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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 967 $ 1,917 $ 2,625
Other comprehensive income (loss), net of tax:      
Net unrealized gains (losses) on securities available for sale, net of income taxes of $(222), $1,415, and $306 705 (4,492) (970)
Net unrealized gains (losses) on derivative financial instruments, net of income taxes of $(114), $382, and $122 361 (1,212) (388)
Net pension and postretirement benefit costs, net of income taxes of $0, $1, and $(11) 0 (5) 34
Total other comprehensive income (loss), net of tax 1,066 (5,709) (1,324)
Comprehensive income (loss) attributable to Key $ 2,033 $ (3,792) $ 1,301