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Operating Segments - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2026 USD ($) segment | Jun. 30, 2025 USD ($)
Segment Reporting [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 2 |
Number of operating segments | segment |  |  | 2 |
Decrease in net interest income | $ (3,621) | $ (3,587) | $ (7,220) | $ (7,094)
CSBB |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Decrease in net interest income | (1,624) | (1,496) | (3,229) | (2,931)
CSBB | Reclassification, Segmentation Basis Change, Adjustment |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Decrease in net interest income |  | 27 |  | 56
WB |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Decrease in net interest income | $ (1,942) | (1,872) | $ (3,864) | (3,756)
WB | Reclassification, Segmentation Basis Change, Adjustment |  |  |  |
Segment Reporting [Line Items] |  |  |  |
Decrease in net interest income |  | $ 99 |  | $ 196

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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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