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EARNINGS PER COMMON SHARE COMPUTATION (Tables)
3 Months Ended
Mar. 31, 2018
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, 2018 and 2017:
 
Three months ended March 31,
 
2018
 
2017
 
(dollars in millions, except per common share results; number of shares in thousands)
Net income available for common stockholders
$
491

 
$
1,115

Weighted average outstanding shares of common stock
used to compute basic earnings per common share
137,903

 
147,824

Dilutive effect of:
 
 
 
Employee stock options
213

 
199

Restricted stock
714

 
849

Shares used to compute diluted earnings per common share
138,830

 
148,872

Basic earnings per common share
$
3.56

 
$
7.54

Diluted earnings per common share
$
3.53

 
$
7.49

Number of antidilutive stock options and restricted stock
excluded from computation
645

 
938