$DFS
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2020 Q4 Form 10-K Financial Statement

#000139361221000014 Filed on February 17, 2021

Income Statement

Concept	2020 Q4	2019 Q4	2019 Q3
Revenue	$2.760B	$3.039B	$3.040B
YoY Change	-9.18%	4.54%	9.31%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development			$96.00M
YoY Change			7.87%
% of Gross Profit
Depreciation & Amortization	$123.0M	$121.0M	$113.0M
YoY Change	1.65%	11.01%	2.73%
% of Gross Profit
Operating Expenses			$96.00M
YoY Change			7.87%
Operating Profit
YoY Change
Interest Expense	$383.0M	$615.0M	$638.0M
YoY Change	-37.72%	1.65%	14.34%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$1.015B	$924.0M	$994.0M
YoY Change	9.85%	3.01%	2.79%
Income Tax	$216.0M	$216.0M	$224.0M
% Of Pretax Income	21.28%	23.38%	22.54%
Net Earnings	$799.0M	$708.0M	$770.0M
YoY Change	12.85%	3.06%	6.94%
Net Earnings / Revenue	28.95%	23.3%	25.33%
Basic Earnings Per Share	$2.59	$2.25	$2.36
Diluted Earnings Per Share	$2.59	$2.25	$2.36
COMMON SHARES
Basic Shares Outstanding	306.5M shares	313.5M shares	317.0M shares
Diluted Shares Outstanding			317.0M shares

Balance Sheet

Concept	2020 Q4	2019 Q4	2019 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$23.48B	$17.52B	$16.72B
YoY Change	34.01%	5.1%	-6.15%
Cash & Equivalents	$13.56B	$6.924B	$6.075B
Short-Term Investments	$9.914B	$10.60B	$10.65B
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$1.027B	$1.057B	$1.028B
YoY Change	-2.84%	12.93%	14.73%
Goodwill	$255.0M	$255.0M	$255.0M
YoY Change	0.0%	0.0%	0.0%
Intangibles	$95.00M	$155.0M	$159.0M
YoY Change	-38.71%	-3.73%	-1.85%
Long-Term Investments	$353.0M	$336.0M	$321.0M
YoY Change	5.06%	13.9%	22.05%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$112.9B	$114.0B	$110.8B
YoY Change	-0.97%	4.06%	4.67%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$3.860B	$3.690B	$3.594B
YoY Change	4.61%	7.39%	-13.48%
Deferred Revenue
YoY Change
Short-Term Debt
YoY Change
Long-Term Debt Due	$4.217B	$5.247B	$200.0M
YoY Change	-19.63%	-19.41%	-87.09%
Total Short-Term Liabilities	$8.077B	$8.937B	$3.794B
YoY Change	-9.62%	-10.15%	-33.47%
LONG-TERM LIABILITIES
Long-Term Debt	$17.02B	$20.45B	$24.25B
YoY Change	-16.77%	-1.27%	-4.7%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$17.02B	$20.45B	$24.25B
YoY Change	-16.77%	-1.27%	-4.7%
TOTAL LIABILITIES
Total Short-Term Liabilities	$8.077B	$8.937B	$3.794B
Total Long-Term Liabilities	$17.02B	$20.45B	$24.25B
Total Liabilities	$102.0B	$102.1B	$99.07B
YoY Change	-0.13%	3.77%	4.47%
SHAREHOLDERS EQUITY
Retained Earnings	$19.96B	$21.29B	$20.72B
YoY Change	-6.27%	12.61%	12.89%
Common Stock	$6.000M	$6.000M	$6.000M
YoY Change	0.0%	0.0%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$14.44B	$14.09B	$13.69B
YoY Change	2.47%	14.35%	15.45%
Treasury Stock Shares	261.3M shares	256.5M shares	251.6M shares
Shareholders Equity	$10.88B	$11.86B	$11.72B
YoY Change
Total Liabilities & Shareholders Equity	$112.9B	$114.0B	$110.8B
YoY Change	-0.97%	4.06%	4.67%

Cashflow Statement

Concept	2020 Q4	2019 Q4	2019 Q3
OPERATING ACTIVITIES
Net Income	$799.0M	$708.0M	$770.0M
YoY Change	12.85%	3.06%	6.94%
Depreciation, Depletion And Amortization	$123.0M	$121.0M	$113.0M
YoY Change	1.65%	11.01%	2.73%
Cash From Operating Activities	$1.633B	$1.464B	$819.0M
YoY Change	11.54%	92.38%	-49.0%
INVESTING ACTIVITIES
Capital Expenditures	-$55.00M	-$72.00M	-$61.00M
YoY Change	-23.61%	-6.49%	3.39%
Acquisitions
YoY Change
Other Investing Activities	$3.751B	-$2.983B	-$5.969B
YoY Change	-225.75%	-48.0%	100.5%
Cash From Investing Activities	$3.696B	-$3.055B	-$6.030B
YoY Change	-220.98%	-47.45%	98.62%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-1.829B	2.443B	-30.00M
YoY Change	-174.87%	-31.93%	-101.42%
NET CHANGE
Cash From Operating Activities	1.633B	1.464B	819.0M
Cash From Investing Activities	3.696B	-3.055B	-6.030B
Cash From Financing Activities	-1.829B	2.443B	-30.00M
Net Change In Cash	3.500B	852.0M	-5.241B
YoY Change	310.8%	-158.2%	-859.57%
FREE CASH FLOW
Cash From Operating Activities	$1.633B	$1.464B	$819.0M
Capital Expenditures	-$55.00M	-$72.00M	-$61.00M
Free Cash Flow	$1.688B	$1.536B	$880.0M
YoY Change	9.9%	83.29%	-47.15%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0001393612
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	001-33378
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Riverwoods
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	IL
CY2020	dei	Entity Registrant Name EntityRegistrantName	DISCOVER FINANCIAL SERVICES
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	36-2517428
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	2500 Lake Cook Road
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	60015
CY2020	dei	City Area Code CityAreaCode	224
CY2020	dei	Local Phone Number LocalPhoneNumber	405-0900
CY2020	dei	Security12b Title Security12bTitle	Common Stock, par value $0.01 per share
CY2020	dei	Trading Symbol TradingSymbol	DFS
CY2020	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
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CY2020	dei	Entity Shell Company EntityShellCompany	false
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CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	9.09
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.81
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.60
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	9.08
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.79
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1141000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	2957000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	2742000000	USD
CY2020	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	172000000	USD
CY2019	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	102000000	USD
CY2018	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	16000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	5000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-39000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	9000000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	13000000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	26000000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	164000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	37000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	25000000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1305000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2994000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2767000000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	10892000000	USD
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Reclassification From Aoci To Retained Earnings Tax Effect TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect	0	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	2742000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	25000000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	2065000000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	6000000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	82000000	USD
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.50
CY2018	us-gaap	Dividends Common Stock DividendsCommonStock	521000000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	11130000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	2957000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	37000000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1768000000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	7000000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	69000000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.68
CY2019	us-gaap	Dividends Common Stock DividendsCommonStock	542000000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	11859000000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1141000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	164000000	USD
CY2020	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	348000000	USD
CY2020	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	10000000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	41000000	USD
CY2020	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	493000000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.76
CY2020	us-gaap	Dividends Common Stock DividendsCommonStock	543000000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	10884000000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1141000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	2957000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	2742000000	USD
CY2020	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	5134000000	USD
CY2019	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3231000000	USD
CY2018	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3035000000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-672000000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-133000000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-190000000	USD
CY2020	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	485000000	USD
CY2019	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	436000000	USD
CY2018	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	435000000	USD
CY2020	dfs	Amortizationofdeferredrevenuesandaccretionofaccretableyieldonacquiredloans Amortizationofdeferredrevenuesandaccretionofaccretableyieldonacquiredloans	320000000	USD
CY2019	dfs	Amortizationofdeferredrevenuesandaccretionofaccretableyieldonacquiredloans Amortizationofdeferredrevenuesandaccretionofaccretableyieldonacquiredloans	421000000	USD
CY2018	dfs	Amortizationofdeferredrevenuesandaccretionofaccretableyieldonacquiredloans Amortizationofdeferredrevenuesandaccretionofaccretableyieldonacquiredloans	403000000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	26000000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-37000000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-45000000	USD
CY2020	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	200000000	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	82000000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	83000000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-118000000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	202000000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	7000000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	136000000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	209000000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-549000000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	6196000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	6196000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	5191000000	USD
CY2020	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	5850000000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	1000000000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	0	USD
CY2020	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	8046000000	USD
CY2019	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	1000000000	USD
CY2018	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	0	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	1007000000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	140000000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	838000000	USD
CY2020	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	113000000	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	7183000000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	2554000000	USD
CY2020	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	54000000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	31000000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	18000000	USD
CY2020	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	44000000	USD
CY2019	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	66000000	USD
CY2018	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	82000000	USD
CY2020	us-gaap	Payments For Proceeds From Loans Receivable PaymentsForProceedsFromLoansReceivable	-3045000000	USD
CY2019	us-gaap	Payments For Proceeds From Loans Receivable PaymentsForProceedsFromLoansReceivable	7844000000	USD
CY2018	us-gaap	Payments For Proceeds From Loans Receivable PaymentsForProceedsFromLoansReceivable	8480000000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	94000000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	0	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	0	USD
CY2020	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	72000000	USD
CY2019	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	68000000	USD
CY2018	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	65000000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	261000000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	284000000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	254000000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	1514000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-15274000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-10579000000	USD
CY2020	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	3519000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	4766000000	USD
CY2020	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	3531000000	USD
CY2019	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	6287000000	USD
CY2018	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	4447000000	USD
CY2020	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	494000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1340000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	2233000000	USD
CY2020	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	1755000000	USD
CY2019	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	286000000	USD
CY2018	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	1756000000	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	10000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	7000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	6000000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	348000000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1768000000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2065000000	USD
CY2020	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	4128000000	USD
CY2019	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	4945000000	USD
CY2018	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	8961000000	USD
CY2020	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	493000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	0	USD
CY2020	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	576000000	USD
CY2019	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	573000000	USD
CY2018	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	552000000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1085000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	897000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	7146000000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	6625000000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-8181000000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	1758000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6964000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	15145000000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	13387000000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	13589000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6964000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	15145000000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	13564000000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	6924000000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	13299000000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	25000000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	40000000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	1846000000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	13589000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6964000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	15145000000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	1799000000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	2407000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	1847000000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	901000000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1088000000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	650000000	USD
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2020	us-gaap	Use Of Estimates UseOfEstimates	The preparation of financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and related disclosures. These estimates are based on information available as of the date of the consolidated financial statements. The Company believes that the estimates used in the preparation of the consolidated financial statements are reasonable. Actual results could differ from these estimates.
CY2020	dfs	Consolidation Percentage ConsolidationPercentage	0.50
CY2020	dfs	Consolidation Percentage ConsolidationPercentage	0.50
CY2020	dfs	Cost Method Ownership Percentage CostMethodOwnershipPercentage	0.20
CY2020Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	1100000000	USD
CY2019Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	959000000	USD
CY2020Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	12500000000	USD
CY2019Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	6000000000.0	USD
CY2020	dfs	Bankruptcy And Probate Charge Off Period BankruptcyAndProbateChargeOffPeriod	P60D
CY2020	dfs	Fraudulent Transaction Charge Off Period FraudulentTransactionChargeOffPeriod	P90D
CY2020Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	0	USD
CY2020Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	0	USD
CY2020	us-gaap	Advertising Expense AdvertisingExpense	212000000	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	264000000	USD
CY2018	us-gaap	Advertising Expense AdvertisingExpense	258000000	USD
CY2020	us-gaap	Revenue Recognition Interest RevenueRecognitionInterest	<div style="margin-bottom:5pt;margin-top:15pt"><span style="color:#000000;font-family:'Futura LT Medium',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Significant Revenue Recognition Accounting Policies </span></div><div style="margin-bottom:5pt;margin-top:5pt"><span style="color:#000000;font-family:'Futura LT Medium',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Loan Interest and Fee Income</span></div><div style="margin-bottom:10pt;text-indent:27pt"><span style="color:#000000;font-family:'Futura LT Medium',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Interest on loans is comprised largely of interest on credit card loans and is recognized based on the amount of loans outstanding and their contractual interest rate. Interest on credit card loans is included in loan receivables when billed to the customer. The Company accrues unbilled interest revenue each month from a customer’s billing cycle date to the end of the month. The Company applies an estimate of the percentage of loans that will revolve in the next cycle in the estimation of the accrued unbilled portion of interest revenue that is included in accrued interest receivable on the consolidated statements of financial condition. Interest on other loan receivables is accrued each month in accordance with their contractual terms and recorded in accrued interest receivable, which is included in other assets in the consolidated statements of financial condition.</span></div><div style="margin-bottom:10pt;text-indent:27pt"><span style="color:#000000;font-family:'Futura LT Medium',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company recognizes fees (except balance transfer fees and certain product fees) on loan receivables in interest income or loan fee income as the fees are assessed. Balance transfer fees and certain product fees are recognized in interest income or loan fee income ratably over the periods to which they relate. Balance transfer fees are accreted to interest income over the estimated life of the related balance. As of December 31, 2020 and 2019, deferred revenues related to balance transfer fees, recorded as a reduction of loan receivables, were $62 million and $67 million, respectively. Loan fee income consists of fees on credit card loans and includes late, cash advance, returned check and other miscellaneous fees and is reflected net of waivers and charge-offs.</span></div><div style="margin-bottom:10pt;text-indent:27pt"><span style="color:#000000;font-family:'Futura LT Medium',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Direct loan origination costs on credit card loans are deferred and amortized on a straight-line basis over a one year period and recorded in interest income from credit card loans. Direct loan origination costs on other loan receivables are deferred and amortized over the life of the loan using the interest method and are recorded in interest income from other loans. As of December 31, 2020 and 2019, the remaining unamortized deferred costs related to loan origination were $157 million and $178 million, respectively, and were recorded in loan receivables. </span></div><div style="margin-bottom:10pt;text-indent:27pt"><span style="color:#000000;font-family:'Futura LT Medium',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company accrues interest and fees on loan receivables until the loans are paid or charged off, except in instances of customer bankruptcy, death or fraud, where no further interest and fee accruals occur following notification. Credit card and closed-end consumer loan receivables are placed on non-accrual status upon receipt of notification of the bankruptcy or death of a customer or suspected fraudulent activity on an account. Upon completion of the fraud investigation, non-fraudulent credit card and closed-end consumer loan receivables may resume accruing interest. Payments received on non-accrual loans are allocated according to the same payment hierarchy applied to loans that are accruing interest. When loan receivables are charged off, unpaid accrued interest and fees are reversed against the income line items in which they were originally recorded in the consolidated statements of income. Charge-offs and recoveries of amounts that relate to capitalized interest on private student loans are treated as principal </span></div><div style="margin-bottom:10pt"><span style="color:#000000;font-family:'Futura LT Medium',sans-serif;font-size:10pt;font-weight:400;line-height:120%">charge-offs and recoveries, affecting the provision for credit losses rather than interest income. The Company considers uncollectible interest and fee revenues in assessing the adequacy of the allowance for credit losses. </span></div><div style="text-indent:27pt"><span style="color:#000000;font-family:'Futura LT Medium',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Interest income from loans accounted for as troubled debt restructurings is accounted for in the same manner as other accruing loans. Cash collections on these loans are allocated according to the same payment hierarchy methodology applied to loans that are not in such programs.</span></div>
CY2020Q4	us-gaap	Deferred Discounts Finance Charges And Interest Included In Receivables DeferredDiscountsFinanceChargesAndInterestIncludedInReceivables	62000000	USD
CY2019Q4	us-gaap	Deferred Discounts Finance Charges And Interest Included In Receivables DeferredDiscountsFinanceChargesAndInterestIncludedInReceivables	67000000	USD
CY2020Q4	us-gaap	Deferred Costs Credit Card Origination Costs Amount DeferredCostsCreditCardOriginationCostsAmount	157000000	USD
CY2019Q4	us-gaap	Deferred Costs Credit Card Origination Costs Amount DeferredCostsCreditCardOriginationCostsAmount	178000000	USD
CY2020	dfs	Credit Card Rewards Cost Adjusted For Estimated Forfeitures CreditCardRewardsCostAdjustedForEstimatedForfeitures	1900000000	USD
CY2019	dfs	Credit Card Rewards Cost Adjusted For Estimated Forfeitures CreditCardRewardsCostAdjustedForEstimatedForfeitures	1900000000	USD
CY2018	dfs	Credit Card Rewards Cost Adjusted For Estimated Forfeitures CreditCardRewardsCostAdjustedForEstimatedForfeitures	1800000000	USD
CY2019Q4	dfs	Credit Card Rewards Liability Net CreditCardRewardsLiabilityNet	1700000000	USD
CY2020Q4	dfs	Credit Card Rewards Liability Net CreditCardRewardsLiabilityNet	1700000000	USD
CY2020Q4	dfs	Unamortrized Deferred Incentive Payments UnamortrizedDeferredIncentivePayments	33000000	USD
CY2019Q4	dfs	Unamortrized Deferred Incentive Payments UnamortrizedDeferredIncentivePayments	24000000	USD
CY2020Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	2200000000	USD
CY2019Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	0	USD
CY2020Q4	us-gaap	Marketable Securities MarketableSecurities	9914000000	USD
CY2019Q4	us-gaap	Marketable Securities MarketableSecurities	10595000000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	9277000000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	377000000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	0	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9654000000	USD
CY2020Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	260000000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	9000000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	0	USD
CY2020Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	269000000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	10173000000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	158000000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	8000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	10323000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	272000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	3000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	1000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	274000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	0	securities
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	USD
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	USD
CY2018	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	2633000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	6399000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	235000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	10000000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	9277000000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	0	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	0	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	0	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	260000000	USD
CY2020Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	260000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	2661000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	6740000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	243000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	10000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9654000000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	0	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	0	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	0	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	269000000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	269000000	USD
CY2020Q4	dfs	Available For Sale Securities Debt Maturities Within One Year Percentage AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearPercentage	0.0191
CY2020Q4	dfs	Available For Sale Securities Debt Maturities After One Year Through Five Years Percentage AvailableForSaleSecuritiesDebtMaturitiesAfterOneYearThroughFiveYearsPercentage	0.0224
CY2020Q4	dfs	Available For Sale Securities Debt Maturities After Ten Years Percentage AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsPercentage	0.0099
CY2020Q4	dfs	Available For Sale Securities Debt Maturities After Five Years Through Ten Years Percentage AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsThroughTenYearsPercentage	0.0207
CY2020Q4	dfs	Available For Sale Securities Debt Maturities Percentage AvailableForSaleSecuritiesDebtMaturitiesPercentage	0.0214
CY2020Q4	dfs	Held To Maturity Securities Debt Maturities Within One Year Percentage HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearPercentage	0
CY2020Q4	dfs	Held To Maturity Securities Debt Maturities After One Year Through Five Years Percentage HeldToMaturitySecuritiesDebtMaturitiesAfterOneYearThroughFiveYearsPercentage	0
CY2020Q4	dfs	Held To Maturity Securities Debt Maturities After Five Years Though Ten Years Percentage HeldToMaturitySecuritiesDebtMaturitiesAfterFiveYearsThoughTenYearsPercentage	0
CY2020Q4	dfs	Held To Maturity Securities Debt Maturities After Ten Years Percentage HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsPercentage	0.0313
CY2020Q4	dfs	Held To Maturity Securities Debt Maturities Percentage HeldToMaturitySecuritiesDebtMaturitiesPercentage	0.0313
CY2020	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	252000000	USD
CY2019	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	179000000	USD
CY2018	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	40000000	USD
CY2018	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	0	USD
CY2019	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	0	USD
CY2020	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	0	USD
CY2020	dfs	Loan Portfolio Segments LoanPortfolioSegments	2	segment
CY2020	dfs	Loan Portfolio Segments LoanPortfolioSegments	2	segment
CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	90449000000	USD
CY2019Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	95894000000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	8226000000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	3383000000	USD
CY2020Q4	us-gaap	Notes Receivable Net NotesReceivableNet	82223000000	USD
CY2019Q4	us-gaap	Notes Receivable Net NotesReceivableNet	92511000000	USD
CY2020Q4	dfs	Revolving Lineof Credit Arrangement Convertedto Term Loanthrough Loan Modification Program Ending Balance RevolvingLineofCreditArrangementConvertedtoTermLoanthroughLoanModificationProgramEndingBalance	1000000000.0	USD
CY2019Q4	dfs	Revolving Lineof Credit Arrangement Convertedto Term Loanthrough Loan Modification Program Ending Balance RevolvingLineofCreditArrangementConvertedtoTermLoanthroughLoanModificationProgramEndingBalance	956000000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	3383000000	USD
CY2020Q1	dfs	Cumulative Effectof Asu No.201613 Adoption CumulativeEffectofASUNo.201613Adoption	2461000000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	5844000000	USD
CY2020	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	5117000000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	3476000000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	741000000	USD
CY2020	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	17000000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	2735000000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	8226000000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	3041000000	USD
CY2019	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	3231000000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	3617000000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	731000000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	2886000000	USD
CY2019	dfs	Financing Receivable Allowancefor Credit Loss Other Adjustment FinancingReceivableAllowanceforCreditLossOtherAdjustment	-3000000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	3383000000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	2621000000	USD
CY2018	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	3035000000	USD
CY2018	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	3182000000	USD
CY2018	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	570000000	USD
CY2018	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	2612000000	USD
CY2018	dfs	Financing Receivable Allowancefor Credit Loss Other Adjustment FinancingReceivableAllowanceforCreditLossOtherAdjustment	-3000000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	3041000000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	2300000000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	8200000000	USD
CY2020Q4	dfs	Expected Future Peak Unemployment Rate ExpectedFuturePeakUnemploymentRate	0.087
CY2020Q4	dfs	Expected Future Unemployment Rate ExpectedFutureUnemploymentRate	0.082
CY2020Q4	dfs	Expected Future Increasein Gdp ExpectedFutureIncreaseinGDP	0.027
CY2020Q3	dfs	Financing Receivable Allowancefor Credit Loss Reasonableand Supportable Forecast Period FinancingReceivableAllowanceforCreditLossReasonableandSupportableForecastPeriod	P18M
CY2020Q2	dfs	Financing Receivable Allowancefor Credit Loss Reasonableand Supportable Forecast Period FinancingReceivableAllowanceforCreditLossReasonableandSupportableForecastPeriod	P18M
CY2020Q4	dfs	Financing Receivable Allowancefor Credit Loss Reasonableand Supportable Forecast Period FinancingReceivableAllowanceforCreditLossReasonableandSupportableForecastPeriod	P18M
CY2020Q1	dfs	Financing Receivable Allowancefor Credit Loss Reasonableand Supportable Forecast Period FinancingReceivableAllowanceforCreditLossReasonableandSupportableForecastPeriod	P12M
CY2020Q3	dfs	Financing Receivable Allowancefor Credit Loss Reasonableand Supportable Forecast Period FinancingReceivableAllowanceforCreditLossReasonableandSupportableForecastPeriod	P18M
CY2020Q2	dfs	Financing Receivable Allowancefor Credit Loss Reasonableand Supportable Forecast Period FinancingReceivableAllowanceforCreditLossReasonableandSupportableForecastPeriod	P18M
CY2020Q4	dfs	Financing Receivable Allowancefor Credit Loss Reasonableand Supportable Forecast Period FinancingReceivableAllowanceforCreditLossReasonableandSupportableForecastPeriod	P18M
CY2020	dfs	Financing Receivable Allowancefor Credit Loss Reversion Period FinancingReceivableAllowanceforCreditLossReversionPeriod	P12M
CY2020	dfs	Interest And Fees Accrued Subsequently Charged Off Net Of Recoveries InterestAndFeesAccruedSubsequentlyChargedOffNetOfRecoveries	484000000	USD
CY2019	dfs	Interest And Fees Accrued Subsequently Charged Off Net Of Recoveries InterestAndFeesAccruedSubsequentlyChargedOffNetOfRecoveries	515000000	USD
CY2018	dfs	Interest And Fees Accrued Subsequently Charged Off Net Of Recoveries InterestAndFeesAccruedSubsequentlyChargedOffNetOfRecoveries	442000000	USD
CY2020	dfs	Fees Accrued Subsequently Charged Off Net Of Recoveries FeesAccruedSubsequentlyChargedOffNetOfRecoveries	117000000	USD
CY2019	dfs	Fees Accrued Subsequently Charged Off Net Of Recoveries FeesAccruedSubsequentlyChargedOffNetOfRecoveries	123000000	USD
CY2018	dfs	Fees Accrued Subsequently Charged Off Net Of Recoveries FeesAccruedSubsequentlyChargedOffNetOfRecoveries	109000000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	1705000000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	737000000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	243000000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	2312000000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	1014000000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	266000000	USD
CY2020	dfs	Percentage Of Defaulted Loans That Charged Off PercentageOfDefaultedLoansThatChargedOff	0.53
CY2019	dfs	Percentage Of Defaulted Loans That Charged Off PercentageOfDefaultedLoansThatChargedOff	0.38
CY2018	dfs	Percentage Of Defaulted Loans That Charged Off PercentageOfDefaultedLoansThatChargedOff	0.36
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2737000000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2668000000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1027000000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1057000000	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	98000000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	84000000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	75000000	USD
CY2020	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	100000000	USD
CY2019	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	80000000	USD
CY2018	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	67000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	77000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	74000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	3000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	77000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	73000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	4000000	USD
CY2020Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	92000000	USD
CY2020Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	92000000	USD
CY2019Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	151000000	USD
CY2019Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	151000000	USD
CY2020Q4	dfs	Intangible Assets Gross Carrying Amount IntangibleAssetsGrossCarryingAmount	169000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	74000000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	95000000	USD
CY2019Q4	dfs	Intangible Assets Gross Carrying Amount IntangibleAssetsGrossCarryingAmount	228000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	73000000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	155000000	USD
CY2020	dfs	Deposits Source Channels DepositsSourceChannels	2	channels
CY2020Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	19105000000	USD
CY2019Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	25113000000	USD
CY2020Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	9164000000	USD
CY2019Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	9268000000	USD
CY2020Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	47426000000	USD
CY2019Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	37574000000	USD
CY2020Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	75695000000	USD
CY2019Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	71955000000	USD
CY2019Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	2600000000	USD
CY2020Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	2600000000	USD
CY2020Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Three Months Or Less ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsOrLess	2461000000	USD
CY2020Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Three Months Through Six Months ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsThroughSixMonths	1669000000	USD
CY2020Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More Six Months Through12 Months ContractualMaturitiesTimeDeposits100000OrMoreSixMonthsThrough12Months	2883000000	USD
CY2020Q4	us-gaap	Contractual Maturities Time Deposits100000 Or More After12 Months ContractualMaturitiesTimeDeposits100000OrMoreAfter12Months	2151000000	USD
CY2020Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	9164000000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	17850000000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	4520000000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	2259000000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	1363000000	USD
CY2020Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	866000000	USD
CY2020Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	1411000000	USD
CY2020Q4	us-gaap	Time Deposits TimeDeposits	28269000000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	21241000000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	25701000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	4217000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	5201000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	3402000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	2625000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	533000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	5263000000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	21241000000	USD
CY2020	dfs	Sharebased Compensation Plans SharebasedCompensationPlans	2	plans
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	41000000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	69000000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	81000000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	9000000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	12000000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	15000000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Next Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	0	USD
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	99000000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	87000000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	69000000	USD
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CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	55000000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	172000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	227000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	55000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	172000000	USD
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CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-3000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-4000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	-12000000	USD
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CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-9000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax	5000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	5000000	USD
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CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	4000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	13000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	17000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	4000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	13000000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	135000000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	33000000	USD
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CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	135000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	33000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	102000000	USD
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CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-7000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-35000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	5000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	1000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	4000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax	-47000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-8000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-39000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	34000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	8000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	26000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	34000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	8000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	26000000	USD
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CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	7000000	USD
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CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	23000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	7000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	16000000	USD
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CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	4000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	13000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	6000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	2000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	4000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax	11000000	USD
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CY2019	dfs	Impairment Charge ImpairmentCharge	0	USD
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CY2019	dfs	Other Other Expense OtherOtherExpense	196000000	USD
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CY2019	us-gaap	Other Noninterest Expense OtherNoninterestExpense	503000000	USD
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CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	807000000	USD
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CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	50000000	USD
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CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	382000000	USD
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CY2020	us-gaap	Dividends Preferred Stock DividendsPreferredStock	31000000	USD
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CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.60
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	9.09
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.81
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.60
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	9.08
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.79
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2020Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	0	USD
CY2020Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	60000000	USD
CY2020Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	0	USD
CY2020Q4	dfs	Settlement Withholdings And Escrow Deposits SettlementWithholdingsAndEscrowDeposits	16000000	USD
CY2019Q4	dfs	Settlement Withholdings And Escrow Deposits SettlementWithholdingsAndEscrowDeposits	8000000	USD
CY2020	us-gaap	Litigation Settlement Expense LitigationSettlementExpense	31000000	USD
CY2020	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	59000000	USD
CY2019	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	1000000	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	0	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	0	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	7000000	USD
CY2020Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	0	USD
CY2020Q4	dfs	Derivative Collateral Rightto Reclaim Cashand Securities DerivativeCollateralRighttoReclaimCashandSecurities	0	USD
CY2019Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	0	USD
CY2019Q4	dfs	Derivative Collateral Rightto Reclaim Cashand Securities DerivativeCollateralRighttoReclaimCashandSecurities	7000000	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	1000000	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	0	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	0	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	0	USD
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2020	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	11095000000	USD
CY2020	us-gaap	Interest Expense InterestExpense	1865000000	USD
CY2020	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	9230000000	USD
CY2020	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	5134000000	USD
CY2020	us-gaap	Noninterest Income NoninterestIncome	1858000000	USD
CY2020	us-gaap	Noninterest Expense NoninterestExpense	4519000000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1435000000	USD
CY2019	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	11993000000	USD
CY2019	us-gaap	Interest Expense InterestExpense	2530000000	USD
CY2019	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	9463000000	USD
CY2019	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3231000000	USD
CY2019	us-gaap	Noninterest Income NoninterestIncome	1996000000	USD
CY2019	us-gaap	Noninterest Expense NoninterestExpense	4393000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	3835000000	USD
CY2018	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	10893000000	USD
CY2018	us-gaap	Interest Expense InterestExpense	2139000000	USD
CY2018	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	8754000000	USD
CY2018	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3035000000	USD
CY2018	us-gaap	Noninterest Income NoninterestIncome	1955000000	USD
CY2018	us-gaap	Noninterest Expense NoninterestExpense	4077000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	3597000000	USD
CY2020	dfs	Loanfeeincome Loanfeeincome	414000000	USD
CY2020	dfs	Other Noninterest Incomenot Subjectto Asc606 OtherNoninterestIncomenotSubjecttoASC606	80000000	USD
CY2020	dfs	Noninterest Incomenot Subjectto Asc606 NoninterestIncomenotSubjecttoASC606	494000000	USD
CY2020	us-gaap	Noninterest Income NoninterestIncome	1858000000	USD
CY2019	dfs	Loanfeeincome Loanfeeincome	449000000	USD
CY2019	dfs	Other Noninterest Incomenot Subjectto Asc606 OtherNoninterestIncomenotSubjecttoASC606	-3000000	USD
CY2019	dfs	Noninterest Incomenot Subjectto Asc606 NoninterestIncomenotSubjecttoASC606	446000000	USD
CY2019	us-gaap	Noninterest Income NoninterestIncome	1996000000	USD
CY2018	dfs	Loanfeeincome Loanfeeincome	402000000	USD
CY2018	dfs	Noninterest Incomenot Subjectto Asc606 NoninterestIncomenotSubjecttoASC606	402000000	USD
CY2018	us-gaap	Noninterest Income NoninterestIncome	1955000000	USD
CY2020	dfs	Customer Rewardsand Issuer Interchange CustomerRewardsandIssuerInterchange	1900000000	USD
CY2019	dfs	Customer Rewardsand Issuer Interchange CustomerRewardsandIssuerInterchange	1900000000	USD
CY2018	dfs	Customer Rewardsand Issuer Interchange CustomerRewardsandIssuerInterchange	1800000000	USD
CY2020	us-gaap	Interest Expense Domestic Deposit Liabilities Withdrawal Penalties InterestExpenseDomesticDepositLiabilitiesWithdrawalPenalties	2000000	USD
CY2019	us-gaap	Interest Expense Domestic Deposit Liabilities Withdrawal Penalties InterestExpenseDomesticDepositLiabilitiesWithdrawalPenalties	3000000	USD
CY2018	us-gaap	Interest Expense Domestic Deposit Liabilities Withdrawal Penalties InterestExpenseDomesticDepositLiabilitiesWithdrawalPenalties	3000000	USD
CY2020Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	2760000000	USD
CY2020Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	2681000000	USD
CY2020Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	2672000000	USD
CY2020Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	2982000000	USD
CY2019Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	3039000000	USD
CY2019Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	3040000000	USD
CY2019Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	2977000000	USD
CY2019Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	2937000000	USD
CY2020Q4	us-gaap	Interest Expense InterestExpense	383000000	USD
CY2020Q3	us-gaap	Interest Expense InterestExpense	416000000	USD
CY2020Q2	us-gaap	Interest Expense InterestExpense	482000000	USD
CY2020Q1	us-gaap	Interest Expense InterestExpense	584000000	USD
CY2019Q4	us-gaap	Interest Expense InterestExpense	615000000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	638000000	USD
CY2019Q2	us-gaap	Interest Expense InterestExpense	645000000	USD
CY2019Q1	us-gaap	Interest Expense InterestExpense	632000000	USD
CY2020Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	2377000000	USD
CY2020Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	2265000000	USD
CY2020Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	2190000000	USD
CY2020Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	2398000000	USD
CY2019Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	2424000000	USD
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	2402000000	USD
CY2019Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	2332000000	USD
CY2019Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	2305000000	USD
CY2020Q4	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	531000000	USD
CY2020Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	750000000	USD
CY2020Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	2046000000	USD
CY2020Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	1807000000	USD
CY2019Q4	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	836000000	USD
CY2019Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	799000000	USD
CY2019Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	787000000	USD
CY2019Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	809000000	USD
CY2020Q4	us-gaap	Noninterest Income NoninterestIncome	447000000	USD
CY2020Q3	us-gaap	Noninterest Income NoninterestIncome	449000000	USD
CY2020Q2	us-gaap	Noninterest Income NoninterestIncome	472000000	USD
CY2020Q1	us-gaap	Noninterest Income NoninterestIncome	490000000	USD
CY2019Q4	us-gaap	Noninterest Income NoninterestIncome	520000000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	498000000	USD
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	520000000	USD
CY2019Q1	us-gaap	Noninterest Income NoninterestIncome	458000000	USD
CY2020Q4	us-gaap	Noninterest Expense NoninterestExpense	1278000000	USD
CY2020Q3	us-gaap	Noninterest Expense NoninterestExpense	1005000000	USD
CY2020Q2	us-gaap	Noninterest Expense NoninterestExpense	1077000000	USD
CY2020Q1	us-gaap	Noninterest Expense NoninterestExpense	1159000000	USD
CY2019Q4	us-gaap	Noninterest Expense NoninterestExpense	1184000000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	1107000000	USD
CY2019Q2	us-gaap	Noninterest Expense NoninterestExpense	1078000000	USD
CY2019Q1	us-gaap	Noninterest Expense NoninterestExpense	1024000000	USD
CY2020Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1015000000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	959000000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-461000000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-78000000	USD
CY2019Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	924000000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	994000000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	987000000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	930000000	USD
CY2020Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	216000000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	188000000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-93000000	USD
CY2020Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-17000000	USD
CY2019Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	216000000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	224000000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	234000000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	204000000	USD
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	799000000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	771000000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	-368000000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-61000000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	708000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	770000000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	753000000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	726000000	USD
CY2020Q4	dfs	Net Income Loss Available To Common Stockholders Incl Participating Securities NetIncomeLossAvailableToCommonStockholdersInclParticipatingSecurities	794000000	USD
CY2020Q3	dfs	Net Income Loss Available To Common Stockholders Incl Participating Securities NetIncomeLossAvailableToCommonStockholdersInclParticipatingSecurities	751000000	USD
CY2020Q2	dfs	Net Income Loss Available To Common Stockholders Incl Participating Securities NetIncomeLossAvailableToCommonStockholdersInclParticipatingSecurities	-369000000	USD
CY2020Q1	dfs	Net Income Loss Available To Common Stockholders Incl Participating Securities NetIncomeLossAvailableToCommonStockholdersInclParticipatingSecurities	-78000000	USD
CY2019Q4	dfs	Net Income Loss Available To Common Stockholders Incl Participating Securities NetIncomeLossAvailableToCommonStockholdersInclParticipatingSecurities	704000000	USD
CY2019Q3	dfs	Net Income Loss Available To Common Stockholders Incl Participating Securities NetIncomeLossAvailableToCommonStockholdersInclParticipatingSecurities	749000000	USD
CY2019Q2	dfs	Net Income Loss Available To Common Stockholders Incl Participating Securities NetIncomeLossAvailableToCommonStockholdersInclParticipatingSecurities	747000000	USD
CY2019Q1	dfs	Net Income Loss Available To Common Stockholders Incl Participating Securities NetIncomeLossAvailableToCommonStockholdersInclParticipatingSecurities	705000000	USD
CY2020Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.59
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.45
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.20
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.25
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.25
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.36
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.32
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.15
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.59
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.45
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.20
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.25
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.25
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.36
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.32
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.15

Files In Submission

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2020 Q4 Form 10-K Financial Statement

#000139361221000014 Filed on February 17, 2021

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$DFS Discover Financial Services Stock $dfs

2020 Q4 Form 10-K Financial Statement

#000139361221000014 Filed on February 17, 2021

Income Statement

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$DFS
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