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Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
EARNINGS    
Income (loss) from continuing operations $ 618 $ 145
Less: Net income (loss) attributable to noncontrolling interests 0 0
Income (loss) from continuing operations attributable to Key 618 145
Less: Dividends on Preferred Stock 27 27
Income (loss) from continuing operations attributable to Key common shareholders 591 118
Income (loss) from discontinued operations, net of taxes 4 1
Net income (loss) attributable to Key common shareholders $ 595 $ 119
WEIGHTED-AVERAGE COMMON SHARES    
Weighted-average common shares outstanding (000) (in shares) 964,878 967,446
Effect of common share options and other stock awards (in shares) 9,419 8,664
Weighted-average common shares and potential common shares outstanding (in shares) [1] 974,297 976,110
EARNINGS PER COMMON SHARE    
Income (loss) from continuing operations attributable to Key common shareholders (in usd per share) $ 0.61 $ 0.12
Income (loss) from discontinued operations, net of taxes (in usd per share) 0 0
Net income (loss) attributable to Key common shareholders (in usd per share) [2] 0.62 0.12
Income (loss) from continuing operations attributable to Key common shareholders - assuming dilution (in usd per share) 0.61 0.12
Income (loss) from discontinued operations, net of taxes - assuming dilution (in usd per share) 0 0
Net income (loss) attributable to Key common shareholders (in usd per share) [2] $ 0.61 $ 0.12
[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.