Consolidated Statements of Income - USD ($) $ in Millions |
12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Interest income | |||||||||||
| Credit card loans | $ 8,985 | $ 9,690 | $ 8,835 | ||||||||
| Other loans | 1,817 | 1,871 | 1,726 | ||||||||
| Investment securities | 252 | 179 | 40 | ||||||||
| Other interest income | 41 | 253 | 292 | ||||||||
| Total interest income | 11,095 | 11,993 | 10,893 | ||||||||
| Interest expense | |||||||||||
| Deposits | 1,231 | 1,587 | 1,238 | ||||||||
| Short-term borrowings | 32 | 0 | 0 | ||||||||
| Long-term borrowings | 602 | 943 | 901 | ||||||||
| Total interest expense | 1,865 | 2,530 | 2,139 | ||||||||
| Net interest income | 9,230 | 9,463 | 8,754 | ||||||||
| Provision for credit losses | [1],[2] | 5,134 | 3,231 | [3] | 3,035 | [3] | |||||
| Net interest income after provision for credit losses | 4,096 | 6,232 | 5,719 | ||||||||
| Other income | |||||||||||
| Discount and interchange revenue, net | 933 | 1,066 | 1,074 | ||||||||
| Protection products revenue | 180 | 194 | 204 | ||||||||
| Loan fee income | 414 | 449 | 402 | ||||||||
| Transaction processing revenue | 195 | 197 | 178 | ||||||||
| Gains (losses) on equity investments | 80 | (3) | 0 | ||||||||
| Other income | 56 | 93 | 97 | ||||||||
| Total other income | 1,858 | 1,996 | 1,955 | ||||||||
| Other expense | |||||||||||
| Employee compensation and benefits | 1,894 | 1,738 | 1,627 | ||||||||
| Marketing and business development | 659 | 883 | 857 | ||||||||
| Information processing and communications | 540 | 409 | 350 | ||||||||
| Professional fees | 717 | 753 | 672 | ||||||||
| Premises and equipment | 113 | 107 | 102 | ||||||||
| Other expense | 596 | 503 | 469 | ||||||||
| Total other expense | 4,519 | 4,393 | 4,077 | ||||||||
| Income before income tax expense | 1,435 | 3,835 | 3,597 | ||||||||
| Income tax expense | 294 | 878 | 855 | ||||||||
| Net income | 1,141 | 2,957 | 2,742 | ||||||||
| Supplemental Income Statement Elements [Abstract] | |||||||||||
| Net income (loss) available to common stockholders, diluted | 1,104 | 2,908 | 2,689 | ||||||||
| Net income (loss) available to common stockholders, basic | $ 1,104 | $ 2,908 | $ 2,689 | ||||||||
| Basic earnings per common share | $ 3.60 | $ 9.09 | $ 7.81 | ||||||||
| Diluted earnings per common share | $ 3.60 | $ 9.08 | $ 7.79 | ||||||||
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| X | ||||||||||
- Definition Includes discount revenue and acquirer interchange net of interchange paid to third-party issuers. Discount revenue is earned from fees charged to merchants with whom the entity has entered into card acceptance agreements for processing cardholder purchase transactions and acquirer interchange revenue from merchant acquirers on all Discover Network card transactions made by cardholders at merchants with whom merchant acquirers have entered into card acceptance agreements for processing cardholder purchase transactions. No definition available.
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- Definition Loan Fee Income No definition available.
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- Definition Protection products revenue No definition available.
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- Definition Revenues earned from switch fees charged to financial institutions for accessing our network to process transactions and various participation and membership fees. Switch fees are charged on a per transaction basis. No definition available.
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- Definition The amount of expense in the period for communications and data processing expense. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of realized and unrealized gain (loss) on investment. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities. No definition available.
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| X | ||||||||||
- Definition Interest and fee income from credit card balances due from individuals. Such loans are considered revolving credit arrangements. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Interest and fee income from other loans extended to individual consumers. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of the cost of borrowed funds accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Aggregate amount of interest expense on all deposits. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Aggregate amount of interest paid or due on all long-term debt. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The aggregate interest expense incurred on short-term borrowings including commercial paper and Federal funds purchased and securities sold under agreements to repurchase. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The net amount of operating interest income (expense). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The total expense recognized in the period for promotion, public relations, and brand or product advertising. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Total aggregate amount of all noninterest expense. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Represents the total of noninterest income derived from certain activities and assets including (for example): (1) venture capital investments; (2) bank owned life insurance; (3) foreign currency transactions; and (4) mortgage servicing rights. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount, after discount, accretion and premium amortization, of interest income and dividend income classified as other. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of noninterest expense classified as other. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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