Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	$ 826,035	$ 603,683
Securities loaned and other	89,278	58,989
Overnight and continuous
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	422,773	308,392
Securities loaned and other	78,188	54,066
Up to 30 days
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	267,293	171,346
Securities loaned and other	1,195	1,463
30 – 90 days
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	28,134	19,932
Securities loaned and other	2	1
Greater than 90 days
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	107,835	104,013
Securities loaned and other	9,893	3,459
Mortgage-backed securities, U.S. GSEs and government agencies
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	123,264	82,645
Securities loaned and other	0	0
Mortgage-backed securities, Residential - nonagency
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	2,044	2,610
Securities loaned and other	0	0
Mortgage-backed securities, Commercial - nonagency
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	2,246	2,344
Securities loaned and other	0	0
U.S. Treasury, GSEs and government agencies
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	395,629	300,022
Securities loaned and other	675	759
Obligations of U.S. states and municipalities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	1,937	1,872
Securities loaned and other	0	0
Non-U.S. government debt
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	192,307	117,614
Securities loaned and other	2,803	1,852
Corporate debt securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	62,174	44,495
Securities loaned and other	4,245	4,033
Asset-backed securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	5,546	4,619
Securities loaned and other	0	0
Equity securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	40,888	47,462
Securities loaned and other	$ 81,555	$ 52,345

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-15

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483466/210-20-50-3

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- Definition

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 not subject to a master netting arrangement and elected not to be offset.

+ References

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