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Regulatory and Capital Adequacy - Capital Ratios Under Basel III (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2022 USD ($)
Common equity Tier 1 capital: |  |
Common equity Tier 1 capital | $ 43,501 | $ 44,731
Common equity Tier 1 capital, capital ratio | 0.131 | 0.125
Common equity Tier 1 capital, minimum capital adequacy | 0.045 | 0.045
Tier 1 risk-based capital: |  |
Tier 1 capital | $ 48,346 | $ 49,576
Tier 1 capital, capital ratio | 0.145 | 0.139
Tier 1 capital, minimum capital adequacy | 0.060 | 0.060
Tier 1 capital, well-capitalized | 0.060 | 0.060
Total risk-based capital: |  |
Total capital | $ 56,089 | $ 56,714
Total capital, capital ratio | 0.169 | 0.158
Total capital, minimum capital adequacy | 0.080 | 0.080
Total capital, well-capitalized | 0.100 | 0.100
Tier 1 leverage capital: |  |
Tier 1 leverage capital | $ 48,346 | $ 49,576
Tier 1 leverage, capital ratio | 0.116 | 0.111
Tier 1 leverage, minimum capital adequacy | 0.040 | 0.040
Supplementary leverage: |  |
Tier one capital under BaselIII standardized approach | $ 48,346 | $ 49,576
Basel III Supplementary Leverage Ratio | 0.099 | 0.095
Supplementary leverage | 0.030 | 0.030
Regulatory Capital Adjustments, Net of Tax, CECL Transition | $ 2,400 |
Common Equity Tier One Capital Ratio, Excluding CECL Transition Adjustment |  | 12.00%
Common Equity Tier One Capital Ratio, CECL Transition |  | 12.50%
Capital One, N.A. |  |
Common equity Tier 1 capital: |  |
Common equity Tier 1 capital | $ 26,699 | $ 46,630
Common equity Tier 1 capital, capital ratio | 0.111 | 0.131
Common equity Tier 1 capital, minimum capital adequacy | 0.045 | 0.045
Common equity Tie 1 capital, well capitalized | 0.065 | 0.065
Tier 1 risk-based capital: |  |
Tier 1 capital | $ 26,699 | $ 46,630
Tier 1 capital, capital ratio | 0.111 | 0.131
Tier 1 capital, minimum capital adequacy | 0.060 | 0.060
Tier 1 capital, well-capitalized | 0.080 | 0.080
Total risk-based capital: |  |
Total capital | $ 29,449 | $ 51,165
Total capital, capital ratio | 0.122 | 0.144
Total capital, minimum capital adequacy | 0.080 | 0.080
Total capital, well-capitalized | 0.100 | 0.100
Tier 1 leverage capital: |  |
Tier 1 leverage capital | $ 26,699 | $ 46,630
Tier 1 leverage, capital ratio | 0.074 | 0.105
Tier 1 leverage, minimum capital adequacy | 0.040 | 0.040
Tier 1 leverage, well-capitalized | 0.050 | 0.050
Supplementary leverage: |  |
Tier one capital under BaselIII standardized approach | $ 26,699 | $ 46,630
Basel III Supplementary Leverage Ratio | 0.066 | 0.090
Supplementary leverage | 0.030 | 0.030

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