Goodwill and Other Intangible Assets - Narrative (Details) $ in Millions |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
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Jan. 01, 2026
USD ($)
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Sep. 30, 2026
USD ($)
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Mar. 31, 2026
segment
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Sep. 30, 2026
USD ($)
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Dec. 31, 2025
USD ($)
segment
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| Goodwill [Line Items] | |||||
| Number of reportable segments | segment | 2 | 1 | |||
| Number of operating segments | segment | 1 | ||||
| Goodwill | $ 1,849 | $ 3,484 | $ 3,484 | $ 1,849 | |
| Disposition of investment | 5 | 5 | |||
| Gain on disposition of business | 4 | ||||
| Synovus Financial Corp | |||||
| Goodwill [Line Items] | |||||
| Goodwill | 1,640 | $ 1,600 | $ 1,600 | ||
| Other identifiable intangible assets | 1,110 | ||||
| Synovus Financial Corp | CDI | |||||
| Goodwill [Line Items] | |||||
| Other identifiable intangible assets | $ 848 | ||||
| Acquired finite-lived intangible assets, useful life | 10 years | ||||
| Synovus Financial Corp | Wealth Customer Relationships | |||||
| Goodwill [Line Items] | |||||
| Other identifiable intangible assets | $ 262 | ||||
| Acquired finite-lived intangible assets, useful life | 14 years | ||||
| X | ||||||||||
- Definition Weighted-average period of amortization for finite-lived intangible asset acquired in business combination, asset acquisition, and from joint venture formation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of identifiable finite-lived intangible asset acquired in business combination and recognized at acquisition date. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of decrease in goodwill acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized, from divestiture. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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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. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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