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Commitments, Contingencies, Guarantees, and Others - Litigation (Details) (USD $)
1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Jan. 31, 2014
claim
Dec. 31, 2013
claim
Jul. 31, 2012
Mar. 31, 2008
Apr. 30, 2014
patent
Feb. 28, 2009
Contract
MortgageLoan
Jul. 31, 2012
summon
trust
Mar. 31, 2015
Jul. 31, 2013
Loss Contingencies [Line Items]                  
Loss contingency, estimate of possible loss               $ 200,000,000us-gaap_LossContingencyEstimateOfPossibleLoss  
Interchange Litigation                  
Loss Contingencies [Line Items]                  
Indemnification guarantees fair value               0cof_IndemnificationGuaranteesFairValueDisclosure
/ us-gaap_LitigationCaseAxis
= cof_InterchangeLitigationMember
 
Intellectual Ventures Corp                  
Loss Contingencies [Line Items]                  
Number of claims dismissed 1us-gaap_LossContingencyClaimsDismissedNumber
/ us-gaap_LitigationCaseAxis
= cof_IntellectualVenturesCorpMember
2us-gaap_LossContingencyClaimsDismissedNumber
/ us-gaap_LitigationCaseAxis
= cof_IntellectualVenturesCorpMember
             
Pending Litigation | Interchange Litigation                  
Loss Contingencies [Line Items]                  
Litigation settlement, attributable to reporting entity and third party     6,600,000,000cof_LitigationSettlementAmountAttributabletoReportingEntityandThirdParty
/ us-gaap_LitigationCaseAxis
= cof_InterchangeLitigationMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
           
Litigation settlement, attributable to reporting entity and third party, percent of transactions     0.10%cof_LitigationSettlementAttributabletoReportingEntityandThirdPartyPercentofTransactions
/ us-gaap_LitigationCaseAxis
= cof_InterchangeLitigationMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
           
Litigation settlement, attributable to reporting entity and third party, period of payment of settlement     8 months            
Loss accrual increase (decrease)       (91,000,000)us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease
/ us-gaap_LitigationCaseAxis
= cof_InterchangeLitigationMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
         
Pending Litigation | Intellectual Ventures Corp                  
Loss Contingencies [Line Items]                  
Number of patents not infringed   1us-gaap_LossContingencyPatentsFoundNotInfringedNumber
/ us-gaap_LitigationCaseAxis
= cof_IntellectualVenturesCorpMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
    2us-gaap_LossContingencyPatentsFoundNotInfringedNumber
/ us-gaap_LitigationCaseAxis
= cof_IntellectualVenturesCorpMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
       
GreenPoint Subsidiary | Pending Litigation | U.S. Bank Litigation                  
Loss Contingencies [Line Items]                  
Number of contracts breached           2cof_LitigationNumberofContractsBreached
/ dei_LegalEntityAxis
= cof_GreenPointSubsidiaryMember
/ us-gaap_LitigationCaseAxis
= cof_UsBankLitigationMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
     
Number of mortgage loans sold to third party under litigation           30,000cof_LitigationNumberofMortgageLoansSoldtoThirdPartyUnderLitigation
/ dei_LegalEntityAxis
= cof_GreenPointSubsidiaryMember
/ us-gaap_LitigationCaseAxis
= cof_UsBankLitigationMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
     
Mortgage loans sold to third party, face amount under litigation           1,800,000,000cof_MortgageLoansonRealEstateSoldtoThirdPartyFaceAmountUnderLitigation
/ dei_LegalEntityAxis
= cof_GreenPointSubsidiaryMember
/ us-gaap_LitigationCaseAxis
= cof_UsBankLitigationMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
     
GreenPoint Subsidiary | Pending Litigation | FHFA Litigation                  
Loss Contingencies [Line Items]                  
Mortgage loans sold to third party, face amount under litigation     3,400,000,000cof_MortgageLoansonRealEstateSoldtoThirdPartyFaceAmountUnderLitigation
/ dei_LegalEntityAxis
= cof_GreenPointSubsidiaryMember
/ us-gaap_LitigationCaseAxis
= cof_FHFALitigationMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
      3,400,000,000cof_MortgageLoansonRealEstateSoldtoThirdPartyFaceAmountUnderLitigation
/ dei_LegalEntityAxis
= cof_GreenPointSubsidiaryMember
/ us-gaap_LitigationCaseAxis
= cof_FHFALitigationMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
   
Number of summons filed             3cof_LitigationNumberofSummonsFiled
/ dei_LegalEntityAxis
= cof_GreenPointSubsidiaryMember
/ us-gaap_LitigationCaseAxis
= cof_FHFALitigationMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
   
Number of residential mortgage backed securities trusts             3cof_LitigationNumberofResidentialMortgageBackedSecuritiesTrusts
/ dei_LegalEntityAxis
= cof_GreenPointSubsidiaryMember
/ us-gaap_LitigationCaseAxis
= cof_FHFALitigationMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
   
GreenPoint Subsidiary | Pending Litigation | LXS Trust Litigation                  
Loss Contingencies [Line Items]                  
Mortgage loans sold to third party, face amount under litigation                 $ 915,000,000cof_MortgageLoansonRealEstateSoldtoThirdPartyFaceAmountUnderLitigation
/ dei_LegalEntityAxis
= cof_GreenPointSubsidiaryMember
/ us-gaap_LitigationCaseAxis
= cof_LXSTrustLitigationMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember