Regulatory and Capital Adequacy (Tables)

12 Months Ended

Dec. 31, 2023

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, 2023 and 2022.

Table 11.1: Capital Ratios Under Basel III(1)

	December 31, 2023							December 31, 2022
(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(2)	$	47,615	12.9	%	4.5	%	N/A	$	44,731	12.5	%	4.5	%	N/A
Tier 1 capital(3)	52,460		14.2		6.0		6.0%	49,576		13.9		6.0		6.0%
Total capital(4)	59,124		16.0		8.0		10.0	56,714		15.8		8.0		10.0
Tier 1 leverage(5)	52,460		11.2		4.0		N/A	49,576		11.1		4.0		N/A
Supplementary leverage(6)	52,460		9.6		3.0		N/A	49,576		9.5		3.0		N/A
CONA:
Common equity Tier 1 capital(2)	47,933		13.1		4.5		6.5	46,630		13.1		4.5		6.5
Tier 1 capital(3)	47,933		13.1		6.0		8.0	46,630		13.1		6.0		8.0
Total capital(4)	52,636		14.3		8.0		10.0	51,165		14.4		8.0		10.0
Tier 1 leverage(5)	47,933		10.3		4.0		5.0	46,630		10.5		4.0		5.0
Supplementary leverage(6)	47,933		8.8		3.0		N/A	46,630		9.0		3.0		N/A

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

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

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

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

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

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