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Regulatory and Capital Adequacy - Additional Information (Details) |  | 12 Months Ended | 36 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2022 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Common equity Tier 1 capital |  | $ 43,501,000,000 |  | $ 44,731,000,000
Common equity Tier 1 capital, capital ratio |  | 0.131 |  | 0.125
Regulatory Capital Adjustments, Net of Tax, CECL Transition |  | $ 2,400,000,000 |  |
Common Equity Tier One Capital Ratio, CECL Transition |  |  |  | 12.50%
Common Equity Tier One Capital Ratio, Excluding CECL Transition Adjustment |  |  |  | 12.00%
Regulatory Capital Adjustments, Net of Tax, CECL Transition, Phased in Amount | $ 599,000,000 |  |  |
Forecast |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Regulatory Capital Adjustments, Net of Tax, CECL Transition, Phased in Amount |  |  | $ 1,800,000,000 |
Capital One Bank (USA), N.A. |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Funds available for dividend payments |  |  |  | $ 3,200,000,000
Capital One, N.A. |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Common equity Tier 1 capital |  | $ 26,699,000,000 |  | $ 46,630,000,000
Common equity Tier 1 capital, capital ratio |  | 0.111 |  | 0.131

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- Definition Common Equity Tier One Capital Ratio, Excluding CECL Transition Adjustment + References No definition available. + Details
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- Definition Common equity Tier 1 capital ratio is a regulatory capital measure under Basel III calculated based on common equity Tier 1 capital divided by risk-weighted assets. + References No definition available. + Details
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- Definition Amount of Common Equity Tier 1 risk-based capital as defined by regulatory framework. + References Reference 1: 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 https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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