Regulatory Matters - Narrative (Details) $ in Millions |
12 Months Ended |
|---|---|
|
Dec. 31, 2025
USD ($)
| |
| Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] | |
| Short-term investments held for discharge of obligations | $ 4,900 |
| KeyBank (consolidated) | |
| Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] | |
| Dividends paid by non banking subsidiaries | 1,400 |
| Capacity to pay dividends | $ 783 |