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Business Segments and Revenue from Contracts with Customers - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) segment | Jun. 30, 2024 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of operating segments | segment |  |  | 3 |
Marketing | $ 1,345 | $ 1,064 | $ 2,547 | $ 2,074
Credit card marketing expense | $ 1,100 | $ 907 | 2,200 | $ 1,800
Minimum | Commercial Banking |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Customer net revenue range |  |  | 20 |
Maximum | Commercial Banking |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Customer net revenue range |  |  | $ 2,000 |

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- Definition Credit Card Marketing Expense + References No definition available. + Details
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- Definition Customer Net Revenue Range + References No definition available. + Details
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- Definition Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 49 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-49 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-18 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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