XML 54 R43.htm IDEA: XBRL DOCUMENT
v3.21.1

Loans - Credit Card Delinquency Status (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Income (loss) from continuing operations before income taxes | $ 243,131 | $ 251,624 | $ 262,990
Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 98,548 | 106,323 |
Revolving Loans Converted to Term | 579 | 633 |
Income (loss) from continuing operations before income taxes | 99,127 | 106,956 |
Domestic credit card: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 90,609 | 97,969 |
Revolving Loans Converted to Term | 490 | 535 |
Income (loss) from continuing operations before income taxes | 91,099 | 98,504 |
International card businesses: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 7,939 | 8,354 |
Revolving Loans Converted to Term | 89 | 98 |
Income (loss) from continuing operations before income taxes | 8,028 | 8,452 |
Current | Domestic credit card: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 88,609 | 95,629 |
Revolving Loans Converted to Term | 450 | 487 |
Income (loss) from continuing operations before income taxes | 89,059 | 96,116 |
Current | International card businesses: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 7,753 | 8,152 |
Revolving Loans Converted to Term | 66 | 66 |
Income (loss) from continuing operations before income taxes | 7,819 | 8,218 |
30-59 days | Domestic credit card: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 511 | 734 |
Revolving Loans Converted to Term | 16 | 21 |
Income (loss) from continuing operations before income taxes | 527 | 755 |
30-59 days | International card businesses: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 63 | 79 |
Revolving Loans Converted to Term | 8 | 11 |
Income (loss) from continuing operations before income taxes | 71 | 90 |
60-89 days | Domestic credit card: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 382 | 451 |
Revolving Loans Converted to Term | 11 | 13 |
Income (loss) from continuing operations before income taxes | 393 | 464 |
60-89 days | International card businesses: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 40 | 47 |
Revolving Loans Converted to Term | 7 | 11 |
Income (loss) from continuing operations before income taxes | 47 | 58 |
Greater than 90 days | Domestic credit card: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 1,107 | 1,155 |
Revolving Loans Converted to Term | 13 | 14 |
Income (loss) from continuing operations before income taxes | 1,120 | 1,169 |
Greater than 90 days | International card businesses: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 83 | 76 |
Revolving Loans Converted to Term | 8 | 10 |
Income (loss) from continuing operations before income taxes | $ 91 | $ 86 |

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of financing receivable that can be withdrawn, repaid and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableRevolving
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of revolving financing receivable converted to term loan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL120270059-210447 + Details
Name: | us-gaap_FinancingReceivableRevolvingConvertedToTermLoan
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448 + Details
Name: | us-gaap_NotesReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=cof_CreditCardPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GeographicDistributionAxis=us-gaap_GeographicDistributionDomesticMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GeographicDistributionAxis=us-gaap_GeographicDistributionForeignMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=cof_FinancialAssetCurrentAndLessThan30DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |