$DFS
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$dfs Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000139361222000007 Filed on February 24, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue		$10.65B	$2.760B
YoY Change		-4.0%	-9.18%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development		$500.0M
YoY Change		-7.41%
% of Gross Profit
Depreciation & Amortization	$144.0M	$531.0M	$123.0M
YoY Change	17.07%	9.48%	1.65%
% of Gross Profit
Operating Expenses		$500.0M
YoY Change		-7.41%
Operating Profit
YoY Change
Interest Expense		$1.134B	$383.0M
YoY Change		-39.2%	-37.72%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$1.361B	$7.064B	$1.015B
YoY Change	34.09%	392.26%	9.85%
Income Tax	$294.0M	$1.615B	$216.0M
% Of Pretax Income	21.6%	22.86%	21.28%
Net Earnings	$1.067B	$5.449B	$799.0M
YoY Change	33.54%	377.56%	12.85%
Net Earnings / Revenue		51.16%	28.95%
Basic Earnings Per Share		$17.85	$2.59
Diluted Earnings Per Share	$3.667M	$17.83	$2.59
COMMON SHARES
Basic Shares Outstanding	293.1M shares	300.0M shares	306.5M shares
Diluted Shares Outstanding		300.0M shares

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$15.65B		$23.48B
YoY Change	-33.32%		34.01%
Cash & Equivalents	$8.750B		$13.56B
Short-Term Investments	$6.904B		$9.914B
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$983.0M	$983.0M	$1.027B
YoY Change	-4.28%	-4.28%	-2.84%
Goodwill	$255.0M		$255.0M
YoY Change	0.0%		0.0%
Intangibles	$0.00		$95.00M
YoY Change	-100.0%		-38.71%
Long-Term Investments	$388.0M	$388.0M	$353.0M
YoY Change	9.92%	9.92%	5.06%
Other Assets		$1.494B
YoY Change		-15.83%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$110.2B	$110.2B	$112.9B
YoY Change	-2.34%	-2.34%	-0.97%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$4.214B	$4.214B	$3.860B
YoY Change	9.17%	9.17%	4.61%
Deferred Revenue
YoY Change
Short-Term Debt	$1.750B	$1.750B
YoY Change
Long-Term Debt Due	$5.185B	$5.185B	$4.217B
YoY Change	22.95%	22.95%	-19.63%
Total Short-Term Liabilities	$9.399B	$9.399B	$8.077B
YoY Change	16.37%	16.37%	-9.62%
LONG-TERM LIABILITIES
Long-Term Debt	$13.29B	$13.29B	$17.02B
YoY Change	-21.92%	-21.92%	-16.77%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$13.29B	$13.29B	$17.02B
YoY Change	-21.92%	-21.92%	-16.77%
TOTAL LIABILITIES
Total Short-Term Liabilities	$9.399B	$9.399B	$8.077B
Total Long-Term Liabilities	$13.29B	$13.29B	$17.02B
Total Liabilities	$96.83B	$96.83B	$102.0B
YoY Change	-5.07%	-5.07%	-0.13%
SHAREHOLDERS EQUITY
Retained Earnings	$24.77B		$19.96B
YoY Change	24.11%		-6.27%
Common Stock	$6.000M		$6.000M
YoY Change	0.0%		0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$16.70B		$14.44B
YoY Change	15.66%		2.47%
Treasury Stock Shares	280.5M shares		261.3M shares
Shareholders Equity	$13.41B	$13.41B	$10.88B
YoY Change
Total Liabilities & Shareholders Equity	$110.2B	$110.2B	$112.9B
YoY Change	-2.34%	-2.34%	-0.97%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	$1.067B	$5.449B	$799.0M
YoY Change	33.54%	377.56%	12.85%
Depreciation, Depletion And Amortization	$144.0M	$531.0M	$123.0M
YoY Change	17.07%	9.48%	1.65%
Cash From Operating Activities	$1.342B	$6.019B	$1.633B
YoY Change	-17.82%	-2.86%	11.54%
INVESTING ACTIVITIES
Capital Expenditures	-$48.00M	$194.0M	-$55.00M
YoY Change	-12.73%	-25.67%	-23.61%
Acquisitions
YoY Change
Other Investing Activities	-$3.343B	$234.0M	$3.751B
YoY Change	-189.12%	-86.82%	-225.75%
Cash From Investing Activities	-$3.391B	$40.00M	$3.696B
YoY Change	-191.75%	-97.36%	-220.98%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$2.251B
YoY Change		565.98%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	633.0M	-$8.316B	-1.829B
YoY Change	-134.61%	666.45%	-174.87%
NET CHANGE
Cash From Operating Activities	1.342B	$6.019B	1.633B
Cash From Investing Activities	-3.391B	$40.00M	3.696B
Cash From Financing Activities	633.0M	-$8.316B	-1.829B
Net Change In Cash	-1.416B	-$2.257B	3.500B
YoY Change	-140.46%	-134.07%	310.8%
FREE CASH FLOW
Cash From Operating Activities	$1.342B	$6.019B	$1.633B
Capital Expenditures	-$48.00M	$194.0M	-$55.00M
Free Cash Flow	$1.390B	$5.825B	$1.688B
YoY Change	-17.65%	-1.85%	9.9%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0001393612
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Entity File Number EntityFileNumber	001-33378
CY2021	dei	Entity Registrant Name EntityRegistrantName	DISCOVER FINANCIAL SERVICES
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	36-2517428
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	2500 Lake Cook Road
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Riverwoods
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	IL
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	60015
CY2021	dei	City Area Code CityAreaCode	224
CY2021	dei	Local Phone Number LocalPhoneNumber	405-0900
CY2021	dei	Security12b Title Security12bTitle	Common Stock, par value $0.01 per share
CY2021	dei	Trading Symbol TradingSymbol	DFS
CY2021	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	false
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021	dei	Entity Shell Company EntityShellCompany	false
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CY2021	dei	Auditor Location AuditorLocation	Chicago, Illinois
CY2021	dei	Auditor Name AuditorName	Deloitte & Touche LLP
CY2021	dei	Auditor Location AuditorLocation	Chicago, Illinois
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CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	294000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	878000000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	5449000000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1141000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	2957000000	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	5351000000	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	5351000000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	1104000000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1104000000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	2908000000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	2908000000	USD
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	17.85
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.60
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	9.09
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	17.83
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.60
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	9.08
CY2021	us-gaap	Net Income Loss NetIncomeLoss	5449000000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1141000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	2957000000	USD
CY2021	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-170000000	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
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	3000000	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
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-28000000	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
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-139000000	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
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	5310000000	USD
CY2021	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	218000000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1305000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2994000000	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
CY2021	us-gaap	Net Income Loss NetIncomeLoss	5449000000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-139000000	USD
CY2021	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	2260000000	USD
CY2021	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	9000000	USD
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	103000000	USD
CY2021	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	0	USD
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.88
CY2021	us-gaap	Dividends Common Stock DividendsCommonStock	569000000	USD
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	13408000000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	5449000000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	1141000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	2957000000	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
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	327000000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-672000000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-133000000	USD
CY2021	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	531000000	USD
CY2020	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	485000000	USD
CY2019	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	436000000	USD
CY2021	dfs	Amortizationofdeferredrevenuesandaccretionofaccretableyieldonacquiredloans Amortizationofdeferredrevenuesandaccretionofaccretableyieldonacquiredloans	295000000	USD
CY2020	dfs	Amortizationofdeferredrevenuesandaccretionofaccretableyieldonacquiredloans Amortizationofdeferredrevenuesandaccretionofaccretableyieldonacquiredloans	320000000	USD
CY2019	dfs	Amortizationofdeferredrevenuesandaccretionofaccretableyieldonacquiredloans Amortizationofdeferredrevenuesandaccretionofaccretableyieldonacquiredloans	421000000	USD
CY2021	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	382000000	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
CY2021	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	257000000	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
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	496000000	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
CY2021	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	410000000	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
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	6019000000	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
CY2021	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	2200000000	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
CY2021	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	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
CY2021	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	2727000000	USD
CY2020	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1007000000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	140000000	USD
CY2021	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	9000000	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
CY2021	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	82000000	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
CY2021	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	28000000	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
CY2021	us-gaap	Payments For Proceeds From Loans Receivable PaymentsForProceedsFromLoansReceivable	4574000000	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
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	5000000	USD
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	USD
CY2021	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	1000000	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
CY2021	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	170000000	USD
CY2020	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	72000000	USD
CY2019	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	68000000	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	194000000	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
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	40000000	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
CY2021	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	1750000000	USD
CY2020	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	0	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	0	USD
CY2021	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	1727000000	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
CY2021	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	3451000000	USD
CY2020	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	3531000000	USD
CY2019	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	6287000000	USD
CY2021	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	0	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
CY2021	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	922000000	USD
CY2020	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	1755000000	USD
CY2019	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	286000000	USD
CY2021	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-4533000000	USD
CY2020	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	4128000000	USD
CY2019	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	4945000000	USD
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	9000000	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
CY2021	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	0	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
CY2021	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	636000000	USD
CY2020	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	576000000	USD
CY2019	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	573000000	USD
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2260000000	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
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-8316000000	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
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-2257000000	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
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
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	11332000000	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
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	8750000000	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
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	2582000000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	25000000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	40000000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	11332000000	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
CY2021	us-gaap	Interest Paid Net InterestPaidNet	1077000000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	1799000000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	2407000000	USD
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1305000000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	901000000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1088000000	USD
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2021	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.
CY2021	dfs	Consolidation Percentage ConsolidationPercentage	0.50
CY2021	dfs	Consolidation Percentage ConsolidationPercentage	0.50
CY2021	dfs	Cost Method Ownership Percentage CostMethodOwnershipPercentage	0.20
CY2021Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	1200000000	USD
CY2020Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	1100000000	USD
CY2021Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	7600000000	USD
CY2020Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	12500000000	USD
CY2021	dfs	Bankruptcy And Probate Charge Off Period BankruptcyAndProbateChargeOffPeriod	P60D
CY2021	dfs	Fraudulent Transaction Charge Off Period FraudulentTransactionChargeOffPeriod	P90D
CY2021Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	0	USD
CY2021Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	0	USD
CY2021	us-gaap	Advertising Expense AdvertisingExpense	262000000	USD
CY2020	us-gaap	Advertising Expense AdvertisingExpense	212000000	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	264000000	USD
CY2021	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 composed 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 other assets 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 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, 2021 and 2020, deferred revenues related to balance transfer fees, recorded as a reduction of loan receivables, were $62 million. 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, 2021 and 2020, the remaining unamortized deferred costs related to loan origination were $222 million and $157 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 credit card and closed-end loan receivables until the loans are paid or charged off, except in instances of customer bankruptcy, death or suspected fraud, where no further interest and fee accruals occur following notification. 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 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 applied to loans that are not in such programs.</span></div>
CY2021Q4	us-gaap	Deferred Costs Credit Card Origination Costs Amount DeferredCostsCreditCardOriginationCostsAmount	222000000	USD
CY2020Q4	us-gaap	Deferred Costs Credit Card Origination Costs Amount DeferredCostsCreditCardOriginationCostsAmount	157000000	USD
CY2020Q4	us-gaap	Deferred Discounts Finance Charges And Interest Included In Receivables DeferredDiscountsFinanceChargesAndInterestIncludedInReceivables	62000000	USD
CY2021	dfs	Credit Card Rewards Cost Adjusted For Estimated Forfeitures CreditCardRewardsCostAdjustedForEstimatedForfeitures	2500000000	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
CY2021Q4	dfs	Credit Card Rewards Liability Net CreditCardRewardsLiabilityNet	2000000000	USD
CY2020Q4	dfs	Credit Card Rewards Liability Net CreditCardRewardsLiabilityNet	1700000000	USD
CY2021Q4	dfs	Unamortrized Deferred Incentive Payments UnamortrizedDeferredIncentivePayments	33000000	USD
CY2021Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	0	USD
CY2020Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	2200000000	USD
CY2021Q4	us-gaap	Marketable Securities MarketableSecurities	6904000000	USD
CY2020Q4	us-gaap	Marketable Securities MarketableSecurities	9914000000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	6549000000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	151000000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	0	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	6700000000	USD
CY2021Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	204000000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	3000000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	1000000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	206000000	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
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	0	securities
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	5000000	USD
CY2020	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
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	1997000000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	4380000000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	165000000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	7000000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	6549000000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	0	USD
CY2021Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	0	USD
CY2021Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	0	USD
CY2021Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	204000000	USD
CY2021Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	204000000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	2016000000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	4507000000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	170000000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	7000000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	6700000000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	0	USD
CY2021Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	0	USD
CY2021Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	0	USD
CY2021Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	206000000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	206000000	USD
CY2021Q4	dfs	Available For Sale Securities Debt Maturities Within One Year Percentage AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearPercentage	0.0231
CY2021Q4	dfs	Available For Sale Securities Debt Maturities After One Year Through Five Years Percentage AvailableForSaleSecuritiesDebtMaturitiesAfterOneYearThroughFiveYearsPercentage	0.0222
CY2021Q4	dfs	Available For Sale Securities Debt Maturities After Five Years Through Ten Years Percentage AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsThroughTenYearsPercentage	0.0203
CY2021Q4	dfs	Available For Sale Securities Debt Maturities After Ten Years Percentage AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsPercentage	0.0090
CY2021Q4	dfs	Available For Sale Securities Debt Maturities Percentage AvailableForSaleSecuritiesDebtMaturitiesPercentage	0.0224
CY2021Q4	dfs	Held To Maturity Securities Debt Maturities Within One Year Percentage HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearPercentage	0
CY2021Q4	dfs	Held To Maturity Securities Debt Maturities After One Year Through Five Years Percentage HeldToMaturitySecuritiesDebtMaturitiesAfterOneYearThroughFiveYearsPercentage	0
CY2021Q4	dfs	Held To Maturity Securities Debt Maturities After Five Years Though Ten Years Percentage HeldToMaturitySecuritiesDebtMaturitiesAfterFiveYearsThoughTenYearsPercentage	0
CY2021Q4	dfs	Held To Maturity Securities Debt Maturities After Ten Years Percentage HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsPercentage	0.0279
CY2021Q4	dfs	Held To Maturity Securities Debt Maturities Percentage HeldToMaturitySecuritiesDebtMaturitiesPercentage	0.0279
CY2021	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	182000000	USD
CY2020	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	252000000	USD
CY2019	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	179000000	USD
CY2021	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	0	USD
CY2020	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	0	USD
CY2019	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	0	USD
CY2021	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	423000000	USD
CY2020	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	0	USD
CY2021	dfs	Loan Portfolio Segments LoanPortfolioSegments	2	segment
CY2021	dfs	Loan Portfolio Segments LoanPortfolioSegments	2	segment
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	93684000000	USD
CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	90449000000	USD
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	6822000000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	8226000000	USD
CY2021Q4	us-gaap	Notes Receivable Net NotesReceivableNet	86862000000	USD
CY2020Q4	us-gaap	Notes Receivable Net NotesReceivableNet	82223000000	USD
CY2021Q4	dfs	Revolving Lineof Credit Arrangement Convertedto Term Loanthrough Loan Modification Program Ending Balance RevolvingLineofCreditArrangementConvertedtoTermLoanthroughLoanModificationProgramEndingBalance	813000000	USD
CY2020Q4	dfs	Revolving Lineof Credit Arrangement Convertedto Term Loanthrough Loan Modification Program Ending Balance RevolvingLineofCreditArrangementConvertedtoTermLoanthroughLoanModificationProgramEndingBalance	1000000000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	8226000000	USD
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	227000000	USD
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	2534000000	USD
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	903000000	USD
CY2021	us-gaap	Financing Receivable Allowance For Credit Loss Writeoff After Recovery FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery	1631000000	USD
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	6822000000	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	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
CY2021	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-9000000	USD
CY2020	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	17000000	USD
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	6800000000	USD
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	-1400000000	USD
CY2020Q3	dfs	Financing Receivable Allowancefor Credit Loss Reasonableand Supportable Forecast Period FinancingReceivableAllowanceforCreditLossReasonableandSupportableForecastPeriod	P18M
CY2021Q4	dfs	Expected Future Peak Unemployment Rate ExpectedFuturePeakUnemploymentRate	0.057
CY2021Q4	dfs	Expected Future Unemployment Rate ExpectedFutureUnemploymentRate	0.040
CY2021Q4	dfs	Expected Future Increasein Gdp ExpectedFutureIncreaseinGDP	0.033
CY2020Q4	dfs	Financing Receivable Allowancefor Credit Loss Reasonableand Supportable Forecast Period FinancingReceivableAllowanceforCreditLossReasonableandSupportableForecastPeriod	P18M
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
CY2021	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
CY2020Q4	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
CY2021	dfs	Financing Receivable Allowancefor Credit Loss Reasonableand Supportable Forecast Period FinancingReceivableAllowanceforCreditLossReasonableandSupportableForecastPeriod	P18M
CY2020	dfs	Financing Receivable Allowancefor Credit Loss Reversion Period FinancingReceivableAllowanceforCreditLossReversionPeriod	P12M
CY2021	dfs	Financing Receivable Allowancefor Credit Loss Reversion Period FinancingReceivableAllowanceforCreditLossReversionPeriod	P12M
CY2021	dfs	Interest And Fees Accrued Subsequently Charged Off Net Of Recoveries InterestAndFeesAccruedSubsequentlyChargedOffNetOfRecoveries	286000000	USD
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
CY2021	dfs	Fees Accrued Subsequently Charged Off Net Of Recoveries FeesAccruedSubsequentlyChargedOffNetOfRecoveries	75000000	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
CY2021Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	575000000	USD
CY2021Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	225000000	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
CY2021	dfs	Percentage Of Defaulted Loans That Charged Off PercentageOfDefaultedLoansThatChargedOff	0.66
CY2020	dfs	Percentage Of Defaulted Loans That Charged Off PercentageOfDefaultedLoansThatChargedOff	0.53
CY2019	dfs	Percentage Of Defaulted Loans That Charged Off PercentageOfDefaultedLoansThatChargedOff	0.38
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2832000000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2737000000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	84000000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	983000000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1027000000	USD
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	86000000	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	98000000	USD
CY2021	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	103000000	USD
CY2020	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	100000000	USD
CY2019	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	80000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	0	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
CY2021Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	0	USD
CY2020Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	92000000	USD
CY2021	dfs	Deposits Source Channels DepositsSourceChannels	2	channels
CY2021Q4	us-gaap	Deposit Liability Uninsured DepositLiabilityUninsured	8200000000	USD
CY2020Q4	us-gaap	Deposit Liability Uninsured DepositLiabilityUninsured	7300000000	USD
CY2021Q4	us-gaap	Time Deposit Liability Above Us Insurance Limit Maturity Three Months Or Less TimeDepositLiabilityAboveUsInsuranceLimitMaturityThreeMonthsOrLess	157000000	USD
CY2021Q4	us-gaap	Time Deposit Liability Above Us Insurance Limit Maturity Over Three Months Through Six Months TimeDepositLiabilityAboveUsInsuranceLimitMaturityOverThreeMonthsThroughSixMonths	104000000	USD
CY2021Q4	us-gaap	Time Deposit Liability Above Us Insurance Limit Maturity Over Six Months Through Twelve Months TimeDepositLiabilityAboveUsInsuranceLimitMaturityOverSixMonthsThroughTwelveMonths	187000000	USD
CY2021Q4	us-gaap	Time Deposit Liability Above Us Insurance Limit Maturity Over12 Months TimeDepositLiabilityAboveUsInsuranceLimitMaturityOver12Months	86000000	USD
CY2021Q4	us-gaap	Time Deposit Liability Above Us Insurance Limit TimeDepositLiabilityAboveUsInsuranceLimit	534000000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	14214000000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	2944000000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	1499000000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	872000000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	860000000	USD
CY2021Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	736000000	USD
CY2021Q4	us-gaap	Time Deposits TimeDeposits	21125000000	USD
CY2021Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	18477000000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	21241000000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	5185000000	USD
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CY2021Q4	us-gaap	Federal Home Loan Bank Advances FederalHomeLoanBankAdvances	1300000000	USD
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CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-56000000	USD
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CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	0	USD
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CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-9000000	USD
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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 Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	4000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	13000000	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
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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
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CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	8000000	USD
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CY2019	us-gaap	Net Income Loss NetIncomeLoss	2957000000	USD
CY2021	us-gaap	Dividends Preferred Stock DividendsPreferredStock	69000000	USD
CY2020	us-gaap	Dividends Preferred Stock DividendsPreferredStock	31000000	USD
CY2019	us-gaap	Dividends Preferred Stock DividendsPreferredStock	31000000	USD
CY2021	dfs	Net Income Loss Available To Common Stockholders Incl Participating Securities NetIncomeLossAvailableToCommonStockholdersInclParticipatingSecurities	5380000000	USD
CY2020	dfs	Net Income Loss Available To Common Stockholders Incl Participating Securities NetIncomeLossAvailableToCommonStockholdersInclParticipatingSecurities	1110000000	USD
CY2019	dfs	Net Income Loss Available To Common Stockholders Incl Participating Securities NetIncomeLossAvailableToCommonStockholdersInclParticipatingSecurities	2926000000	USD
CY2021	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	29000000	USD
CY2020	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	6000000	USD
CY2019	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	18000000	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	5351000000	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	5351000000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	1104000000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1104000000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	2908000000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	2908000000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	300000000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	307000000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	320000000	shares
CY2021	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2020	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	300000000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	307000000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	320000000	shares
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	17.85
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.60
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	9.09
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	17.83
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.60
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	9.08
CY2021Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	0	USD
CY2021Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	70000000	USD
CY2021Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	0	USD
CY2021Q4	dfs	Settlement Withholdings And Escrow Deposits SettlementWithholdingsAndEscrowDeposits	15000000	USD
CY2020Q4	dfs	Settlement Withholdings And Escrow Deposits SettlementWithholdingsAndEscrowDeposits	16000000	USD
CY2021	us-gaap	Litigation Settlement Expense LitigationSettlementExpense	59000000	USD
CY2020	us-gaap	Litigation Settlement Expense LitigationSettlementExpense	31000000	USD
CY2021	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	95000000	USD
CY2020	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	59000000	USD
CY2021Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	0	USD
CY2021Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	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
CY2021Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	0	USD
CY2021Q4	dfs	Derivative Collateral Rightto Reclaim Cashand Securities DerivativeCollateralRighttoReclaimCashandSecurities	0	USD
CY2020Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	0	USD
CY2020Q4	dfs	Derivative Collateral Rightto Reclaim Cashand Securities DerivativeCollateralRighttoReclaimCashandSecurities	0	USD
CY2021Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	0	USD
CY2021Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	0	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
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2021	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	10651000000	USD
CY2021	us-gaap	Interest Expense InterestExpense	1134000000	USD
CY2021	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	9517000000	USD
CY2021	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	218000000	USD
CY2021	us-gaap	Noninterest Income NoninterestIncome	2570000000	USD
CY2021	us-gaap	Noninterest Expense NoninterestExpense	4805000000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	7064000000	USD
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 Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	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 Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	3835000000	USD
CY2021	dfs	Loanfeeincome Loanfeeincome	464000000	USD
CY2021	dfs	Other Noninterest Incomenot Subjectto Asc606 OtherNoninterestIncomenotSubjecttoASC606	424000000	USD
CY2021	dfs	Noninterest Incomenot Subjectto Asc606 NoninterestIncomenotSubjecttoASC606	888000000	USD
CY2021	us-gaap	Noninterest Income NoninterestIncome	2570000000	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
CY2021	dfs	Customer Rewardsand Issuer Interchange CustomerRewardsandIssuerInterchange	2500000000	USD
CY2020	dfs	Customer Rewardsand Issuer Interchange CustomerRewardsandIssuerInterchange	1900000000	USD
CY2019	dfs	Customer Rewardsand Issuer Interchange CustomerRewardsandIssuerInterchange	1900000000	USD
CY2021	us-gaap	Interest Expense Domestic Deposit Liabilities Withdrawal Penalties InterestExpenseDomesticDepositLiabilitiesWithdrawalPenalties	2000000	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
CY2021	dei	Auditor Firm AuditorFirmId	34

Files In Submission

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$DFS
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2021 Q4 Form 10-K Financial Statement

#000139361222000007 Filed on February 24, 2022

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$DFS Discover Financial Services Stock $dfs

2021 Q4 Form 10-K Financial Statement

#000139361222000007 Filed on February 24, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

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$DFS
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