| Consolidated Balance Sheets | |||||||||||||||||
| (dollars in millions) | |||||||||||||||||
| 6/30/2025 | 3/31/2025 | 6/30/2024 | |||||||||||||||
| Assets | |||||||||||||||||
| Loans | $ | 106,389 | $ | 104,809 | $ | 107,078 | |||||||||||
| Loans held for sale | 530 | 811 | 517 | ||||||||||||||
| Securities available for sale | 40,669 | 40,751 | 37,460 | ||||||||||||||
| Held-to-maturity securities | 6,914 | 7,160 | 7,968 | ||||||||||||||
| Trading account assets | 1,374 | 1,296 | 1,219 | ||||||||||||||
| Short-term investments | 11,564 | 15,349 | 15,536 | ||||||||||||||
| Other investments | 1,058 | 1,050 | 1,259 | ||||||||||||||
| Total earning assets | 168,498 | 171,226 | 171,037 | ||||||||||||||
| Allowance for loan and lease losses | (1,446) | (1,429) | (1,547) | ||||||||||||||
| Cash and due from banks | 1,766 | 1,909 | 1,326 | ||||||||||||||
| Premises and equipment | 599 | 602 | 631 | ||||||||||||||
| Goodwill | 2,752 | 2,752 | 2,752 | ||||||||||||||
| Other intangible assets | 18 | 22 | 41 | ||||||||||||||
| Corporate-owned life insurance | 4,423 | 4,404 | 4,382 | ||||||||||||||
| Accrued income and other assets | 8,654 | 8,958 | 8,532 | ||||||||||||||
| Discontinued assets | 235 | 247 | 296 | ||||||||||||||
| Total assets | $ | 185,499 | $ | 188,691 | $ | 187,450 | |||||||||||
| Liabilities | |||||||||||||||||
| Deposits in domestic offices: | |||||||||||||||||
| Interest-bearing deposits | 119,230 | 122,283 | 117,570 | ||||||||||||||
| Noninterest-bearing deposits | 27,675 | 28,454 | 28,150 | ||||||||||||||
| Total deposits | 146,905 | 150,737 | 145,720 | ||||||||||||||
| Federal funds purchased and securities sold under repurchase agreements | 20 | 22 | 25 | ||||||||||||||
| Bank notes and other short-term borrowings | 2,754 | 2,328 | 5,292 | ||||||||||||||
| Accrued expense and other liabilities | 4,273 | 4,209 | 4,755 | ||||||||||||||
| Long-term debt | 12,063 | 12,392 | 16,869 | ||||||||||||||
| Total liabilities | 166,015 | 169,688 | 172,661 | ||||||||||||||
| Equity | |||||||||||||||||
| Preferred stock | 2,500 | 2,500 | 2,500 | ||||||||||||||
| Common shares | 1,257 | 1,257 | 1,257 | ||||||||||||||
| Capital surplus | 5,971 | 5,946 | 6,185 | ||||||||||||||
| Retained earnings | 14,886 | 14,724 | 15,706 | ||||||||||||||
| Treasury stock, at cost | (2,629) | (2,637) | (5,715) | ||||||||||||||
| Accumulated other comprehensive income (loss) | (2,501) | (2,787) | (5,144) | ||||||||||||||
| Total equity | 19,484 | 19,003 | 14,789 | ||||||||||||||
| Total liabilities and equity | $ | 185,499 | $ | 188,691 | $ | 187,450 | |||||||||||
| Common shares outstanding (000) | 1,112,453 | 1,111,986 | 943,200 | ||||||||||||||
| Consolidated Statements of Income | |||||||||||||||||
| (dollars in millions, except per share amounts) | |||||||||||||||||
| Three months ended | |||||||||||||||||
| 6/30/2025 | 3/31/2025 | 6/30/2024 | |||||||||||||||
| Interest income | |||||||||||||||||
| Loans | $ | 1,443 | $ | 1,401 | $ | 1,524 | |||||||||||
| Loans held for sale | 11 | 14 | 8 | ||||||||||||||
| Securities available for sale | 411 | 392 | 259 | ||||||||||||||
| Held-to-maturity securities | 61 | 63 | 73 | ||||||||||||||
| Trading account assets | 16 | 17 | 16 | ||||||||||||||
| Short-term investments | 157 | 174 | 192 | ||||||||||||||
| Other investments | 8 | 9 | 16 | ||||||||||||||
| Total interest income | 2,107 | 2,070 | 2,088 | ||||||||||||||
| Interest expense | |||||||||||||||||
| Deposits | 730 | 753 | 817 | ||||||||||||||
| Federal funds purchased and securities sold under repurchase agreements | 4 | 1 | 1 | ||||||||||||||
| Bank notes and other short-term borrowings | 34 | 27 | 51 | ||||||||||||||
| Long-term debt | 198 | 193 | 332 | ||||||||||||||
| Total interest expense | 966 | 974 | 1,201 | ||||||||||||||
| Net interest income | 1,141 | 1,096 | 887 | ||||||||||||||
| Provision for credit losses | 138 | 118 | 100 | ||||||||||||||
| Net interest income after provision for credit losses | 1,003 | 978 | 787 | ||||||||||||||
| Noninterest income | |||||||||||||||||
| Trust and investment services income | 146 | 139 | 139 | ||||||||||||||
| Investment banking and debt placement fees | 178 | 175 | 126 | ||||||||||||||
| Service charges on deposit accounts | 73 | 69 | 66 | ||||||||||||||
| Operating lease income and other leasing gains | 14 | 9 | 21 | ||||||||||||||
| Corporate services income | 76 | 65 | 68 | ||||||||||||||
| Cards and payments income | 85 | 82 | 85 | ||||||||||||||
| Corporate-owned life insurance income | 32 | 33 | 34 | ||||||||||||||
| Consumer mortgage income | 15 | 13 | 16 | ||||||||||||||
| Commercial mortgage servicing fees | 70 | 76 | 61 | ||||||||||||||
| Other income | 1 | 7 | 21 | ||||||||||||||
| Net securities gains (losses) | — | — | (10) | ||||||||||||||
| Total noninterest income | 690 | 668 | 627 | ||||||||||||||
| Noninterest expense | |||||||||||||||||
| Personnel | 705 | 680 | 636 | ||||||||||||||
| Net occupancy | 69 | 67 | 66 | ||||||||||||||
| Computer processing | 107 | 107 | 101 | ||||||||||||||
| Business services and professional fees | 48 | 40 | 37 | ||||||||||||||
| Equipment | 21 | 20 | 20 | ||||||||||||||
| Operating lease expense | 10 | 11 | 17 | ||||||||||||||
| Marketing | 24 | 21 | 21 | ||||||||||||||
| Intangible asset amortization | — | — | — | ||||||||||||||
| Other expense | 170 | 185 | 181 | ||||||||||||||
| Total noninterest expense | 1,154 | 1,131 | 1,079 | ||||||||||||||
| Income (loss) from continuing operations before income taxes | 539 | 515 | 335 | ||||||||||||||
| Income taxes | 116 | 109 | 62 | ||||||||||||||
| Income (loss) from continuing operations | 423 | 406 | 273 | ||||||||||||||
| Income (loss) from discontinued operations, net of taxes | 2 | (1) | 1 | ||||||||||||||
| Net income (loss) | 425 | 405 | 274 | ||||||||||||||
| Less: Net income (loss) attributable to noncontrolling interests | — | — | — | ||||||||||||||
| Net income (loss) attributable to Key | $ | 425 | $ | 405 | $ | 274 | |||||||||||
| Income (loss) from continuing operations attributable to Key common shareholders | $ | 387 | $ | 370 | $ | 237 | |||||||||||
| Net income (loss) attributable to Key common shareholders | 389 | 369 | 238 | ||||||||||||||
| Per common share | |||||||||||||||||
| Income (loss) from continuing operations attributable to Key common shareholders | $ | .35 | $ | .34 | $ | .25 | |||||||||||
| Income (loss) from discontinued operations, net of taxes | — | — | — | ||||||||||||||
Net income (loss) attributable to Key common shareholders (a) | .35 | .34 | .25 | ||||||||||||||
| Per common share — assuming dilution | |||||||||||||||||
| Income (loss) from continuing operations attributable to Key common shareholders | $ | .35 | $ | .33 | $ | .25 | |||||||||||
| Income (loss) from discontinued operations, net of taxes | — | — | — | ||||||||||||||
Net income (loss) attributable to Key common shareholders (a) | .35 | .33 | $ | .25 | |||||||||||||
| Cash dividends declared per common share | $ | .205 | $ | .205 | $ | .205 | |||||||||||
| Weighted-average common shares outstanding (000) | 1,100,033 | 1,096,654 | 931,726 | ||||||||||||||
Effect of common share options and other stock awards (b) | 7,177 | 9,486 | 6,761 | ||||||||||||||
Weighted-average common shares and potential common shares outstanding (000) (c) | 1,107,210 | 1,106,140 | 938,487 | ||||||||||||||