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Subsequent Events	12 Months Ended
	Dec. 31, 2025
Subsequent Events [Abstract]
Subsequent Events	NOTE 22—SUBSEQUENT EVENTS On January 22, 2026, Capital One Financial Corporation entered into an Agreement and Plan of Merger and Reorganization (the “Brex Merger Agreement”) with Brex Inc., a Delaware corporation (“Brex”), and certain other parties thereto, pursuant to which, upon the terms and subject to the conditions set forth therein, the Company will acquire Brex (the “Brex Transaction”). The completion of the Brex Transaction is subject to the satisfaction of customary closing conditions, including clearance under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended. Pursuant to the terms and subject to the conditions set forth in the Brex Merger Agreement, the Company will acquire the outstanding equity of Brex for $5.15 billion in aggregate consideration, subject to certain adjustments described in the Brex Merger Agreement, consisting of approximately $2.58 billion in cash and approximately 10.6 million shares of common stock of Capital One.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/855/tableOfContent

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

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