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Regulatory and Capital Adequacy (Tables)

12 Months Ended

Dec. 31, 2025

Mortgage Banking [Abstract]

Schedule of Comparison of Capital Ratios

The following table provides a comparison of our regulatory capital amounts and ratios under the Basel III standardized approach subject to the applicable transition provisions, the regulatory minimum capital adequacy ratios and the applicable well-capitalized standard for each ratio as of December 31, 2025 and 2024.

Table 12.1: Capital Ratios Under Basel III(1)(2)

						December 31, 2025																								December 31, 2024
(Dollars in millions)						Capital Amount						Capital Ratio						Minimum Capital Adequacy						Well- Capitalized						Capital Amount						Capital Ratio						Minimum Capital Adequacy						Well- Capitalized
Capital One Financial Corp:
Common equity Tier 1 capital(3)						$	73,048					14.3		%				4.5		%				N/A						$	50,807					13.5		%				4.5		%				N/A
Tier 1 capital(4)						78,454						15.3						6.0						6.0%						55,652						14.8						6.0						6.0%
Total capital(5)						88,000						17.2						8.0						10.0						61,805						16.4						8.0						10.0
Tier 1 leverage(6)						78,454						12.5						4.0						N/A						55,652						11.6						4.0						N/A
Supplementary leverage(7)						78,454						10.6						3.0						N/A						55,652						9.9						3.0						N/A
CONA:
Common equity Tier 1 capital(3)						68,204						13.4						4.5						6.5						51,118						13.6						4.5						6.5
Tier 1 capital(4)						68,204						13.4						6.0						8.0						51,118						13.6						6.0						8.0
Total capital(5)						76,711						15.1						8.0						10.0						56,937						15.2						8.0						10.0
Tier 1 leverage(6)						68,204						10.9						4.0						5.0						51,118						10.7						4.0						5.0
Supplementary leverage(7)						68,204						9.3						3.0						N/A						51,118						9.2						3.0						N/A

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(1)Capital requirements that are not applicable are denoted by “N/A.”

(2)Capital ratios as of December 31, 2024 reflect the Company’s and the Bank’s election to adopt the optional five-year transition period provided by the Federal Banking Agencies’ final rule (“CECL Transition Rule”) as of January 1, 2020, which was fully effective January 1, 2025.

(3)CET1 capital ratio is a regulatory capital measure calculated based on CET1 capital divided by risk-weighted assets.

(4)Tier 1 capital ratio is a regulatory capital measure calculated based on Tier 1 capital divided by risk-weighted assets.

(5)Total capital ratio is a regulatory capital measure calculated based on total capital divided by risk-weighted assets.

(6)Tier 1 leverage ratio is a regulatory capital measure calculated based on Tier 1 capital divided by adjusted average assets.

(7)Supplementary leverage ratio is a regulatory capital measure calculated based on Tier 1 capital divided by total leverage exposure.

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- References

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- Definition

Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

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