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EARNINGS PER COMMON SHARE COMPUTATION (Tables)
3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Schedule of Details Supporting Computation of Earnings Per Share
Detail supporting the computation of basic and diluted earnings per common share was as follows for the three months ended March 31, 2021 and 2020:
Three months ended March 31,
20212020
(dollars in millions, except per common share results; number of shares in thousands)
Net income available for common stockholders$828 $473 
Weighted average outstanding shares of common stock
    used to compute basic earnings per common share
128,931 132,135 
Dilutive effect of:
Employee stock options52 92 
Restricted stock568 584 
Shares used to compute diluted earnings per common share129,551 132,811 
Basic earnings per common share$6.42 $3.58 
Diluted earnings per common share$6.39 $3.56 
Number of antidilutive stock options and restricted stock
    excluded from computation
531 660