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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
EARNINGS      
Income (loss) from continuing operations $ 964 $ 1,911 $ 2,612
Less: Net income (loss) attributable to noncontrolling interests 0 0 0
Income (loss) from continuing operations attributable to Key 964 1,911 2,612
Less: Dividends on preferred stock 143 118 106
Income (loss) from continuing operations attributable to Key common shareholders 821 1,793 2,506
Income (loss) from discontinued operations, net of taxes 3 6 13
Net income (loss) attributable to Key common shareholders $ 824 $ 1,799 $ 2,519
WEIGHTED-AVERAGE COMMON SHARES      
Weighted-average common shares outstanding (in shares) 927,217 924,363 947,065
Effect of common share options and other stock awards (in shares) 5,542 8,696 10,349
Weighted-average common shares and potential common shares outstanding (in shares) [1] 932,759 933,059 957,414
EARNINGS PER COMMON SHARE      
Income (loss) from continuing operations attributable to Key common shareholders (in dollars per share) $ 0.88 $ 1.94 $ 2.64
Income (loss) from discontinued operations, net of taxes (in dollars per share) 0 0.01 0.01
Net income (loss) attributable to Key common shareholders (in dollars per share) [2] 0.89 1.94 2.65
Income (loss) from continuing operations attributable to Key common shareholders - assuming dilution (in dollars per share) 0.88 1.92 2.62
Income (loss) from discontinued operations, net of taxes — assuming dilution (in dollars per share) 0 0.01 0.01
Net income (loss) attributable to Key common shareholders (in dollars per share) [2] $ 0.88 $ 1.93 $ 2.63
[1] Assumes conversion of Common Share options and other stock awards and/or convertible preferred stock, as applicable.
[2] EPS may not foot due to rounding.