$COF
CAPITAL ONE FINANCIAL CORP Stock $cof

$cof Overview Financials Valuation SEC Filings Company Website

2021 Q1 Form 10-Q Financial Statement

#000092762821000175 Filed on May 07, 2021

Income Statement

Concept	2021 Q1	2020 Q1
Revenue	$7.113B	$7.249B
YoY Change	-1.88%	2.34%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development	$302.0M	$302.0M
YoY Change	0.0%	-0.33%
% of Gross Profit
Depreciation & Amortization	$855.0M	$893.0M
YoY Change	-4.26%	26.85%
% of Gross Profit
Operating Expenses	$302.0M	$302.0M
YoY Change	0.0%	-0.33%
Operating Profit
YoY Change
Interest Expense	$439.0M	$1.084B
YoY Change	-59.5%	-16.68%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$4.196B	-$1.903B
YoY Change	-320.49%	-210.7%
Income Tax	$869.0M	-$563.0M
% Of Pretax Income	20.71%
Net Earnings	$3.325B	-$1.340B
YoY Change	-348.13%	-194.9%
Net Earnings / Revenue	46.75%	-18.49%
Basic Earnings Per Share	$7.06	-$3.10
Diluted Earnings Per Share	$7.03	-$3.10
COMMON SHARES
Basic Shares Outstanding	458.6M shares	457.6M shares
Diluted Shares Outstanding	460.1M shares	457.6M shares

Balance Sheet

Concept	2021 Q1	2020 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$52.27B	$25.30B
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$4.277B	$4.336B
YoY Change	-1.36%	3.12%
Goodwill	$14.65B	$14.65B
YoY Change	0.06%	0.68%
Intangibles	$84.00M	$156.0M
YoY Change	-46.15%	-30.04%
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$425.2B	$396.9B
YoY Change	7.13%	6.35%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$288.0M	$359.0M
YoY Change	-19.78%	-6.02%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$842.0M	$6.399B
YoY Change	-86.84%	1810.15%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$288.0M	$359.0M
YoY Change	-19.78%	-83.81%
LONG-TERM LIABILITIES
Long-Term Debt	$37.61B	$49.28B
YoY Change	-23.69%	-1.48%
Other Long-Term Liabilities	$14.92B	$14.32B
YoY Change	4.2%	19.06%
Total Long-Term Liabilities	$52.53B	$63.60B
YoY Change	-17.41%	2.5%
TOTAL LIABILITIES
Total Short-Term Liabilities	$288.0M	$359.0M
Total Long-Term Liabilities	$52.53B	$63.60B
Total Liabilities	$364.0B	$340.0B
YoY Change	7.04%	6.36%
SHAREHOLDERS EQUITY
Retained Earnings	$43.17B	$36.55B
YoY Change	18.1%	-1.29%
Common Stock	$7.000M	$7.000M
YoY Change	0.0%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$61.19B	$56.83B
YoY Change
Total Liabilities & Shareholders Equity	$425.2B	$396.9B
YoY Change	7.13%	6.35%

Cashflow Statement

Concept	2021 Q1	2020 Q1
OPERATING ACTIVITIES
Net Income	$3.325B	-$1.340B
YoY Change	-348.13%	-194.9%
Depreciation, Depletion And Amortization	$855.0M	$893.0M
YoY Change	-4.26%	26.85%
Cash From Operating Activities	$1.636B	$5.409B
YoY Change	-69.75%	10.82%
INVESTING ACTIVITIES
Capital Expenditures	$178.0M	$154.0M
YoY Change	15.58%	-15.85%
Acquisitions
YoY Change
Other Investing Activities	-$52.00M	$196.0M
YoY Change	-126.53%	-53.55%
Cash From Investing Activities	$7.272B	$1.041B
YoY Change	598.56%	-79.23%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$515.0M	$323.0M
YoY Change	59.44%	2384.62%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$2.595B	$5.101B
YoY Change	-49.13%	-229.3%
NET CHANGE
Cash From Operating Activities	$1.636B	$5.409B
Cash From Investing Activities	$7.272B	$1.041B
Cash From Financing Activities	$2.595B	$5.101B
Net Change In Cash	$11.50B	$11.55B
YoY Change	-0.42%	94.17%
FREE CASH FLOW
Cash From Operating Activities	$1.636B	$5.409B
Capital Expenditures	$178.0M	$154.0M
Free Cash Flow	$1.458B	$5.255B
YoY Change	-72.25%	11.86%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021Q1	cof	Depository Share Percent Interestin Preferred Stock DepositorySharePercentInterestinPreferredStock	0.025
CY2021Q1	dei	Amendment Flag AmendmentFlag	false
CY2021Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2021Q1	dei	Entity Central Index Key EntityCentralIndexKey	0000927628
CY2021Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021Q1	dei	Document Type DocumentType	10-Q
CY2021Q1	dei	Document Quarterly Report DocumentQuarterlyReport	true
CY2021Q1	dei	Document Period End Date DocumentPeriodEndDate	2021-03-31
CY2021Q1	dei	Document Period End Date DocumentPeriodEndDate	2021-03-31
CY2021Q1	dei	Document Transition Report DocumentTransitionReport	false
CY2021Q1	dei	Entity File Number EntityFileNumber	001-13300
CY2021Q1	dei	Entity Registrant Name EntityRegistrantName	CAPITAL ONE FINANCIAL CORP
CY2021Q1	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2021Q1	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	54-1719854
CY2021Q1	dei	Entity Address Address Line1 EntityAddressAddressLine1	1680 Capital One Drive,
CY2021Q1	dei	Entity Address City Or Town EntityAddressCityOrTown	McLean,
CY2021Q1	dei	Entity Address State Or Province EntityAddressStateOrProvince	VA
CY2021Q1	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	22102
CY2021Q1	dei	City Area Code CityAreaCode	703
CY2021Q1	dei	Local Phone Number LocalPhoneNumber	720-1000
CY2021Q1	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021Q1	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2021Q1	dei	Entity Small Business EntitySmallBusiness	false
CY2021Q1	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021Q1	dei	Entity Shell Company EntityShellCompany	false
CY2021Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	451489343	shares
CY2021Q1	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	5854000000	USD
CY2020Q1	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	6542000000	USD
CY2021Q1	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	391000000	USD
CY2020Q1	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	530000000	USD
CY2021Q1	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	16000000	USD
CY2020Q1	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	37000000	USD
CY2021Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	6261000000	USD
CY2020Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	7109000000	USD
CY2021Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	269000000	USD
CY2020Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	731000000	USD
CY2021Q1	cof	Interest Expense Secured Debt InterestExpenseSecuredDebt	32000000	USD
CY2020Q1	cof	Interest Expense Secured Debt InterestExpenseSecuredDebt	99000000	USD
CY2021Q1	cof	Interest Expense Unsecured Debt InterestExpenseUnsecuredDebt	129000000	USD
CY2020Q1	cof	Interest Expense Unsecured Debt InterestExpenseUnsecuredDebt	239000000	USD
CY2021Q1	cof	Interest Expense Other Borrowings InterestExpenseOtherBorrowings	9000000	USD
CY2020Q1	cof	Interest Expense Other Borrowings InterestExpenseOtherBorrowings	15000000	USD
CY2021Q1	us-gaap	Interest Expense InterestExpense	439000000	USD
CY2020Q1	us-gaap	Interest Expense InterestExpense	1084000000	USD
CY2021Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	5822000000	USD
CY2020Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	6025000000	USD
CY2021Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-823000000	USD
CY2020Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	5423000000	USD
CY2021Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	6645000000	USD
CY2020Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	602000000	USD
CY2021Q1	cof	Interchange Fees Net InterchangeFeesNet	817000000	USD
CY2020Q1	cof	Interchange Fees Net InterchangeFeesNet	752000000	USD
CY2021Q1	cof	Service Chargesand Other Customer Related Fees ServiceChargesandOtherCustomerRelatedFees	352000000	USD
CY2020Q1	cof	Service Chargesand Other Customer Related Fees ServiceChargesandOtherCustomerRelatedFees	327000000	USD
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CY2020Q1	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	0	USD
CY2021Q1	us-gaap	Noninterest Income Other NoninterestIncomeOther	118000000	USD
CY2020Q1	us-gaap	Noninterest Income Other NoninterestIncomeOther	145000000	USD
CY2021Q1	us-gaap	Noninterest Income NoninterestIncome	1291000000	USD
CY2020Q1	us-gaap	Noninterest Income NoninterestIncome	1224000000	USD
CY2021Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1847000000	USD
CY2020Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1627000000	USD
CY2021Q1	us-gaap	Occupancy Net OccupancyNet	472000000	USD
CY2020Q1	us-gaap	Occupancy Net OccupancyNet	517000000	USD
CY2021Q1	us-gaap	Marketing Expense MarketingExpense	501000000	USD
CY2020Q1	us-gaap	Marketing Expense MarketingExpense	491000000	USD
CY2021Q1	us-gaap	Professional And Contract Services Expense ProfessionalAndContractServicesExpense	292000000	USD
CY2020Q1	us-gaap	Professional And Contract Services Expense ProfessionalAndContractServicesExpense	287000000	USD
CY2021Q1	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	302000000	USD
CY2020Q1	us-gaap	Communications And Information Technology CommunicationsAndInformationTechnology	302000000	USD
CY2021Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6000000	USD
CY2020Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	22000000	USD
CY2021Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	320000000	USD
CY2020Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	483000000	USD
CY2021Q1	us-gaap	Noninterest Expense NoninterestExpense	3740000000	USD
CY2020Q1	us-gaap	Noninterest Expense NoninterestExpense	3729000000	USD
CY2021Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	4196000000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-1903000000	USD
CY2021Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	869000000	USD
CY2020Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-563000000	USD
CY2021Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	3327000000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-1340000000	USD
CY2021Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-2000000	USD
CY2020Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	3325000000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-1340000000	USD
CY2021Q1	cof	Participating Securities Distributedand Undistributed Earnings Lossexcluding Preferred Stock Dividends Basic ParticipatingSecuritiesDistributedandUndistributedEarningsLossexcludingPreferredStockDividendsBasic	28000000	USD
CY2020Q1	cof	Participating Securities Distributedand Undistributed Earnings Lossexcluding Preferred Stock Dividends Basic ParticipatingSecuritiesDistributedandUndistributedEarningsLossexcludingPreferredStockDividendsBasic	3000000	USD
CY2021Q1	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	61000000	USD
CY2020Q1	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	55000000	USD
CY2021Q1	cof	Issuance Cost For Preferred Stock Redeemed IssuanceCostForPreferredStockRedeemed	0	USD
CY2020Q1	cof	Issuance Cost For Preferred Stock Redeemed IssuanceCostForPreferredStockRedeemed	22000000	USD
CY2021Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	3236000000	USD
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CY2021Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	7.06
CY2020Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-3.10
CY2021Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.06
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-3.10
CY2021Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	7.03
CY2020Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-3.10
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.03
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-3.10
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	3325000000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-1340000000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-1148000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	1224000000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-581000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	1374000000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	19000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-67000000	USD
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CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1711000000	USD
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CY2021Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1614000000	USD
CY2020Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1191000000	USD
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CY2021Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	97800000000	USD
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CY2021Q1	us-gaap	Loans Held For Sale Fair Value Disclosure LoansHeldForSaleFairValueDisclosure	908000000	USD
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CY2021Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	4277000000	USD
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CY2021Q1	us-gaap	Interest Receivable InterestReceivable	1380000000	USD
CY2020Q4	us-gaap	Interest Receivable InterestReceivable	1471000000	USD
CY2021Q1	us-gaap	Goodwill Goodwill	14654000000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	14653000000	USD
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CY2020Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	352000000	USD
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CY2020Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	31142000000	USD
CY2021Q1	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	276325000000	USD
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CY2021Q1	us-gaap	Deposits Deposits	310328000000	USD
CY2020Q4	us-gaap	Deposits Deposits	305442000000	USD
CY2021Q1	us-gaap	Secured Debt SecuredDebt	12071000000	USD
CY2020Q4	us-gaap	Secured Debt SecuredDebt	12414000000	USD
CY2021Q1	us-gaap	Federal Funds Purchased And Securities Sold Under Agreements To Repurchase FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	842000000	USD
CY2020Q4	us-gaap	Federal Funds Purchased And Securities Sold Under Agreements To Repurchase FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase	668000000	USD
CY2021Q1	us-gaap	Unsecured Debt UnsecuredDebt	25467000000	USD
CY2020Q4	us-gaap	Unsecured Debt UnsecuredDebt	27382000000	USD
CY2021Q1	us-gaap	Other Borrowings OtherBorrowings	70000000	USD
CY2020Q4	us-gaap	Other Borrowings OtherBorrowings	75000000	USD
CY2021Q1	cof	Debt Excluding Secured Debt DebtExcludingSecuredDebt	26379000000	USD
CY2020Q4	cof	Debt Excluding Secured Debt DebtExcludingSecuredDebt	28125000000	USD
CY2021Q1	us-gaap	Other Liabilities OtherLiabilities	14921000000	USD
CY2020Q4	us-gaap	Other Liabilities OtherLiabilities	15065000000	USD
CY2021Q1	us-gaap	Liabilities Liabilities	363987000000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	361398000000	USD
CY2021Q1	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
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CY2021Q1	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	4975000	shares
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	4975000	shares
CY2021Q1	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
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CY2021Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	682761557	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	679932837	shares
CY2021Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	456800844	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	458972202	shares
CY2021Q1	us-gaap	Common Stock Value CommonStockValue	7000000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	7000000	USD
CY2021Q1	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	33671000000	USD
CY2020Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	33480000000	USD
CY2021Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	43167000000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	40088000000	USD
CY2021Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	1783000000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	3494000000	USD
CY2020Q4	cof	Treasury Stock Par Or Stated Value Per Share TreasuryStockParOrStatedValuePerShare	0.01
CY2021Q1	cof	Treasury Stock Par Or Stated Value Per Share TreasuryStockParOrStatedValuePerShare	0.01
CY2021Q1	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	225960713	shares
CY2020Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	220960635	shares
CY2021Q1	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	17440000000	USD
CY2020Q4	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	16865000000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	61188000000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	421602000000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	60204000000	USD
CY2021Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1614000000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	60204000000	USD
CY2021Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	425175000000	USD
CY2021Q1	us-gaap	Dividends Common Stock DividendsCommonStock	184000000	USD
CY2021Q1	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	61000000	USD
CY2021Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	575000000	USD
CY2021Q1	cof	Stock Issued During Period Value New Issuesand Restricted Stock Netof Forfeitures StockIssuedDuringPeriodValueNewIssuesandRestrictedStockNetofForfeitures	60000000	USD
CY2021Q1	cof	Stock Issued During Period Value Stock Optionsand Warrants Exercisedand Restricted Stock Vesting StockIssuedDuringPeriodValueStockOptionsandWarrantsExercisedandRestrictedStockVesting	19000000	USD
CY2021Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	111000000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	61188000000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	58011000000	USD
CY2020Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1191000000	USD
CY2020Q1	us-gaap	Dividends Common Stock DividendsCommonStock	185000000	USD
CY2020Q1	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	55000000	USD
CY2020Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	386000000	USD
CY2020Q1	cof	Stock Issued During Period Value New Issuesand Restricted Stock Netof Forfeitures StockIssuedDuringPeriodValueNewIssuesandRestrictedStockNetofForfeitures	63000000	USD
CY2020Q1	cof	Stock Issued During Period Value Stock Optionsand Warrants Exercisedand Restricted Stock Vesting StockIssuedDuringPeriodValueStockOptionsandWarrantsExercisedandRestrictedStockVesting	20000000	USD
CY2020Q1	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1209000000	USD
CY2020Q1	us-gaap	Stock Redeemed Or Called During Period Value StockRedeemedOrCalledDuringPeriodValue	875000000	USD
CY2020Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	29000000	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	56830000000	USD
CY2020Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2021Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2021Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	3327000000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-1340000000	USD
CY2021Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-2000000	USD
CY2020Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	3325000000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-1340000000	USD
CY2021Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-823000000	USD
CY2020Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	5423000000	USD
CY2021Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	855000000	USD
CY2020Q1	us-gaap	Depreciation And Amortization DepreciationAndAmortization	893000000	USD
CY2021Q1	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	345000000	USD
CY2020Q1	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-748000000	USD
CY2021Q1	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	4000000	USD
CY2020Q1	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	0	USD
CY2021Q1	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	5000000	USD
CY2020Q1	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	4000000	USD
CY2021Q1	us-gaap	Share Based Compensation ShareBasedCompensation	119000000	USD
CY2020Q1	us-gaap	Share Based Compensation ShareBasedCompensation	24000000	USD
CY2021Q1	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-66000000	USD
CY2020Q1	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	0	USD
CY2021Q1	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	1914000000	USD
CY2020Q1	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	2258000000	USD
CY2021Q1	us-gaap	Proceeds From Sale And Collection Of Loans Heldforsale ProceedsFromSaleAndCollectionOfLoansHeldforsale	1651000000	USD
CY2020Q1	us-gaap	Proceeds From Sale And Collection Of Loans Heldforsale ProceedsFromSaleAndCollectionOfLoansHeldforsale	1507000000	USD
CY2021Q1	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-91000000	USD
CY2020Q1	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-71000000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1570000000	USD
CY2020Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-1325000000	USD
CY2021Q1	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-64000000	USD
CY2020Q1	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-80000000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-435000000	USD
CY2020Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	595000000	USD
CY2021Q1	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-1000000	USD
CY2020Q1	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	1000000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1636000000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	5409000000	USD
CY2021Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	7881000000	USD
CY2020Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	3927000000	USD
CY2021Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	7015000000	USD
CY2020Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	3822000000	USD
CY2021Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	595000000	USD
CY2020Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	144000000	USD
CY2021Q1	cof	Payments For Proceeds From Sale Of Financing Receivable Held For Investment PaymentsForProceedsFromSaleOfFinancingReceivableHeldForInvestment	-7055000000	USD
CY2020Q1	cof	Payments For Proceeds From Sale Of Financing Receivable Held For Investment PaymentsForProceedsFromSaleOfFinancingReceivableHeldForInvestment	-686000000	USD
CY2021Q1	us-gaap	Proceeds From Recoveries Of Loan Previously Charged Off ProceedsFromRecoveriesOfLoanPreviouslyChargedOff	614000000	USD
CY2020Q1	us-gaap	Proceeds From Recoveries Of Loan Previously Charged Off ProceedsFromRecoveriesOfLoanPreviouslyChargedOff	666000000	USD
CY2021Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	178000000	USD
CY2020Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	154000000	USD
CY2021Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-52000000	USD
CY2020Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	196000000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	7272000000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	1041000000	USD
CY2021Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	4938000000	USD
CY2020Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	6702000000	USD
CY2021Q1	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	0	USD
CY2020Q1	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	1248000000	USD
CY2021Q1	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	271000000	USD
CY2020Q1	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	2208000000	USD
CY2021Q1	cof	Proceedsfrom Issuanceof Unsecured Debtand Long Term Fhlb Advances Netof Issuance Cost ProceedsfromIssuanceofUnsecuredDebtandLongTermFHLBAdvancesNetofIssuanceCost	0	USD
CY2020Q1	cof	Proceedsfrom Issuanceof Unsecured Debtand Long Term Fhlb Advances Netof Issuance Cost ProceedsfromIssuanceofUnsecuredDebtandLongTermFHLBAdvancesNetofIssuanceCost	1995000000	USD
CY2021Q1	cof	Repaymentsof Unsecured Debtand Long Term Fhlb Advances RepaymentsofUnsecuredDebtandLongTermFHLBAdvances	1500000000	USD
CY2020Q1	cof	Repaymentsof Unsecured Debtand Long Term Fhlb Advances RepaymentsofUnsecuredDebtandLongTermFHLBAdvances	1500000000	USD
CY2021Q1	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	169000000	USD
CY2020Q1	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-927000000	USD
CY2021Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	60000000	USD
CY2020Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	63000000	USD
CY2021Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	184000000	USD
CY2020Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	185000000	USD
CY2021Q1	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	0	USD
CY2020Q1	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	1209000000	USD
CY2021Q1	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	61000000	USD
CY2020Q1	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	55000000	USD
CY2021Q1	cof	Payments For Redemption Of Preferred Stock PaymentsForRedemptionOfPreferredStock	0	USD
CY2020Q1	cof	Payments For Redemption Of Preferred Stock PaymentsForRedemptionOfPreferredStock	875000000	USD
CY2021Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	575000000	USD
CY2020Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	386000000	USD
CY2021Q1	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	19000000	USD
CY2020Q1	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	20000000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2595000000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	5101000000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	11503000000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	11551000000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	40771000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	13749000000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	52274000000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	25300000000	USD
CY2021Q1	cof	Transfer Of To Portfolio Financing Receivables To From Held For Sale TransferOfToPortfolioFinancingReceivablesToFromHeldForSale	160000000	USD
CY2020Q1	cof	Transfer Of To Portfolio Financing Receivables To From Held For Sale TransferOfToPortfolioFinancingReceivablesToFromHeldForSale	-73000000	USD
CY2021Q1	us-gaap	Interest Paid Net InterestPaidNet	637000000	USD
CY2020Q1	us-gaap	Interest Paid Net InterestPaidNet	1157000000	USD
CY2021Q1	us-gaap	Income Taxes Paid IncomeTaxesPaid	111000000	USD
CY2020Q1	us-gaap	Income Taxes Paid IncomeTaxesPaid	64000000	USD
CY2021Q1	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	segment
CY2021Q1	us-gaap	Use Of Estimates UseOfEstimates	The preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and in the related disclosures. These estimates are based on information available as of the date of the consolidated financial statements. While management makes its best judgments, actual amounts or results could differ from these estimates. In the opinion of management, all normal, recurring adjustments have been included for a fair statement of this interim financial information.<span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%"> </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Certain prior period amounts have been reclassified to conform to the current period presentation.</span>
CY2021Q1	us-gaap	Debt Securities Available For Sale Change In Present Value Interest Income DebtSecuritiesAvailableForSaleChangeInPresentValueInterestIncome	237000000	USD
CY2020	us-gaap	Debt Securities Available For Sale Change In Present Value Interest Income DebtSecuritiesAvailableForSaleChangeInPresentValueInterestIncome	230000000	USD
CY2021Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	97802000000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	2000000	USD
CY2021Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	2204000000	USD
CY2021Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	839000000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	99165000000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	97569000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	1000000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	2997000000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	120000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	100445000000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	35491000000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	789000000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	1714000000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	50000000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	37205000000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	839000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	9095000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	64000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	2059000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	55000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	11154000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	119000000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	540	security
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	320	security
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Fair Value AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	952000000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	14293000000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	6538000000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue	77382000000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	99165000000	USD
CY2021Q1	us-gaap	Financing Receivable Accrued Interest Before Allowance For Credit Loss FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss	1100000000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	949000000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis	14206000000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis	6411000000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis	76236000000	USD
CY2021Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	97802000000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Maturity Rolling Within One Year Weighted Average Yield DebtSecuritiesAvailableForSaleMaturityRollingWithinOneYearWeightedAverageYield	0.0097
CY2021Q1	us-gaap	Debt Securities Available For Sale Maturity Rolling After One Through Five Years Weighted Average Yield DebtSecuritiesAvailableForSaleMaturityRollingAfterOneThroughFiveYearsWeightedAverageYield	0.0052
CY2021Q1	us-gaap	Debt Securities Available For Sale Maturity Rolling After Five Through Ten Years Weighted Average Yield DebtSecuritiesAvailableForSaleMaturityRollingAfterFiveThroughTenYearsWeightedAverageYield	0.0162
CY2021Q1	us-gaap	Debt Securities Available For Sale Maturity Rolling After10 Years Weighted Average Yield DebtSecuritiesAvailableForSaleMaturityRollingAfter10YearsWeightedAverageYield	0.0180
CY2021Q1	cof	Debt Securities Available For Sale Weighted Average Yield DebtSecuritiesAvailableForSaleWeightedAverageYield	0.0159
CY2021Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	595000000	USD
CY2020Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	144000000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	4000000	USD
CY2020Q1	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	1000000	USD
CY2020Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	1000000	USD
CY2021Q1	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	1000000	USD
CY2020Q4	us-gaap	Financing Receivable Accrued Interest Before Allowance For Credit Loss FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss	1200000000	USD
CY2021Q1	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	238321000000	USD
CY2021Q1	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	4810000000	USD
CY2021Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	243131000000	USD
CY2021Q1	cof	Financing Receivable Percent Current FinancingReceivablePercentCurrent	0.9802
CY2021Q1	us-gaap	Financing Receivable Percent Past Due1 FinancingReceivablePercentPastDue1	0.0198
CY2021Q1	cof	Financing Receivable Percentageof Total Loan FinancingReceivablePercentageofTotalLoan	1.0000
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	245060000000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	6564000000	USD
CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	251624000000	USD
CY2020Q4	cof	Financing Receivable Percent Current FinancingReceivablePercentCurrent	0.9739
CY2020Q4	us-gaap	Financing Receivable Percent Past Due1 FinancingReceivablePercentPastDue1	0.0261
CY2020Q4	cof	Financing Receivable Percentageof Total Loan FinancingReceivablePercentageofTotalLoan	1.0000
CY2020Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	1100000000	USD
CY2021Q1	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	1100000000	USD
CY2021Q1	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	1207000000	USD
CY2021Q1	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	924000000	USD
CY2021Q1	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	485000000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	1302000000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	995000000	USD
CY2020Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	449000000	USD
CY2021Q1	cof	Financing Receivable Percent90 Days Past Dueand Still Accruing FinancingReceivablePercent90DaysPastDueandStillAccruing	0.005
CY2021Q1	us-gaap	Financing Receivable Nonaccrual Percent Past Due1 FinancingReceivableNonaccrualPercentPastDue1	0.004
CY2021Q1	cof	Financing Receivable Nonaccrual No Allowance Percent Past Due FinancingReceivableNonaccrualNoAllowancePercentPastDue	0.002
CY2020Q4	cof	Financing Receivable Percent90 Days Past Dueand Still Accruing FinancingReceivablePercent90DaysPastDueandStillAccruing	0.005
CY2020Q4	us-gaap	Financing Receivable Nonaccrual Percent Past Due1 FinancingReceivableNonaccrualPercentPastDue1	0.004
CY2020Q4	cof	Financing Receivable Nonaccrual No Allowance Percent Past Due FinancingReceivableNonaccrualNoAllowancePercentPastDue	0.002
CY2021Q1	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	1000000	USD
CY2020Q1	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	2000000	USD
CY2021Q1	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	2000000000.0	USD
CY2020Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	2100000000	USD
CY2021Q1	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	178000000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	173000000	USD
CY2021Q1	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	262000000	USD
CY2020Q1	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	292000000	USD
CY2021Q1	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	24372	contract
CY2021Q1	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	67000000	USD
CY2020Q1	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	30025	contract
CY2020Q1	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	92000000	USD
CY2021Q1	us-gaap	Variable Interest Entity Entity Maximum Loss Exposure Amount VariableInterestEntityEntityMaximumLossExposureAmount	5087000000	USD
CY2020Q4	us-gaap	Variable Interest Entity Entity Maximum Loss Exposure Amount VariableInterestEntityEntityMaximumLossExposureAmount	5038000000	USD
CY2021Q1	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	156000000	USD
CY2020Q1	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	139000000	USD
CY2021Q1	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	258000000	USD
CY2020Q1	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	155000000	USD
CY2021Q1	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	4600000000	USD
CY2020Q4	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	4500000000	USD
CY2021Q1	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	1500000000	USD
CY2020Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	1500000000	USD
CY2021Q1	us-gaap	Goodwill Gross GoodwillGross	14654000000	USD
CY2021Q1	us-gaap	Goodwill Goodwill	14654000000	USD
CY2021Q1	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	331000000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	247000000	USD
CY2021Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	84000000	USD
CY2021Q1	cof	Intangible Assets Gross Including Goodwill IntangibleAssetsGrossIncludingGoodwill	14985000000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	247000000	USD
CY2021Q1	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	14738000000	USD
CY2021Q1	cof	Mortgage Servicing Assetat Amortized Cost Gross MortgageServicingAssetatAmortizedCostGross	562000000	USD
CY2021Q1	cof	Servicing Assetat Amortized Cost Accumulated Amortization ServicingAssetatAmortizedCostAccumulatedAmortization	183000000	USD
CY2021Q1	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	379000000	USD
CY2020Q4	us-gaap	Goodwill Gross GoodwillGross	14653000000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	14653000000	USD
CY2020Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	396000000	USD
CY2020Q4	cof	Mortgage Servicing Assetat Amortized Cost Gross MortgageServicingAssetatAmortizedCostGross	542000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	306000000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	90000000	USD
CY2020Q4	cof	Intangible Assets Gross Including Goodwill IntangibleAssetsGrossIncludingGoodwill	15049000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	306000000	USD
CY2020Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	14743000000	USD
CY2020Q4	cof	Servicing Assetat Amortized Cost Accumulated Amortization ServicingAssetatAmortizedCostAccumulatedAmortization	175000000	USD
CY2020Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	367000000	USD
CY2021Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6000000	USD
CY2020Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	22000000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	14653000000	USD
CY2021Q1	us-gaap	Goodwill Other Increase Decrease GoodwillOtherIncreaseDecrease	1000000	USD
CY2021Q1	us-gaap	Goodwill Goodwill	14654000000	USD
CY2021Q1	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	34003000000	USD
CY2020Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	31142000000	USD
CY2021Q1	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	276325000000	USD
CY2020Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	274300000000	USD
CY2021Q1	us-gaap	Deposits Deposits	310328000000	USD
CY2020Q4	us-gaap	Deposits Deposits	305442000000	USD
CY2021Q1	us-gaap	Short Term Borrowings ShortTermBorrowings	842000000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	668000000	USD
CY2021Q1	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	37608000000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	39871000000	USD
CY2021Q1	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	38450000000	USD
CY2020Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	40539000000	USD
CY2021Q1	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	3000000000.0	USD
CY2020Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	4200000000	USD
CY2021Q1	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	231927000000	USD
CY2021Q1	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	2869000000	USD
CY2021Q1	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	1651000000	USD
CY2020Q4	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	232327000000	USD
CY2020Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	3415000000	USD
CY2020Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	1518000000	USD
CY2021Q1	us-gaap	Derivative Asset Fair Value Gross Liability And Obligation To Return Cash Offset DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset	844000000	USD
CY2021Q1	us-gaap	Derivative Liability Fair Value Gross Asset And Right To Reclaim Cash Offset DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset	679000000	USD
CY2020Q4	us-gaap	Derivative Asset Fair Value Gross Liability And Obligation To Return Cash Offset DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset	1148000000	USD
CY2020Q4	us-gaap	Derivative Liability Fair Value Gross Asset And Right To Reclaim Cash Offset DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset	739000000	USD
CY2021Q1	us-gaap	Derivative Assets DerivativeAssets	2025000000	USD
CY2021Q1	us-gaap	Derivative Liabilities DerivativeLiabilities	972000000	USD
CY2020Q4	us-gaap	Derivative Assets DerivativeAssets	2267000000	USD
CY2020Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	779000000	USD
CY2021Q1	cof	Derivative Credit Risk Valuation Adjustment Derivative Assets Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeAssetsLiabilities	26000000	USD
CY2020Q4	cof	Derivative Credit Risk Valuation Adjustment Derivative Assets Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeAssetsLiabilities	31000000	USD
CY2021Q1	us-gaap	Hedged Asset Discontinued Fair Value Hedge Cumulative Increase Decrease HedgedAssetDiscontinuedFairValueHedgeCumulativeIncreaseDecrease	249000000	USD
CY2021Q1	us-gaap	Prepayable Financial Asset Closed Portfolio Last Of Layer Amortized Cost PrepayableFinancialAssetClosedPortfolioLastOfLayerAmortizedCost	225000000	USD
CY2021Q1	us-gaap	Hedged Asset Fair Value Hedge Cumulative Increase Decrease HedgedAssetFairValueHedgeCumulativeIncreaseDecrease	-1000000	USD
CY2021Q1	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	2869000000	USD
CY2021Q1	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	369000000	USD
CY2021Q1	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	475000000	USD
CY2021Q1	us-gaap	Derivative Assets DerivativeAssets	2025000000	USD
CY2021Q1	us-gaap	Derivative Asset Fair Value Of Collateral DerivativeAssetFairValueOfCollateral	0	USD
CY2021Q1	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	2025000000	USD
CY2020Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	3415000000	USD
CY2020Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	383000000	USD
CY2020Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	765000000	USD
CY2020Q4	us-gaap	Derivative Assets DerivativeAssets	2267000000	USD
CY2020Q4	us-gaap	Derivative Asset Fair Value Of Collateral DerivativeAssetFairValueOfCollateral	0	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	2267000000	USD
CY2021Q1	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	1651000000	USD
CY2021Q1	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	369000000	USD
CY2021Q1	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	310000000	USD
CY2021Q1	us-gaap	Derivative Liabilities DerivativeLiabilities	972000000	USD
CY2021Q1	us-gaap	Derivative Liability Fair Value Of Collateral DerivativeLiabilityFairValueOfCollateral	0	USD
CY2021Q1	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	972000000	USD
CY2021Q1	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	842000000	USD
CY2021Q1	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	0	USD
CY2021Q1	cof	Repurchase Agreement Collateral Right To Reclaim Cash Offset RepurchaseAgreementCollateralRightToReclaimCashOffset	0	USD
CY2021Q1	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	842000000	USD
CY2021Q1	us-gaap	Securities Sold Under Agreements To Repurchase Collateral Right To Reclaim Securities SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities	842000000	USD
CY2021Q1	us-gaap	Securities Sold Under Agreements To Repurchase Amount Offset Against Collateral SecuritiesSoldUnderAgreementsToRepurchaseAmountOffsetAgainstCollateral	0	USD
CY2020Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	1518000000	USD
CY2020Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	383000000	USD
CY2020Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	356000000	USD
CY2020Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	779000000	USD
CY2020Q4	us-gaap	Derivative Liability Fair Value Of Collateral DerivativeLiabilityFairValueOfCollateral	0	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	779000000	USD
CY2020Q4	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	668000000	USD
CY2020Q4	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	0	USD
CY2020Q4	cof	Repurchase Agreement Collateral Right To Reclaim Cash Offset RepurchaseAgreementCollateralRightToReclaimCashOffset	0	USD
CY2020Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	668000000	USD
CY2020Q4	us-gaap	Securities Sold Under Agreements To Repurchase Collateral Right To Reclaim Securities SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities	668000000	USD
CY2020Q4	us-gaap	Securities Sold Under Agreements To Repurchase Amount Offset Against Collateral SecuritiesSoldUnderAgreementsToRepurchaseAmountOffsetAgainstCollateral	0	USD
CY2021Q1	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	562000000	USD
CY2020Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	862000000	USD
CY2020Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	1000000	USD
CY2021Q1	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	1000000	USD
CY2021Q1	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	1700000000	USD
CY2020Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	1500000000	USD
CY2021Q1	us-gaap	Securities Sold Under Agreements To Repurchase Fair Value Of Collateral SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral	859000000	USD
CY2020Q4	us-gaap	Securities Sold Under Agreements To Repurchase Fair Value Of Collateral SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral	682000000	USD
CY2021Q1	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	391000000	USD
CY2021Q1	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	5854000000	USD
CY2021Q1	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	16000000	USD
CY2021Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	269000000	USD
CY2021Q1	cof	Interest Expense Secured Debt InterestExpenseSecuredDebt	32000000	USD
CY2021Q1	cof	Interest Expense Unsecured Debt InterestExpenseUnsecuredDebt	129000000	USD
CY2021Q1	us-gaap	Noninterest Income Other NoninterestIncomeOther	118000000	USD
CY2020Q1	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	530000000	USD
CY2020Q1	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	6542000000	USD
CY2020Q1	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	37000000	USD
CY2020Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	731000000	USD
CY2020Q1	cof	Interest Expense Secured Debt InterestExpenseSecuredDebt	99000000	USD
CY2020Q1	cof	Interest Expense Unsecured Debt InterestExpenseUnsecuredDebt	239000000	USD
CY2020Q1	us-gaap	Noninterest Income Other NoninterestIncomeOther	145000000	USD
CY2021Q1	cof	Amortization Of Basis Adjustment AmortizationOfBasisAdjustment	-22000000	USD
CY2020Q1	cof	Amortization Of Basis Adjustment AmortizationOfBasisAdjustment	36000000	USD
CY2021Q1	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	575000000	USD
CY2021Q1	us-gaap	Maximum Length Of Time Hedged In Cash Flow Hedge1 MaximumLengthOfTimeHedgedInCashFlowHedge1	P7Y
CY2021Q1	us-gaap	Preferred Stock Including Additional Paid In Capital Net Of Discount PreferredStockIncludingAdditionalPaidInCapitalNetOfDiscount	4847000000	USD
CY2020Q4	us-gaap	Preferred Stock Including Additional Paid In Capital Net Of Discount PreferredStockIncludingAdditionalPaidInCapitalNetOfDiscount	4847000000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	-1512000000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-364000000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-1148000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	1610000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	386000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	1224000000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-766000000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-185000000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-581000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	1808000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	434000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	1374000000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent	13000000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Foreign Currency Translation Adjustment Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent	-6000000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	19000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToParent	-21000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Foreign Currency Translation Adjustment Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent	46000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-67000000	USD
CY2021Q1	cof	Other Comprehensive Income Loss Before Tax Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxAttributableToParent	-1000000	USD
CY2021Q1	cof	Other Comprehensive Income Loss Other Tax Attributable To Parent OtherComprehensiveIncomeLossOtherTaxAttributableToParent	0	USD
CY2021Q1	cof	Other Comprehensive Income Other Net Of Tax Attributable To Parent OtherComprehensiveIncomeOtherNetOfTaxAttributableToParent	-1000000	USD
CY2020Q1	cof	Other Comprehensive Income Loss Before Tax Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxAttributableToParent	0	USD
CY2020Q1	cof	Other Comprehensive Income Loss Other Tax Attributable To Parent OtherComprehensiveIncomeLossOtherTaxAttributableToParent	0	USD
CY2020Q1	cof	Other Comprehensive Income Other Net Of Tax Attributable To Parent OtherComprehensiveIncomeOtherNetOfTaxAttributableToParent	0	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-2266000000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-555000000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1711000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	3397000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	866000000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	2531000000	USD
CY2021Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	3327000000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-1340000000	USD
CY2021Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-2000000	USD
CY2020Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	3325000000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-1340000000	USD
CY2021Q1	cof	Participating Securities Distributedand Undistributed Earnings Lossexcluding Preferred Stock Dividends Basic ParticipatingSecuritiesDistributedandUndistributedEarningsLossexcludingPreferredStockDividendsBasic	28000000	USD
CY2020Q1	cof	Participating Securities Distributedand Undistributed Earnings Lossexcluding Preferred Stock Dividends Basic ParticipatingSecuritiesDistributedandUndistributedEarningsLossexcludingPreferredStockDividendsBasic	3000000	USD
CY2021Q1	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	61000000	USD
CY2020Q1	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	55000000	USD
CY2021Q1	cof	Issuance Cost For Preferred Stock Redeemed IssuanceCostForPreferredStockRedeemed	0	USD
CY2020Q1	cof	Issuance Cost For Preferred Stock Redeemed IssuanceCostForPreferredStockRedeemed	22000000	USD
CY2021Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	3236000000	USD
CY2020Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-1420000000	USD
CY2021Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	458600000	shares
CY2020Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	457600000	shares
CY2021Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	800000	shares
CY2020Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2021Q1	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	700000	shares
CY2020Q1	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	0	shares
CY2021Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1500000	shares
CY2020Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2021Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	460100000	shares
CY2020Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	457600000	shares
CY2021Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	7.06
CY2020Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-3.10
CY2021Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.06
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-3.10
CY2021Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	7.03
CY2020Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-3.10
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.03
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-3.10
CY2021Q1	us-gaap	Derivative Asset Fair Value Gross Liability And Obligation To Return Cash Offset DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset	844000000	USD
CY2021Q1	us-gaap	Derivative Asset Fair Value Gross Liability And Obligation To Return Cash Offset DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset	844000000	USD
CY2021Q1	us-gaap	Derivative Liability Fair Value Gross Asset And Right To Reclaim Cash Offset DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset	679000000	USD
CY2021Q1	us-gaap	Derivative Liability Fair Value Gross Asset And Right To Reclaim Cash Offset DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset	679000000	USD
CY2020Q4	us-gaap	Derivative Asset Fair Value Gross Liability And Obligation To Return Cash Offset DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset	1148000000	USD
CY2020Q4	us-gaap	Derivative Asset Fair Value Gross Liability And Obligation To Return Cash Offset DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset	1148000000	USD
CY2020Q4	us-gaap	Derivative Liability Fair Value Gross Asset And Right To Reclaim Cash Offset DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset	739000000	USD
CY2020Q4	us-gaap	Derivative Liability Fair Value Gross Asset And Right To Reclaim Cash Offset DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset	739000000	USD
CY2021Q1	cof	Derivative Credit Risk Valuation Adjustment Derivative Assets Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeAssetsLiabilities	26000000	USD
CY2020Q4	cof	Derivative Credit Risk Valuation Adjustment Derivative Assets Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeAssetsLiabilities	31000000	USD
CY2021Q1	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	segment
CY2021Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	5822000000	USD
CY2021Q1	us-gaap	Noninterest Income NoninterestIncome	1291000000	USD
CY2021Q1	us-gaap	Revenues Revenues	7113000000	USD
CY2021Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-823000000	USD
CY2021Q1	us-gaap	Noninterest Expense NoninterestExpense	3740000000	USD
CY2021Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	4196000000	USD
CY2021Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	869000000	USD
CY2021Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	3327000000	USD
CY2021Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	243131000000	USD
CY2021Q1	us-gaap	Deposits Deposits	310328000000	USD
CY2020Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	6025000000	USD
CY2020Q1	us-gaap	Noninterest Income NoninterestIncome	1224000000	USD
CY2020Q1	us-gaap	Revenues Revenues	7249000000	USD
CY2020Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	5423000000	USD
CY2020Q1	us-gaap	Noninterest Expense NoninterestExpense	3729000000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-1903000000	USD
CY2020Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-563000000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-1340000000	USD
CY2020Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	262990000000	USD
CY2020Q1	us-gaap	Deposits Deposits	269689000000	USD
CY2021Q1	cof	Uncollectible Portionof Billed Finance Chargesand Fees UncollectiblePortionofBilledFinanceChargesandFees	180000000	USD
CY2020Q1	cof	Uncollectible Portionof Billed Finance Chargesand Fees UncollectiblePortionofBilledFinanceChargesandFees	389000000	USD
CY2021Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1001000000	USD
CY2021Q1	cof	Noninterest Income Excluding Revenuefrom Contractwith Customer NoninterestIncomeExcludingRevenuefromContractwithCustomer	290000000	USD
CY2021Q1	us-gaap	Noninterest Income NoninterestIncome	1291000000	USD
CY2020Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	937000000	USD
CY2020Q1	cof	Noninterest Income Excluding Revenuefrom Contractwith Customer NoninterestIncomeExcludingRevenuefromContractwithCustomer	287000000	USD
CY2020Q1	us-gaap	Noninterest Income NoninterestIncome	1224000000	USD
CY2021Q1	cof	Letterof Credit Issued Contractual Amountand Unused Commitmentto Extend Credit LetterofCreditIssuedContractualAmountandUnusedCommitmenttoExtendCredit	392310000000	USD
CY2020Q4	cof	Letterof Credit Issued Contractual Amountand Unused Commitmentto Extend Credit LetterofCreditIssuedContractualAmountandUnusedCommitmenttoExtendCredit	386732000000	USD
CY2021Q1	cof	Off Balance Sheet Lending Commitment Carrying Value OffBalanceSheetLendingCommitmentCarryingValue	168000000	USD
CY2020Q4	cof	Off Balance Sheet Lending Commitment Carrying Value OffBalanceSheetLendingCommitmentCarryingValue	176000000	USD
CY2021Q1	us-gaap	Loss Contingency Estimate Of Possible Loss LossContingencyEstimateOfPossibleLoss	250000000	USD

Files In Submission

Name	View Source	Status
0000927628-21-000175-index-headers.html	Edgar Link	pending
0000927628-21-000175-index.html	Edgar Link	pending
0000927628-21-000175.txt	Edgar Link	pending
0000927628-21-000175-xbrl.zip	Edgar Link	pending
cof-03312021x10qxex311.htm	Edgar Link	pending
cof-03312021x10qxex312.htm	Edgar Link	pending
cof-03312021x10qxex321.htm	Edgar Link	pending
cof-03312021x10qxex322.htm	Edgar Link	pending
cof-20210331.htm	Edgar Link	pending
cof-20210331.xsd	Edgar Link	pending
cof-20210331_cal.xml	Edgar Link	unprocessable
cof-20210331_def.xml	Edgar Link	unprocessable
cof-20210331_htm.xml	Edgar Link	completed
cof-20210331_lab.xml	Edgar Link	unprocessable
cof-20210331_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
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Show.js	Edgar Link	pending

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$COF
CAPITAL ONE FINANCIAL CORP Stock $cof

2021 Q1 Form 10-Q Financial Statement

#000092762821000175 Filed on May 07, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$COF CAPITAL ONE FINANCIAL CORP Stock $cof

2021 Q1 Form 10-Q Financial Statement

#000092762821000175 Filed on May 07, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$COF
CAPITAL ONE FINANCIAL CORP Stock $cof