| EARNINGS PER COMMON SHARE COMPUTATION Detail supporting the computation of basic and diluted earnings per common share was as follows for the years ended December 31, 2019, 2018 and 2017: | | | | | | | | | | | | | | 2019 | | 2018 | | 2017 | | (dollars in millions, except per
common share results, number of
shares/options in thousands) | Net income available for common stockholders | $ | 2,707 |
| | $ | 1,683 |
| | $ | 2,448 |
| Weighted-average outstanding shares of common stock used to
compute basic earnings per common share | 134,055 |
| | 137,486 |
| | 144,493 |
| Dilutive effect of: | | | | | | Employee stock options | 107 |
| | 194 |
| | 172 |
| Restricted stock | 565 |
| | 723 |
| | 920 |
| Shares used to compute diluted earnings per common share | 134,727 |
| | 138,403 |
| | 145,585 |
| Basic earnings per common share | $ | 20.20 |
| | $ | 12.24 |
| | $ | 16.94 |
| Diluted earnings per common share | $ | 20.10 |
| | $ | 12.16 |
| | $ | 16.81 |
| Number of antidilutive stock options and restricted stock awards
excluded from computation | 478 |
| | 223 |
| | 539 |
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