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EARNINGS PER COMMON SHARE COMPUTATION (Tables)
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Schedule of Computation of Basic and Diluted Earnings Per Common Share
Detail supporting the computation of basic and diluted earnings per common share was as follows for the years ended December 31, 2021, 2020 and 2019:
202120202019
 (dollars in millions, except per
common share results, number of
shares/options in thousands)
Net income available for common stockholders$2,933 $3,367 $2,707 
Weighted-average outstanding shares of common stock used to
    compute basic earnings per common share		128,688 132,199 134,055 
Dilutive effect of:
Employee stock options64 92 107 
Restricted stock644 721 565 
Shares used to compute diluted earnings per common share129,396 133,012 134,727 
Basic earnings per common share$22.79 $25.47 $20.20 
Diluted earnings per common share$22.67 $25.31 $20.10 
Number of antidilutive stock options and restricted stock awards
    excluded from computation		216 238 478