XML 129 R99.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Derivative Instruments and Hedging Activities - Gains Losses on Freestanding Derivatives (Details) - Other non-interest income - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other non-interest income: | $ 324 | $ 141 | $ 50
Interest rate contracts: |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other non-interest income: | 89 | 103 | 67
Interest rate contracts: | Customer accommodation: |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other non-interest income: | 34 | 40 | 32
Interest rate contracts: | Other interest rate exposures |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other non-interest income: | 264 | 76 | (5)
Commodity contracts | Customer accommodation: |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other non-interest income: | 39 | 49 | 28
Foreign exchange and other contracts | Customer accommodation: |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other non-interest income: | 16 | 14 | 7
Other contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other non-interest income: | $ (29) | $ (38) | $ (12)

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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4E + Details
Name: | us-gaap_DerivativeInstrumentsGainLossLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4CC + Details
Name: | us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=cof_OtherNonInterestIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=cof_CustomerAccommodationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=cof_OtherInterestRateExposuresMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CommodityContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_OtherContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |