BUSINESS COMBINATIONS - Pro Forma (Details) - Veritex and Cadence - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Business Combination [Line Items] | ||||
| Acquisition-related expenses | $ 117 | $ 590 | ||
| Net income attributable to Huntington | 733 | $ 753 | 1,932 | $ 2,091 |
| Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet | ||||
| Business Combination [Line Items] | ||||
| Pro forma revenue | 2,072 | 2,041 | 6,148 | 5,920 |
| Location, Statement of Income, Balance [Axis]: us-gaap:NoninterestIncome | ||||
| Business Combination [Line Items] | ||||
| Pro forma revenue | $ 722 | $ 736 | $ 2,246 | $ 1,914 |
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- Definition Amount, after tax, of pro forma income (loss) of combined entity as if acquisition date of business combination occurred as of beginning of period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of pro forma revenue of combined entity as if acquisition date of business combination occurred as of beginning of period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of expense for acquisition-related cost incurred to effect business combination. Includes, but is not limited to, finder's fee; advisory, legal, accounting, valuation, and other professional and consulting fees; and general administrative cost, including cost of maintaining internal acquisition department. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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