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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes in Carrying Amount of Goodwill | Changes in the carrying amount of goodwill by reporting segment are presented in the following table:
Dollars in millions | Consumer Bank | Commercial Bank | Total(a)
BALANCE AT DECEMBER 31, 2023 | $ | 1,819 |  | $ | 933 |  | $ | 2,752 |
BALANCE AT DECEMBER 31, 2024 | 1,819 |  | 933 |  | 2,752 |
BALANCE AT DECEMBER 31, 2025 | $ | 1,819 |  | $ | 933 |  | $ | 2,752 |
(a) There were no accumulated impairment losses related to any of Key’s reporting units at December 31, 2025, December 31, 2024, and December 31, 2023.
Schedule of Gross Carrying Amount and Accumulated Amortization of Intangible Assets | The following table shows the gross carrying amount and the accumulated amortization of intangible assets subject to amortization:
| 2025 |  | 2024
December 31, Dollars in millions | Gross Carrying Amount | Accumulated Amortization |  | Gross Carrying Amount | Accumulated Amortization
Intangible assets subject to amortization: |  |  |  |  |
Core deposit intangibles | $ | 356 |  | $ | 352 |  |  | $ | 356 |  | $ | 342 |
PCCR intangibles | 16 |  | 16 |  |  | 16 |  | 16 |
Other intangible assets | 154 |  | 150 |  |  | 154 |  | 141 |
Total | $ | 526 |  | $ | 518 |  |  | $ | 526 |  | $ | 499 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | The following table presents estimated intangible asset amortization expense for the next five years.
| Estimated
Dollars in millions | 2026 | 2027 | 2028 | 2029 | 2030
Intangible asset amortization expense | $ | 7 |  | $ | 1 |  | $ | — |  | $ | — |  | $ | — |

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