Securities Financing Activities - Types of Financial Assets Pledged and Remaining Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	$ 957,380	$ 715,251
Securities loaned and other	90,719	86,829
Overnight and continuous
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	557,893	406,605
Securities loaned and other	76,306	78,233
Up to 30 days
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	257,142	168,256
Securities loaned and other	484	1,316
30 – 90 days
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	21,880	18,169
Securities loaned and other	1,618	976
Greater than 90 days
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	120,465	122,221
Securities loaned and other	12,311	6,304
Mortgage-backed securities, U.S. GSEs and government agencies
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	126,178	124,776
Securities loaned and other	0	0
Mortgage-backed securities, Residential - nonagency
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	4,610	1,685
Securities loaned and other	0	0
Mortgage-backed securities, Commercial - nonagency
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	646	2,285
Securities loaned and other	0	0
U.S. Treasury, GSEs and government agencies
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	488,806	346,938
Securities loaned and other	2,106	703
Obligations of U.S. states and municipalities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	1,700	1,624
Securities loaned and other	0	0
Non-U.S. government debt
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	211,143	122,346
Securities loaned and other	1,743	1,415
Corporate debt securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	68,363	66,100
Securities loaned and other	4,907	3,433
Asset-backed securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	4,095	6,545
Securities loaned and other	0	0
Equity securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	51,839	42,952
Securities loaned and other	$ 81,963	$ 81,278

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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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