v3.26.1
Condensed Financial Information of the Parent Company - Condensed Statements of Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
INCOME      
Other income $ 23 $ 23 $ 46
Total interest income 8,386 8,427 7,927
EXPENSE      
Interest on long-term debt with subsidiary trusts 734 1,187 1,305
Income tax (expense) benefit (476) 143 (196)
NET INCOME (LOSS) 1,829 (161) 967
Total other comprehensive income (loss), net of tax 1,510 1,759 1,066
Comprehensive income (loss) attributable to Key 3,339 1,598 2,033
Parent      
INCOME      
Interest income from subsidiaries 16 20 15
Other income 16 14 24
Total interest income 1,407 784 714
EXPENSE      
Interest on long-term debt with subsidiary trusts 30 33 33
Interest on other borrowed funds 317 341 273
Personnel and other expense 84 77 111
Total expense 431 451 417
Income (loss) from continuing operations before income taxes (TE) 976 333 297
Income tax (expense) benefit 80 94 95
Income (loss) before equity in net income (loss) less dividends from subsidiaries 1,056 427 392
Equity in net income (loss) less dividends from subsidiaries 773 (588) 575
NET INCOME (LOSS) 1,829 (161) 967
Total other comprehensive income (loss), net of tax 1,510 1,759 1,066
Comprehensive income (loss) attributable to Key 3,339 1,598 2,033
Parent | Banks      
INCOME      
Dividends from subsidiaries: 1,375 750 675
Parent | Nonbank subsidiaries      
INCOME      
Dividends from subsidiaries: $ 0 $ 0 $ 0