| Consolidated Balance Sheets | |||||||||||||||||
| (dollars in millions) | |||||||||||||||||
| 3/31/2026 | 12/31/2025 | 3/31/2025 | |||||||||||||||
| Assets | |||||||||||||||||
| Loans | $ | 109,190 | $ | 106,541 | $ | 104,809 | |||||||||||
| Loans held for sale | 876 | 1,077 | 811 | ||||||||||||||
| Securities available for sale | 38,918 | 39,596 | 40,751 | ||||||||||||||
| Held-to-maturity securities | 9,116 | 8,622 | 7,160 | ||||||||||||||
| Trading account assets | 783 | 1,061 | 1,296 | ||||||||||||||
| Short-term investments | 11,782 | 10,163 | 15,349 | ||||||||||||||
| Other investments | 1,204 | 949 | 1,050 | ||||||||||||||
| Total earning assets | 171,869 | 168,009 | 171,226 | ||||||||||||||
| Allowance for loan and lease losses | (1,449) | (1,427) | (1,429) | ||||||||||||||
| Cash and due from banks | 1,130 | 1,287 | 1,909 | ||||||||||||||
| Premises and equipment | 618 | 628 | 602 | ||||||||||||||
| Goodwill | 2,752 | 2,752 | 2,752 | ||||||||||||||
| Other intangible assets | 5 | 8 | 22 | ||||||||||||||
| Corporate-owned life insurance | 4,439 | 4,432 | 4,404 | ||||||||||||||
| Accrued income and other assets | 9,100 | 8,481 | 8,958 | ||||||||||||||
| Discontinued assets | 199 | 211 | 247 | ||||||||||||||
| Total assets | $ | 188,663 | $ | 184,381 | $ | 188,691 | |||||||||||
| Liabilities | |||||||||||||||||
| Deposits in domestic offices: | |||||||||||||||||
| Interest-bearing deposits | 120,220 | 121,100 | 122,283 | ||||||||||||||
| Noninterest-bearing deposits | 27,595 | 27,613 | 28,454 | ||||||||||||||
| Total deposits | 147,815 | 148,713 | 150,737 | ||||||||||||||
| Federal funds purchased and securities sold under repurchase agreements | 34 | 13 | 22 | ||||||||||||||
| Bank notes and other short-term borrowings | 6,149 | 1,071 | 2,328 | ||||||||||||||
| Accrued expense and other liabilities | 3,801 | 4,286 | 4,209 | ||||||||||||||
| Long-term debt | 10,877 | 9,917 | 12,392 | ||||||||||||||
| Total liabilities | 168,676 | 164,000 | 169,688 | ||||||||||||||
| Equity | |||||||||||||||||
| Preferred stock | 2,500 | 2,500 | 2,500 | ||||||||||||||
| Common shares | 1,257 | 1,257 | 1,257 | ||||||||||||||
| Capital surplus | 5,981 | 6,035 | 5,946 | ||||||||||||||
| Retained earnings | 15,622 | 15,359 | 14,724 | ||||||||||||||
| Treasury stock, at cost | (3,152) | (2,810) | (2,637) | ||||||||||||||
| Accumulated other comprehensive income (loss) | (2,221) | (1,960) | (2,787) | ||||||||||||||
| Total equity | 19,987 | 20,381 | 19,003 | ||||||||||||||
| Total liabilities and equity | $ | 188,663 | $ | 184,381 | $ | 188,691 | |||||||||||
| Common shares outstanding (000) | 1,087,293 | 1,102,401 | 1,111,986 | ||||||||||||||
| Consolidated Statements of Income | |||||||||||||||||
| (dollars in millions, except per share amounts) | |||||||||||||||||
| Three months ended | |||||||||||||||||
| 3/31/2026 | 12/31/2025 | 3/31/2025 | |||||||||||||||
| Interest income | |||||||||||||||||
| Loans | $ | 1,416 | $ | 1,439 | $ | 1,401 | |||||||||||
| Loans held for sale | 14 | 18 | 14 | ||||||||||||||
| Securities available for sale | 370 | 388 | 392 | ||||||||||||||
| Held-to-maturity securities | 86 | 76 | 63 | ||||||||||||||
| Trading account assets | 11 | 12 | 17 | ||||||||||||||
| Short-term investments | 103 | 137 | 174 | ||||||||||||||
| Other investments | 5 | 8 | 9 | ||||||||||||||
| Total interest income | 2,005 | 2,078 | 2,070 | ||||||||||||||
| Interest expense | |||||||||||||||||
| Deposits | 598 | 688 | 753 | ||||||||||||||
| Federal funds purchased and securities sold under repurchase agreements | 14 | 4 | 1 | ||||||||||||||
| Bank notes and other short-term borrowings | 20 | 9 | 27 | ||||||||||||||
| Long-term debt | 151 | 162 | 193 | ||||||||||||||
| Total interest expense | 783 | 863 | 974 | ||||||||||||||
| Net interest income | 1,222 | 1,215 | 1,096 | ||||||||||||||
| Provision for credit losses | 106 | 108 | 118 | ||||||||||||||
| Net interest income after provision for credit losses | 1,116 | 1,107 | 978 | ||||||||||||||
| Noninterest income | |||||||||||||||||
| Trust and investment services income | 157 | 156 | 139 | ||||||||||||||
| Investment banking and debt placement fees | 197 | 243 | 175 | ||||||||||||||
| Service charges on deposit accounts | 77 | 78 | 69 | ||||||||||||||
| Operating lease income and other leasing gains | 8 | 9 | 9 | ||||||||||||||
| Corporate services income | 71 | 81 | 65 | ||||||||||||||
| Cards and payments income | 86 | 84 | 82 | ||||||||||||||
| Corporate-owned life insurance income | 34 | 40 | 33 | ||||||||||||||
| Consumer mortgage income | 13 | 16 | 13 | ||||||||||||||
| Commercial mortgage servicing fees | 62 | 68 | 76 | ||||||||||||||
| Other income | 18 | 7 | 7 | ||||||||||||||
| Net securities gains (losses) | — | — | — | ||||||||||||||
| Total noninterest income | 723 | 782 | 668 | ||||||||||||||
| Noninterest expense | |||||||||||||||||
| Personnel | 743 | 790 | 680 | ||||||||||||||
| Net occupancy | 68 | 69 | 67 | ||||||||||||||
| Computer processing | 111 | 106 | 107 | ||||||||||||||
| Business services and professional fees | 36 | 61 | 40 | ||||||||||||||
| Equipment | 19 | 22 | 20 | ||||||||||||||
| Operating lease expense | 7 | 8 | 11 | ||||||||||||||
| Marketing | 18 | 28 | 21 | ||||||||||||||
| Intangible asset amortization | — | — | — | ||||||||||||||
| Other expense | 179 | 157 | 185 | ||||||||||||||
| Total noninterest expense | 1,181 | 1,241 | 1,131 | ||||||||||||||
| Income (loss) from continuing operations before income taxes | 658 | 648 | 515 | ||||||||||||||
| Income taxes | 136 | 139 | 109 | ||||||||||||||
| Income (loss) from continuing operations | 522 | 509 | 406 | ||||||||||||||
| Income (loss) from discontinued operations, net of taxes | — | 1 | (1) | ||||||||||||||
| Net income (loss) | 522 | 510 | 405 | ||||||||||||||
| Less: Net income (loss) attributable to noncontrolling interests | — | — | — | ||||||||||||||
| Net income (loss) attributable to Key | $ | 522 | $ | 510 | $ | 405 | |||||||||||
| Income (loss) from continuing operations attributable to Key common shareholders | $ | 486 | $ | 474 | $ | 370 | |||||||||||
| Net income (loss) attributable to Key common shareholders | 486 | 475 | 369 | ||||||||||||||
| Per common share | |||||||||||||||||
| Income (loss) from continuing operations attributable to Key common shareholders | $ | .45 | $ | .43 | $ | .34 | |||||||||||
| Income (loss) from discontinued operations, net of taxes | — | — | — | ||||||||||||||
Net income (loss) attributable to Key common shareholders (a) | .45 | .43 | .34 | ||||||||||||||
| Per common share — assuming dilution | |||||||||||||||||
| Income (loss) from continuing operations attributable to Key common shareholders | $ | .44 | $ | .43 | $ | .33 | |||||||||||
| Income (loss) from discontinued operations, net of taxes | — | — | — | ||||||||||||||
Net income (loss) attributable to Key common shareholders (a) | .44 | .43 | $ | .33 | |||||||||||||
| Cash dividends declared per common share | $ | .205 | $ | .205 | $ | .205 | |||||||||||
| Weighted-average common shares outstanding (000) | 1,084,277 | 1,095,171 | 1,096,654 | ||||||||||||||
Effect of common share options and other stock awards (b) | 10,091 | 11,152 | 9,486 | ||||||||||||||
Weighted-average common shares and potential common shares outstanding (000) (c) | 1,094,368 | 1,106,323 | 1,106,140 | ||||||||||||||