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EARNINGS PER COMMON SHARE COMPUTATION (Tables)
 12 Months Ended
Dec. 31, 2017
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 years ended December 31, 2017, 2016 and 2015:
 
2017
 
2016
 
2015
 
(dollars in millions, except per
common share results, number of
shares/options in thousands)
Net income available for common stockholders
$
2,448

 
$
614

 
$
1,276

Weighted-average outstanding shares of common stock used to
compute basic earnings per common share
144,493

 
149,375

 
149,455

Dilutive effect of:
 
 
 
 
 
Employee stock options
172

 
219

 
192

Restricted stock
920

 
1,323

 
1,495

Shares used to compute diluted earnings per common share
145,585

 
150,917

 
151,142

Basic earnings per common share
$
16.94

 
$
4.11

 
$
8.54

Diluted earnings per common share
$
16.81

 
$
4.07

 
$
8.44

Number of antidilutive stock options and restricted stock awards
excluded from computation
539

 
748

 
415