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Capital One Financial Corporation (Parent Company Only) - Balance Sheets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Assets: |  |  |  |
Cash and cash equivalents | $ 40,509 | $ 13,407 |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 100,445 | 79,213 |  |
Other assets | 21,205 | 17,613 |  |
Total assets | 421,602 | 390,365 |  |
Liabilities: |  |  |  |
Senior and subordinated notes | 27,382 | 30,472 |  |
Accrued expenses and other liabilities | 15,065 | 13,521 |  |
Total liabilities | 361,398 | 332,354 |  |
Stockholders’ equity: |  |  |  |
Total stockholders’ equity | 60,204 | 58,011 | $ 51,668 | $ 48,730
Total liabilities and stockholders’ equity | 421,602 | 390,365 |  |
Parent Company |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 12,976 | 13,050 |  |
Investments in subsidiaries | 62,066 | 61,626 |  |
Loans to subsidiaries | 5,924 | 3,905 |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 622 | 738 |  |
Other assets | 1,473 | 1,017 |  |
Total assets | 83,061 | 80,336 |  |
Liabilities: |  |  |  |
Senior and subordinated notes | 22,037 | 22,080 |  |
Accrued expenses and other liabilities | 820 | 245 |  |
Total liabilities | 22,857 | 22,325 |  |
Stockholders’ equity: |  |  |  |
Total stockholders’ equity | 60,204 | 58,011 |  |
Total liabilities and stockholders’ equity | $ 83,061 | $ 80,336 |  |

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