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Regulatory and Capital Adequacy (Tables) | 12 Months Ended
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Dec. 31, 2020
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 PCA well-capitalized level for each ratio, where applicable, as of December 31, 2020 and 2019. Table 11.1: Capital Ratios Under Basel III(1)
|  | December 31, 2020 |  | December 31, 2019
(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) |  | $ | 40,736 |  |  | 13.7 | % |  | 4.5 | % |  | N/A |  | $ | 38,162 |  |  | 12.2 | % |  | 4.5 | % |  | N/A
Tier 1 capital(3) |  | 45,583 |  |  | 15.3 |  |  | 6.0 |  |  | 6.0 | % |  | 43,015 |  |  | 13.7 |  |  | 6.0 |  |  | 6.0 | %
Total capital(4) |  | 52,788 |  |  | 17.7 |  |  | 8.0 |  |  | 10.0 |  |  | 50,348 |  |  | 16.1 |  |  | 8.0 |  |  | 10.0 |
Tier 1 leverage(5) |  | 45,583 |  |  | 11.2 |  |  | 4.0 |  |  | N/A |  | 43,015 |  |  | 11.7 |  |  | 4.0 |  |  | N/A
Supplementary leverage(6) |  | 45,583 |  |  | 10.7 |  |  | 3.0 |  |  | N/A |  | 43,015 |  |  | 9.9 |  |  | 3.0 |  |  | N/A
COBNA: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity Tier 1 capital(2) |  | 19,924 |  |  | 21.5 |  |  | 4.5 |  |  | 6.5 |  |  | 17,883 |  |  | 16.1 |  |  | 4.5 |  |  | 6.5 |
Tier 1 capital(3) |  | 19,924 |  |  | 21.5 |  |  | 6.0 |  |  | 8.0 |  |  | 17,883 |  |  | 16.1 |  |  | 6.0 |  |  | 8.0 |
Total capital(4) |  | 21,708 |  |  | 23.4 |  |  | 8.0 |  |  | 10.0 |  |  | 20,109 |  |  | 18.1 |  |  | 8.0 |  |  | 10.0 |
Tier 1 leverage(5) |  | 19,924 |  |  | 18.3 |  |  | 4.0 |  |  | 5.0 |  |  | 17,883 |  |  | 14.8 |  |  | 4.0 |  |  | 5.0 |
Supplementary leverage(6) |  | 19,924 |  |  | 14.7 |  |  | 3.0 |  |  | N/A |  | 17,883 |  |  | 12.1 |  |  | 3.0 |  |  | N/A
CONA: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity Tier 1 capital(2) |  | 26,671 |  |  | 12.4 |  |  | 4.5 |  |  | 6.5 |  |  | 28,445 |  |  | 13.4 |  |  | 4.5 |  |  | 6.5 |
Tier 1 capital(3) |  | 26,671 |  |  | 12.4 |  |  | 6.0 |  |  | 8.0 |  |  | 28,445 |  |  | 13.4 |  |  | 6.0 |  |  | 8.0 |
Total capital(4) |  | 29,369 |  |  | 13.7 |  |  | 8.0 |  |  | 10.0 |  |  | 30,852 |  |  | 14.5 |  |  | 8.0 |  |  | 10.0 |
Tier 1 leverage(5) |  | 26,671 |  |  | 7.6 |  |  | 4.0 |  |  | 5.0 |  |  | 28,445 |  |  | 9.2 |  |  | 4.0 |  |  | 5.0 |
Supplementary leverage(6) |  | 26,671 |  |  | 6.9 |  |  | 3.0 |  |  | N/A |  | 28,445 |  |  | 8.2 |  |  | 3.0 |  |  | N/A
__________ (1)Capital requirements that are not applicable are denoted by “N/A.” (2)Common equity Tier 1 capital ratio is a regulatory capital measure calculated based on common equity Tier 1 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.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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