Summary of Significant Accounting Policies (Policies)	12 Months Ended
Dec. 31, 2023
Accounting Policies [Abstract]
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents is defined by the Company as cash on deposit with banks, including time deposits and other highly liquid investments with maturities of 90 days or less when purchased, excluding amounts restricted by certain contractual or other obligations. Cash and cash equivalents included $2.0 billion and $1.5 billion of cash and due from banks and $9.7 billion and $7.4 billion of interest-earning deposits at other banks at December 31, 2023 and 2022, respectively.
Restricted Cash	Restricted Cash Restricted cash includes cash in accounts from which the Company’s ability to withdraw funds at any time is contractually limited. Restricted cash is generally designated for specific purposes arising out of certain contractual or other obligations.
Investment Securities	Investment Securities At December 31, 2023, investment securities consisted of debt obligations of the U.S. Treasury and government-sponsored enterprises of the U.S. (“U.S. GSEs”) and mortgage-backed securities issued by government agencies or U.S. GSEs. Investment securities that the Company has the positive intent and ability to hold to maturity are classified as held-to-maturity and are reported at amortized cost. All other investment securities are classified as available-for-sale, as the Company does not hold investment securities for trading purposes. Available-for-sale investment securities are reported at fair value with unrealized gains and losses, net of tax, reported as a component of accumulated other comprehensive income (“AOCI”) included in stockholders’ equity. The Company estimates the fair value of available-for-sale investment securities as more fully discussed in Note 20: Fair Value Measurements. The amortized cost for each held-to-maturity and available-for-sale investment security is adjusted for amortization of premiums or accretion of discounts, as appropriate. Such amortization or accretion is included in interest income. Interest on investment securities is accrued each month in accordance with their contractual terms and recorded in other assets in the consolidated statements of financial condition. The U.S. Treasury and U.S. GSE obligations and mortgage-backed securities issued by government agencies or U.S. GSEs in which the Company invests have long histories with no credit losses and are explicitly or implicitly guaranteed by the U.S. government. Therefore, management has concluded that there is no expectation of non-payment on its investment securities and does not record an allowance for credit losses on these investments.
Loan Receivables	Loan Receivables Loan receivables consist of credit card receivables and other loan receivables. The carrying values of all classes of loan receivables include unamortized net deferred loan origination fees and costs (also see “— Significant Revenue Recognition Accounting Policies — Loan Interest and Fee Income”). The credit card loan receivables carrying amount includes the principal amounts outstanding and uncollected billed interest and fees and is reduced for unearned revenue related to balance transfer fees (also see “— Significant Revenue Recognition Accounting Policies — Loan Interest and Fee Income”). Other loans consist of private student loans, personal loans and other loans and the carrying amount of those loans includes principal amounts outstanding. For private student loans, principal amounts outstanding also include accrued interest that has been capitalized. The Company’s loan receivables are deemed to be held-for-investment at origination or acquisition because management has the intent and ability to hold them for the foreseeable future. Cash flows associated with loans originated or acquired for investment are classified as cash flows from investing activities, regardless of a subsequent change in intent.
Delinquent Loans and Charge-Offs	Delinquent Loans and Net Charge-Offs The entire balance of an account is contractually past due if the minimum payment is not received by the specified date on the customer’s billing statement. Delinquency is reported on loans that are 30 days or more past due. Credit card loans are charged off at the end of the month during which an account becomes 180 days past due. Closed-end unsecured consumer loan receivables are charged off at the end of the month during which an account becomes 120 days contractually past due. Customer bankruptcies and probate accounts are charged off by the end of the month 60 days following the receipt of notification of the bankruptcy or death, but not later than the 180-day or 120-day time frame described above. Receivables associated with alleged or potential fraudulent transactions are reserved for at their net realizable value upon receipt of notification of such fraud through a charge to other expense and are subsequently written off at the end of the month 90 days following notification, but not later than the contractual 180-day or 120-day time frame described above. The Company’s charge-off policies are designed to comply with guidelines established by the Federal Financial Institutions Examination Council (“FFIEC”). The Company’s net charge-offs include the principal amount of loans charged off less principal recoveries and exclude charged-off interest and fees, recoveries of interest and fees and fraud losses. The practice of re-aging an account also may affect loan delinquencies and charge-offs. A re-age is intended to assist delinquent customers who have experienced financial difficulties but who demonstrate both an ability and willingness to repay. Accounts meeting specific criteria are re-aged when the Company and the customer agree on a temporary repayment schedule that may include concessionary terms. With re-aging, the outstanding balance of a delinquent account is returned to a current status. Customers may also qualify for a workout re-age when either a longer term or permanent hardship exists. The Company’s re-age practices are designed to comply with FFIEC guidelines.
Allowance for Credit Losses	Allowance for Credit Losses The Company maintains an allowance for credit losses at a level that is appropriate to absorb net credit losses anticipated over the remaining expected life of loan receivables as of the balance sheet date. The estimate of expected credit losses considers uncollectible principal, interest and fees associated with the Company's loan receivables existing as of the balance sheet date. Additionally, the estimate includes expected recoveries of amounts that were either previously charged off or are expected to be charged off. The allowance is evaluated quarterly for appropriateness and is maintained through an adjustment to the provision for credit losses. Charge-offs of principal amounts of loans outstanding are deducted from the allowance and subsequent recoveries of such amounts increase the allowance. Charge-offs of loan balances representing unpaid interest and fees result in a reversal of interest and fee income, respectively, which is effectively a reclassification of the provision for credit losses. The Company calculates its allowance for credit losses by estimating expected credit losses separately for classes of receivables with similar risk characteristics. This results in segmenting the portfolio by loan product type, which is the level that the Company develops and documents its methodology for determining the allowance for credit losses. The estimate of expected credit losses for each loan product type is based on: (i) a reasonable and supportable forecast period; (ii) a reversion period; and (iii) a post-reversion period based on historical information covering the remaining life of the loan, all of which is netted with expected recoveries. The lengths of the reasonable and supportable forecast and reversion periods can vary and are subject to a quarterly assessment that considers the economic outlook and level of variability among macroeconomic forecasts. The Company applies a weighted approach in reverting from the reasonable and supportable forecast period to the post-reversion period. Several analyses are used to help estimate credit losses anticipated over the remaining expected life of loan receivables as of the balance sheet date. The Company's estimation process includes models that predict customer losses based on risk characteristics and portfolio attributes, macroeconomic variables and historical data and analysis. There is a significant amount of judgment applied in selecting inputs and analyzing the results produced by the models to determine the allowance. For credit card loans, the Company uses a modeling framework that includes the following components for estimating expected credit losses: •Probability of default: this component estimates the probability of charge-off at different points in time over the life of each loan. •Exposure at default: this component estimates the balance on the loan at the time of default. Given that there is no stated life of a receivable balance on a revolving credit card account, the Company applies a percentage of expected payments to estimate the balance that would remain at the time of charge-off. •Recoveries from charged-off accounts are estimated separately and are netted as part of the aggregation of all of the components of the card loss modeling framework. •The output of the above three components is adjusted to remove post measurement date activity. For private student loans and personal loans, the Company uses vintage-based models that estimate expected credit losses over the life of the loan, net of recovery estimates, impacted mainly by time elapsed since origination, credit quality of origination vintages and macroeconomic forecasts. The components described above for credit card, private student and personal loans are developed utilizing historical data and applicable macroeconomic variable inputs based on statistical analysis and customer behavioral relationships with credit performance. Expected recoveries from loans charged off as of the balance sheet date are modeled separately and included in the allowance estimate. The Company leverages these models and recent macroeconomic forecasts for the portion of the estimate associated with the reasonable and supportable forecast period. To estimate expected credit losses for the remainder of the life of the credit card loans, the Company reverts to historical experience of credit card loans with characteristics similar to those as of the balance sheet date and observed over various phases of a credit cycle. To estimate expected credit losses for the remainder of the life of private student and personal loans, the Company generally reverts to use of average macroeconomic variables over an appropriate historical period. The considerations in these models include past and current loan performance, loan growth and seasoning, risk management practices, account collection strategies, economic conditions, bankruptcy filings, policy changes and forecasting uncertainties. Consideration of past and current loan performance includes the post-modification performance of loans to borrowers experiencing financial difficulty. For the credit card loan portfolio, the Company estimates its credit losses on a loan-level basis, which includes loans that are delinquent and/or no longer accruing interest and/or loans that have been restructured. For the remainder of its portfolio, including private student, personal and other loans, the Company estimates its credit losses on a pooled basis. For all loan types, recoveries are estimated at a pooled level based on estimates of future cash flows derived using historical experience. Accrued interest receivable on credit card loans is included in the estimate of expected credit losses once billed to the customer (i.e., once the interest becomes part of the loan balance). Except as noted in the following sentence, an allowance for credit losses is not recorded for unbilled credit card interest or accrued interest receivable on other loan classes as the impact to the allowance for credit losses is not material. Accrued interest receivable on student loans that have not yet entered repayment is included in the estimate of expected credit losses. No liability for expected credit losses is required for unused lines of credit on the Company’s credit card loans because they are unconditionally cancellable. The Company records a liability for expected credit losses for unfunded commitments on all other loans, which is presented as part of accrued expenses and other liabilities in the consolidated statements of financial condition. This liability is evaluated quarterly for appropriateness and is maintained through an adjustment to the provision for credit losses. As part of certain collection strategies, the Company may modify the terms of loans to customers experiencing financial hardship. Temporary and permanent modifications on credit card and personal loans, as well as temporary modifications on private student loans and certain grants of private student loan forbearance are generally subject to disclosure as loan modifications to borrowers experiencing financial difficulty. Loan receivables that have been modified are subject to the same requirements for the accrual of expected credit loss over their expected remaining lives as described above for unmodified loans. The effects of all loan modifications, whether or not they are subject to disclosure as loan modifications to borrowers experiencing financial difficulty, are reflected in the allowance for credit losses.
Premises and Equipment, net	Premises and Equipment, net Premises and equipment, net, are stated at cost less provisions for impairment and accumulated depreciation and amortization. Accumulated depreciation and amortization is computed using the straight-line method over the estimated useful lives of the assets. The Company periodically reviews the estimated useful lives and may adjust them as necessary. Buildings are depreciated over a period of thirty-nine years. The costs of improvements are capitalized and depreciated either over the asset’s estimated useful life, typically ten years to fifteen years, or over the remaining term of the lease, when applicable. Furniture and fixtures are depreciated over a period of five years to ten years. Equipment is depreciated over three years to ten years. Maintenance and repairs are immediately expensed when incurred, while the costs of significant improvements are capitalized. Purchased software and capitalized costs related to internally developed software are amortized over their useful lives of three years to ten years. Costs incurred during the application development stage related to internally developed software are capitalized. Costs are expensed as incurred during the preliminary project stage and post implementation stage. Once the capitalization criteria as defined in GAAP have been met, external direct costs incurred for materials and services used in developing or obtaining internal-use computer software and payroll and payroll-related costs for employees who are directly associated with the internal-use computer software project (to the extent those employees devoted time directly to the project) are capitalized. Amortization of capitalized costs begins when the software is ready for its intended use. Capitalized software is included in premises and equipment, net in the Company’s consolidated statements of financial condition. See Note 6: Premises and Equipment for further information about the Company’s premises and equipment. Cloud computing arrangements involving the licensing of software that meet certain criteria are recognized as the acquisition of software. Such assets are measured at the present value of the license obligation, if the license is to be paid over time, in addition to any capitalized upfront costs and amortized over the life of the arrangement. Cloud computing arrangements that do not meet the criteria to be recognized as acquired software are accounted for as service contracts. To date, none of the Company’s cloud computing arrangements have met the criteria to be recognized as acquired software. Premises and equipment are subject to impairment testing when events or conditions indicate that the carrying value of the asset may not be fully recoverable from future cash flows. A test for recoverability is done by comparing the asset’s carrying value to the sum of the undiscounted future net cash inflows expected to be generated from the use of the asset over its remaining useful life. Impairment exists if the sum of the undiscounted expected future net cash inflows is less than the carrying amount of the asset. Impairment would result in a write-down of the asset to its estimated fair value. The estimated fair values of these assets are based on the discounted present value of the stream of future net cash inflows expected to be derived over the remaining useful lives of the assets. If an impairment write-down is recorded, the remaining useful life of the asset will be evaluated to determine whether revision of the remaining amortization or depreciation period is appropriate.
Goodwill	Goodwill Goodwill is recorded as part of the Company’s acquisitions of businesses when the purchase price exceeds the fair value of the net tangible and separately identifiable intangible assets acquired. The Company’s goodwill is not amortized, but rather is subject to an impairment test at the reporting unit level annually as of October 1, or between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The Company’s reported goodwill relates to PULSE, which it acquired in 2005. The Company’s goodwill is tested for impairment by comparing the fair value of the reporting unit to its carrying value. If the fair value of the reporting unit exceeds its carrying value, goodwill is not impaired. If the carrying value exceeds its fair value, an impairment loss must be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. No impairment was identified during the impairment test conducted as of October 1, 2023.
Stock-based Compensation	Stock-based Compensation The Company measures the cost of services received from employees and non-employee directors in exchange for an award of stock-based compensation based on the grant-date fair value of the award. The cost, net of estimated forfeitures, is recognized over the requisite service period. Awards to employees who are retirement-eligible at any point during the year are amortized over 12 months in accordance with the vesting terms that apply under those circumstances. No compensation cost is recognized for awards that are subsequently forfeited.
Advertising Costs	Advertising Costs The Company expenses television and radio advertising costs in the period in which the advertising is first aired and all other advertising costs as incurred. Advertising costs are recorded in marketing and business development and were $359 million, $307 million and $262 million for the years ended December 31, 2023, 2022 and 2021, respectively.
Income Taxes	Income Taxes Income tax expense is provided for using the asset and liability method, under which deferred tax assets and liabilities are determined based on the temporary differences between the financial reporting and income tax bases of assets and liabilities using currently enacted tax rates. Deferred tax assets are recognized when their realization is determined to be more likely than not. A valuation allowance is provided if the Company believes it is more likely than not that all or some portion of the deferred tax asset will not be realized. An increase or decrease in the valuation allowance that results from a change in circumstances and which causes a change in management’s judgment about the realizability of the related deferred tax asset is included in the current tax provision. Uncertain tax positions are measured at the highest amount of tax benefit for which realization is judged to be more likely than not. Tax benefits that do not meet these criteria are unrecognized tax benefits. The Company recognizes and reports interest and penalties, if necessary, related to uncertain tax positions within its provision for income tax expense. See Note 15: Income Taxes for more information about the Company’s income taxes.
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The Company records unrealized gains and losses on available-for-sale securities, changes in the fair value of cash flow hedges and certain pension and foreign currency translation adjustments in other comprehensive income (“OCI”) on an after-tax basis where applicable. The Company’s policy is to adjust the tax effects of a component of AOCI in the same period in which the item is sold or otherwise derecognized, or when the carrying value of the item is remeasured. Details of OCI, net of tax, are presented in the statement of comprehensive income and a roll forward of AOCI is presented in the consolidated statements of changes in stockholders’ equity and Note 13: Accumulated Other Comprehensive Income.
Significant Revenue Recognition Accounting Policies, Loan Interest and Fee Income	Significant Revenue Recognition Accounting Policies Loan Interest and Fee Income 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. 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, 2023 and 2022, deferred revenues related to balance transfer fees, recorded as a reduction of loan receivables, were $107 million and $85 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. 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, 2023 and 2022, the remaining unamortized deferred costs related to loan origination were $306 million and $298 million, respectively, and were recorded in loan receivables. 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. Interest income from loans disclosed as modifications to borrowers experiencing financial difficulty 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 have not been modified.
Significant Revenue Recognition Accounting Policies, Other	Discount and Interchange Revenue The Company earns discount revenue from fees charged to merchants with whom it has entered into card acceptance agreements for processing credit card purchase transactions. The Company earns acquirer interchange revenue primarily from merchant acquirers on Discover Network, Diners Club and PULSE transactions made by credit and debit card customers at merchants with whom merchant acquirers have entered into card acceptance agreements for processing payment card transactions. These card acceptance arrangements generally renew automatically and do not have fixed durations. Under these agreements, the Company stands ready to process payment transactions as and when each is presented. The Company earns discount, interchange and similar fees only when transactions are processed. Contractually defined per-transaction fee amounts typically apply to each type of transaction processed and are recognized as revenue at the time each transaction is captured for settlement. These fees are typically collected by the Company as part of the process of settling transactions daily with merchants and acquirers and are fully earned at the time settlement is made. The Company pays issuer interchange to card-issuing entities that have entered into contractual arrangements to issue cards on the Discover Network and on certain transactions on the Diners Club and PULSE networks. This cost is contractually established and is based on the card-issuing organization’s transaction volume. The Company classifies this cost as a reduction of discount and interchange revenue. Costs of cardholder reward arrangements, including the Cashback Bonus reward program, are classified as reductions of discount and interchange revenue pursuant to guidance under Accounting Standards Codification (“ASC”) Topic 606 governing consideration payable to a customer. For both issuer interchange and transaction-based cardholder rewards, the Company accrues the cost at the time each underlying card transaction is captured for settlement. Customer Rewards The Company offers its customers various reward programs, including the Cashback Bonus reward program, pursuant to which the Company pays certain customers a reward equal to a percentage of their credit card purchase amounts based on the type and volume of the customer’s purchases. The liability for customer rewards is recorded on an individual customer basis and is accumulated as qualified customers earn rewards through their ongoing credit card purchase activity or other defined actions. The Company recognizes customer rewards costs as a reduction of the related revenue, if any. In instances where a reward is not associated with a revenue-generating transaction, such as when a reward is given for opening an account, the reward cost is recorded as an operating expense. For the years ended December 31, 2023, 2022 and 2021, rewards costs amounted to $3.1 billion, $3.0 billion and $2.5 billion, respectively. The liability for customer rewards was $2.2 billion at December 31, 2023 and 2022, and is included in accrued expenses and other liabilities on the consolidated statements of financial condition. Protection Products Revenue The Company earns revenue related to fees received for providing ancillary products and services, including payment protection and identity theft protection services, to its credit card customers. A portion of this revenue comprises amounts earned for arranging for the delivery of products offered by third-party service providers. The amount of revenue recorded is generally based on either a percentage of a customer’s outstanding balance or a flat fee, in either case assessed monthly and recognized as earned. These contracts are month-to-month arrangements that are cancellable at any time. The Company recognizes each monthly fee in the period to which the service or coverage relates. Transaction Processing Revenue Transaction processing revenue represents switch fees charged to financial institutions and merchants under network participation agreements for processing ATM and debit transactions over the PULSE network, as well as various participation and membership fees. Network participation agreements generally renew automatically and do not have fixed durations, although the Company does enter into fixed-term pricing or incentive arrangements with certain network participants. Similar to discount and interchange fees, switch fees are contractually defined per-transaction fee amounts and are assessed and recognized as revenue at the time each transaction is captured for settlement. These fees are typically collected by the Company as part of the process of settling transactions with network participants. Membership and other participation fees are recognized over the periods to which each fee relates. Other Income Other income includes gains and losses on equity investments, sales-based royalty revenues earned by Diners Club, merchant fees, revenues from network partners and other miscellaneous revenue items. Unrealized gains and losses on equity investments carried at fair value are recognized quarterly based on changes in their respective fair values. Sales-based royalty revenues are recognized as the related sales are reported by Diners franchisees. All remaining items of other income are recognized as the related performance obligations are satisfied. Future Revenue Associated with Customer Contracts For contracts under which the Company processes payment card transactions, the Company has the right to assess fees for services performed and to collect those fees through the settlement process. The Company generates essentially all of its discount and interchange revenue and transaction processing revenue, as well as some revenue reported as other income, through such contracts. There is no specified quantity of service promised in these contracts as the number of payment transactions is dependent upon cardholder behavior, which is outside the control of the Company and its network customers (i.e., merchants, acquirers, issuers and other network participants). As noted above, these contracts are typically without fixed durations and renew automatically. For these reasons, the Company does not make or disclose an estimate of revenue associated with performance obligations attributable to the remaining terms of these contracts. Future revenue associated with the Company’s sales-based royalty revenues earned from Diners Club licensees is similarly variable and open-ended and therefore the Company does not make or disclose an estimate of royalties associated with performance obligations attributable to the remaining terms of the licensing and royalty arrangements. Because of the nature of the services and the manner of collection associated with the majority of the Company’s revenue from contracts with customers, material receivables or deferred revenues are not generated. Incentive Payments The Company makes certain incentive payments under contractual arrangements with financial institutions, Diners Club licensees, merchants, acquirers and certain other customers. These payments are generally classified as contra-revenue unless a distinct good or service is received by the Company in exchange for the payment and the fair value of the good or service can be reasonably estimated. If no such good or service is identified, then the entire payment is classified as contra-revenue and included in the consolidated statements of income in the line item where the related revenues are recorded. If the payment gives rise to an asset because it is expected to directly or indirectly contribute to future net cash inflows, it is deferred and recognized over the expected benefit period. The unamortized portion of the deferred incentive payments included in other assets on the consolidated statements of financial condition was $27 million and $32 million at December 31, 2023 and 2022, respectively.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2023

Cash and cash equivalents is defined by the Company as cash on deposit with banks, including time deposits and other highly liquid investments with maturities of 90 days or less when purchased, excluding amounts restricted by certain contractual or other obligations. Cash and cash equivalents included $2.0 billion and $1.5 billion of cash and due from banks and $9.7 billion and $7.4 billion of interest-earning deposits at other banks at December 31, 2023 and 2022, respectively.

Restricted Cash

Restricted cash includes cash in accounts from which the Company’s ability to withdraw funds at any time is contractually limited. Restricted cash is generally designated for specific purposes arising out of certain contractual or other obligations.

Investment Securities

At December 31, 2023, investment securities consisted of debt obligations of the U.S. Treasury and government-sponsored enterprises of the U.S. (“U.S. GSEs”) and mortgage-backed securities issued by government agencies or U.S. GSEs. Investment securities that the Company has the positive intent and ability to hold to maturity are classified as held-to-maturity and are reported at amortized cost. All other investment securities are classified as available-for-sale, as the Company does not hold investment securities for trading purposes. Available-for-sale investment securities are reported at fair value with unrealized gains and losses, net of tax, reported as a component of accumulated other comprehensive income (“AOCI”) included in stockholders’ equity. The Company estimates the fair value of available-for-sale investment securities as more fully discussed in Note 20: Fair Value Measurements. The amortized cost for each held-to-maturity and available-for-sale investment security is adjusted for amortization of premiums or accretion of discounts, as appropriate. Such amortization or accretion is included in interest income. Interest on investment securities is accrued each month in accordance with their contractual terms and recorded in other assets in the consolidated statements of financial condition. The U.S. Treasury and U.S. GSE obligations and mortgage-backed securities issued by government agencies or U.S. GSEs in which the Company invests have long histories with no credit losses and are explicitly or implicitly guaranteed by the U.S. government. Therefore, management has concluded that there is no expectation of non-payment on its investment securities and does not record an allowance for credit losses on these investments.

Loan Receivables

Loan receivables consist of credit card receivables and other loan receivables. The carrying values of all classes of loan receivables include unamortized net deferred loan origination fees and costs (also see “— Significant Revenue Recognition Accounting Policies — Loan Interest and Fee Income”). The credit card loan receivables carrying amount includes the principal amounts outstanding and uncollected billed interest and fees and is reduced for unearned revenue related to balance transfer fees (also see “— Significant Revenue Recognition Accounting Policies — Loan Interest and Fee Income”). Other loans consist of private student loans, personal loans and other loans and the carrying amount of those loans includes principal amounts outstanding. For private student loans, principal amounts outstanding also include accrued interest that has been capitalized. The Company’s loan receivables are deemed to be held-for-investment at origination or acquisition because management has the intent and ability to hold them for the foreseeable

future. Cash flows associated with loans originated or acquired for investment are classified as cash flows from investing activities, regardless of a subsequent change in intent.

Delinquent Loans and Charge-Offs

Delinquent Loans and Net Charge-Offs

The entire balance of an account is contractually past due if the minimum payment is not received by the specified date on the customer’s billing statement. Delinquency is reported on loans that are 30 days or more past due.

Credit card loans are charged off at the end of the month during which an account becomes 180 days past due. Closed-end unsecured consumer loan receivables are charged off at the end of the month during which an account becomes 120 days contractually past due. Customer bankruptcies and probate accounts are charged off by the end of the month 60 days following the receipt of notification of the bankruptcy or death, but not later than the 180-day or 120-day time frame described above. Receivables associated with alleged or potential fraudulent transactions are reserved for at their net realizable value upon receipt of notification of such fraud through a charge to other expense and are subsequently written off at the end of the month 90 days following notification, but not later than the contractual 180-day or 120-day time frame described above. The Company’s charge-off policies are designed to comply with guidelines established by the Federal Financial Institutions Examination Council (“FFIEC”).

The Company’s net charge-offs include the principal amount of loans charged off less principal recoveries and exclude charged-off interest and fees, recoveries of interest and fees and fraud losses.

The practice of re-aging an account also may affect loan delinquencies and charge-offs. A re-age is intended to assist delinquent customers who have experienced financial difficulties but who demonstrate both an ability and willingness to repay. Accounts meeting specific criteria are re-aged when the Company and the customer agree on a temporary repayment schedule that may include concessionary terms. With re-aging, the outstanding balance of a delinquent account is returned to a current status. Customers may also qualify for a workout re-age when either a longer term or permanent hardship exists. The Company’s re-age practices are designed to comply with FFIEC guidelines.

Allowance for Credit Losses

The Company maintains an allowance for credit losses at a level that is appropriate to absorb net credit losses anticipated over the remaining expected life of loan receivables as of the balance sheet date. The estimate of expected credit losses considers uncollectible principal, interest and fees associated with the Company's loan receivables existing as of the balance sheet date. Additionally, the estimate includes expected recoveries of amounts that were either previously charged off or are expected to be charged off. The allowance is evaluated quarterly for appropriateness and is maintained through an adjustment to the provision for credit losses. Charge-offs of principal amounts of loans outstanding are deducted from the allowance and subsequent recoveries of such amounts increase the allowance. Charge-offs of loan balances representing unpaid interest and fees result in a reversal of interest and fee income, respectively, which is effectively a reclassification of the provision for credit losses.

The Company calculates its allowance for credit losses by estimating expected credit losses separately for classes of receivables with similar risk characteristics. This results in segmenting the portfolio by loan product type, which is the level that the Company develops and documents its methodology for determining the allowance for credit losses. The estimate of expected credit losses for each loan product type is based on: (i) a reasonable and supportable forecast period; (ii) a reversion period; and (iii) a post-reversion period based on historical information covering the remaining life of the loan, all of which is netted with expected recoveries. The lengths of the reasonable and supportable forecast and reversion periods can vary and are subject to a quarterly assessment that considers the economic outlook and level of variability among macroeconomic forecasts. The Company applies a weighted approach in reverting from the reasonable and supportable forecast period to the post-reversion period.

Several analyses are used to help estimate credit losses anticipated over the remaining expected life of loan receivables as of the balance sheet date. The Company's estimation process includes models that predict customer losses based on risk characteristics and portfolio attributes, macroeconomic variables and historical data and analysis. There is a significant amount of judgment applied in selecting inputs and analyzing the results produced by the models to determine the allowance.

For credit card loans, the Company uses a modeling framework that includes the following components for estimating expected credit losses:

•Probability of default: this component estimates the probability of charge-off at different points in time over the life of each loan.

•Exposure at default: this component estimates the balance on the loan at the time of default. Given that there is no stated life of a receivable balance on a revolving credit card account, the Company applies a percentage of expected payments to estimate the balance that would remain at the time of charge-off.

•Recoveries from charged-off accounts are estimated separately and are netted as part of the aggregation of all of the components of the card loss modeling framework.

•The output of the above three components is adjusted to remove post measurement date activity.

For private student loans and personal loans, the Company uses vintage-based models that estimate expected credit losses over the life of the loan, net of recovery estimates, impacted mainly by time elapsed since origination, credit quality of origination vintages and macroeconomic forecasts.

The components described above for credit card, private student and personal loans are developed utilizing historical data and applicable macroeconomic variable inputs based on statistical analysis and customer behavioral relationships with credit performance. Expected recoveries from loans charged off as of the balance sheet date are modeled separately and included in the allowance estimate. The Company leverages these models and recent macroeconomic forecasts for the portion of the estimate associated with the reasonable and supportable forecast period. To estimate expected credit losses for the remainder of the life of the credit card loans, the Company reverts to historical experience of credit card loans with characteristics similar to those as of the balance sheet date and observed over various phases of a credit cycle. To estimate expected credit losses for the remainder of the life of private student and personal loans, the Company generally reverts to use of average macroeconomic variables over an appropriate historical period.

The considerations in these models include past and current loan performance, loan growth and seasoning, risk management practices, account collection strategies, economic conditions, bankruptcy filings, policy changes and forecasting uncertainties. Consideration of past and current loan performance includes the post-modification performance of loans to borrowers experiencing financial difficulty. For the credit card loan portfolio, the Company estimates its credit losses on a loan-level basis, which includes loans that are delinquent and/or no longer accruing interest and/or loans that have been restructured. For the remainder of its portfolio, including private student, personal and other loans, the Company estimates its credit losses on a pooled basis. For all loan types, recoveries are estimated at a pooled level based on estimates of future cash flows derived using historical experience.

Accrued interest receivable on credit card loans is included in the estimate of expected credit losses once billed to the customer (i.e., once the interest becomes part of the loan balance). Except as noted in the following sentence, an allowance for credit losses is not recorded for unbilled credit card interest or accrued interest receivable on other loan classes as the impact to the allowance for credit losses is not material. Accrued interest receivable on student loans that have not yet entered repayment is included in the estimate of expected credit losses.

No liability for expected credit losses is required for unused lines of credit on the Company’s credit card loans because they are unconditionally cancellable. The Company records a liability for expected credit losses for unfunded commitments on all other loans, which is presented as part of accrued expenses and other liabilities in the consolidated statements of financial condition. This liability is evaluated quarterly for appropriateness and is maintained through an adjustment to the provision for credit losses.

As part of certain collection strategies, the Company may modify the terms of loans to customers experiencing financial hardship. Temporary and permanent modifications on credit card and personal loans, as well as temporary modifications on private student loans and certain grants of private student loan forbearance are generally subject to disclosure as loan modifications to borrowers experiencing financial difficulty.

Loan receivables that have been modified are subject to the same requirements for the accrual of expected credit loss over their expected remaining lives as described above for unmodified loans. The effects of all loan modifications, whether or not they are subject to disclosure as loan modifications to borrowers experiencing financial difficulty, are reflected in the allowance for credit losses.

Premises and Equipment, net

Premises and equipment, net, are stated at cost less provisions for impairment and accumulated depreciation and amortization. Accumulated depreciation and amortization is computed using the straight-line method over the estimated useful lives of the assets. The Company periodically reviews the estimated useful lives and may adjust them as necessary. Buildings are depreciated over a period of thirty-nine years. The costs of improvements are capitalized and depreciated either over the asset’s estimated useful life, typically ten years to fifteen years, or over the remaining term of the lease, when applicable. Furniture and fixtures are depreciated over a period of five years to ten years. Equipment is depreciated over three years to ten years. Maintenance and repairs are immediately expensed when incurred, while the costs of significant improvements are capitalized.

Purchased software and capitalized costs related to internally developed software are amortized over their useful lives of three years to ten years. Costs incurred during the application development stage related to internally developed software are capitalized. Costs are expensed as incurred during the preliminary project stage and post implementation stage. Once the capitalization criteria as defined in GAAP have been met, external direct costs incurred for materials and services used in developing or obtaining internal-use computer software and payroll and payroll-related costs for employees who are directly associated with the internal-use computer software project (to the extent those employees devoted time directly to the project) are capitalized. Amortization of capitalized costs begins when the software is ready for its intended use. Capitalized software is included in premises and equipment, net in the Company’s consolidated statements of financial condition. See Note 6: Premises and Equipment for further information about the Company’s premises and equipment.

Cloud computing arrangements involving the licensing of software that meet certain criteria are recognized as the acquisition of software. Such assets are measured at the present value of the license obligation, if the license is to be paid over time, in addition to any capitalized upfront costs and amortized over the life of the arrangement. Cloud computing arrangements that do not meet the criteria to be recognized as acquired software are accounted for as service contracts. To date, none of the Company’s cloud computing arrangements have met the criteria to be recognized as acquired software.

Premises and equipment are subject to impairment testing when events or conditions indicate that the carrying value of the asset may not be fully recoverable from future cash flows. A test for recoverability is done by comparing the asset’s carrying value to the sum of the undiscounted future net cash inflows expected to be generated from the use of the asset over its remaining useful life. Impairment exists if the sum of the undiscounted expected future net cash inflows is less than the carrying amount of the asset. Impairment would result in a write-down of the asset to its estimated fair value. The estimated fair values of these assets are based on the discounted present value of the stream of future net cash inflows expected to be derived over the remaining useful lives of the assets. If an impairment write-down is recorded, the remaining useful life of the asset will be evaluated to determine whether revision of the remaining amortization or depreciation period is appropriate.

Goodwill

Goodwill is recorded as part of the Company’s acquisitions of businesses when the purchase price exceeds the fair value of the net tangible and separately identifiable intangible assets acquired. The Company’s goodwill is not amortized, but rather is subject to an impairment test at the reporting unit level annually as of October 1, or between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The Company’s reported goodwill relates to PULSE, which it acquired in 2005. The Company’s goodwill is tested for impairment by comparing the fair value of the reporting unit to its carrying value. If the fair value of the reporting unit exceeds its carrying value, goodwill is not impaired. If the carrying value exceeds its fair value, an impairment loss must be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. No impairment was identified during the impairment test conducted as of October 1, 2023.

Stock-based Compensation

The Company measures the cost of services received from employees and non-employee directors in exchange for an award of stock-based compensation based on the grant-date fair value of the award. The cost, net of estimated forfeitures, is recognized over the requisite service period. Awards to employees who are retirement-eligible at any point during the year are amortized over 12 months in accordance with the vesting terms that apply under those circumstances. No compensation cost is recognized for awards that are subsequently forfeited.

Advertising Costs

The Company expenses television and radio advertising costs in the period in which the advertising is first aired and all other advertising costs as incurred. Advertising costs are recorded in marketing and business development and were $359 million, $307 million and $262 million for the years ended December 31, 2023, 2022 and 2021, respectively.

Income Taxes

Income tax expense is provided for using the asset and liability method, under which deferred tax assets and liabilities are determined based on the temporary differences between the financial reporting and income tax bases of assets and liabilities using currently enacted tax rates. Deferred tax assets are recognized when their realization is determined to be more likely than not. A valuation allowance is provided if the Company believes it is more likely than not that all or some portion of the deferred tax asset will not be realized. An increase or decrease in the valuation allowance that results from a change in circumstances and which causes a change in management’s judgment about the realizability of the related deferred tax asset is included in the current tax provision. Uncertain tax positions are measured at the highest amount of tax benefit for which realization is judged to be more likely than not. Tax benefits that do not meet these criteria are unrecognized tax benefits. The Company recognizes and reports interest and penalties, if necessary, related to uncertain tax positions within its provision for income tax expense. See Note 15: Income Taxes for more information about the Company’s income taxes.

Accumulated Other Comprehensive Income

The Company records unrealized gains and losses on available-for-sale securities, changes in the fair value of cash flow hedges and certain pension and foreign currency translation adjustments in other comprehensive income (“OCI”) on an after-tax basis where applicable. The Company’s policy is to adjust the tax effects of a component of AOCI in the same period in which the item is sold or otherwise derecognized, or when the carrying value of the item is remeasured. Details of OCI, net of tax, are presented in the statement of comprehensive income and a roll forward of AOCI is presented in the consolidated statements of changes in stockholders’ equity and Note 13: Accumulated Other Comprehensive Income.

Significant Revenue Recognition Accounting Policies, Loan Interest and Fee Income

Significant Revenue Recognition Accounting Policies

Loan Interest and Fee Income

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.

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, 2023 and 2022, deferred revenues related to balance transfer fees, recorded as a reduction of loan receivables, were $107 million and $85 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.

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, 2023 and 2022, the remaining unamortized deferred costs related to loan origination were $306 million and $298 million, respectively, and were recorded in loan receivables.

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.

Interest income from loans disclosed as modifications to borrowers experiencing financial difficulty 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 have not been modified.

Significant Revenue Recognition Accounting Policies, Other

Discount and Interchange Revenue

The Company earns discount revenue from fees charged to merchants with whom it has entered into card acceptance agreements for processing credit card purchase transactions. The Company earns acquirer interchange revenue primarily from merchant acquirers on Discover Network, Diners Club and PULSE transactions made by credit and debit card customers at merchants with whom merchant acquirers have entered into card acceptance agreements for processing payment card transactions. These card acceptance arrangements generally renew automatically and do not have fixed durations. Under these agreements, the Company stands ready to process payment transactions as and when each is presented. The Company earns discount, interchange and similar fees only when transactions are processed. Contractually defined per-transaction fee amounts typically apply to each type of transaction processed and are recognized as revenue at the time each transaction is captured for settlement. These fees are typically collected by the Company as part of the process of settling transactions daily with merchants and acquirers and are fully earned at the time settlement is made.

The Company pays issuer interchange to card-issuing entities that have entered into contractual arrangements to issue cards on the Discover Network and on certain transactions on the Diners Club and PULSE networks. This cost is contractually established and is based on the card-issuing organization’s transaction volume. The Company classifies this cost as a reduction of discount and interchange revenue. Costs of cardholder reward arrangements, including the Cashback Bonus reward program, are classified as reductions of discount and interchange revenue pursuant to guidance under Accounting Standards Codification (“ASC”) Topic 606 governing consideration payable to a customer. For both issuer interchange and transaction-based cardholder rewards, the Company accrues the cost at the time each underlying card transaction is captured for settlement.

Customer Rewards

The Company offers its customers various reward programs, including the Cashback Bonus reward program, pursuant to which the Company pays certain customers a reward equal to a percentage of their credit card purchase amounts based on the type and volume of the customer’s purchases. The liability for customer rewards is recorded on an individual customer basis and is accumulated as qualified customers earn rewards through their ongoing credit card purchase activity or other defined actions. The Company recognizes customer rewards costs as a reduction of the related revenue, if any. In instances where a reward is not associated with a revenue-generating transaction, such as when a reward is given for opening an account, the reward cost is recorded as an operating expense. For the years ended December 31, 2023, 2022 and 2021, rewards costs amounted to $3.1 billion, $3.0 billion and $2.5 billion, respectively. The liability for customer rewards was $2.2 billion at December 31, 2023 and 2022, and is included in accrued expenses and other liabilities on the consolidated statements of financial condition.

Protection Products Revenue

The Company earns revenue related to fees received for providing ancillary products and services, including payment protection and identity theft protection services, to its credit card customers. A portion of this revenue comprises amounts earned for arranging for the delivery of products offered by third-party service providers. The amount of revenue recorded is generally based on either a percentage of a customer’s outstanding balance or a flat fee, in either case assessed monthly and recognized as earned. These contracts are month-to-month arrangements that are cancellable at any time. The Company recognizes each monthly fee in the period to which the service or coverage relates.

Transaction Processing Revenue

Transaction processing revenue represents switch fees charged to financial institutions and merchants under network participation agreements for processing ATM and debit transactions over the PULSE network, as well as various participation and membership fees. Network participation agreements generally renew automatically and do not have fixed durations, although the Company does enter into fixed-term pricing or incentive arrangements with certain network participants. Similar to discount and interchange fees, switch fees are contractually defined per-transaction fee amounts and are assessed and recognized as revenue at the time each transaction is captured for settlement. These fees are typically collected by the Company as part of the process of settling transactions with network participants. Membership and other participation fees are recognized over the periods to which each fee relates.

Other Income

Other income includes gains and losses on equity investments, sales-based royalty revenues earned by Diners Club, merchant fees, revenues from network partners and other miscellaneous revenue items. Unrealized gains and losses on equity investments carried at fair value are recognized quarterly based on changes in their respective fair values. Sales-based royalty revenues are recognized as the related sales are reported by Diners franchisees. All remaining items of other income are recognized as the related performance obligations are satisfied.

Future Revenue Associated with Customer Contracts

For contracts under which the Company processes payment card transactions, the Company has the right to assess fees for services performed and to collect those fees through the settlement process. The Company generates essentially all of its discount and interchange revenue and transaction processing revenue, as well as some revenue reported as other income, through such contracts. There is no specified quantity of service promised in these contracts as the number of payment transactions is dependent upon cardholder behavior, which is outside the control of the Company and its network customers (i.e., merchants, acquirers, issuers and other network participants). As noted above, these contracts are typically without fixed durations and renew automatically. For these reasons, the Company does not make or disclose an estimate of revenue associated with performance obligations attributable to the remaining terms of these contracts. Future revenue associated with the Company’s sales-based royalty revenues earned from Diners Club licensees is similarly variable and open-ended and therefore the Company does not make or disclose an estimate of royalties associated with performance obligations attributable to the remaining terms of the licensing and royalty arrangements. Because of the nature of the services and the manner of collection associated with the majority of the Company’s revenue from contracts with customers, material receivables or deferred revenues are not generated.

Incentive Payments

The Company makes certain incentive payments under contractual arrangements with financial institutions, Diners Club licensees, merchants, acquirers and certain other customers. These payments are generally classified as contra-revenue unless a distinct good or service is received by the Company in exchange for the payment and the fair value of the good or service can be reasonably estimated. If no such good or service is identified, then the entire payment is classified as contra-revenue and included in the consolidated statements of income in the line item where the related revenues are recorded. If the payment gives rise to an asset because it is expected to directly or indirectly contribute to future net cash inflows, it is deferred and recognized over the expected benefit period. The unamortized portion of the deferred incentive payments included in other assets on the consolidated statements of financial condition was $27 million and $32 million at December 31, 2023 and 2022, respectively.