EARNINGS PER COMMON SHARE COMPUTATION Detail supporting the computation of basic and diluted earnings per common share was as follows for the three and nine months ended September 30, 2016 and 2015: | | | | | | | | | | | | | | | | | | Three months ended September 30, | | Nine months ended September 30, | | 2016 | | 2015 | | 2016 | | 2015 | | (dollars in millions, except per common share results; number of shares in thousands) | Net income available for common stockholders | $ | 450 |
| | $ | 314 |
| | $ | 1,015 |
| | $ | 1,175 |
| Weighted average outstanding shares of common stock
used to compute basic earnings per common share | 149,417 |
| | 148,889 |
| | 149,321 |
| | 149,617 |
| Dilutive effect of: | | | | | | | | Employee stock options | 210 |
| | 182 |
| | 216 |
| | 198 |
| Restricted stock | 1,277 |
| | 1,395 |
| | 1,332 |
| | 1,506 |
| Shares used to compute diluted earnings per common share | 150,904 |
| | 150,466 |
| | 150,869 |
| | 151,321 |
| Basic earnings per common share | $ | 3.01 |
| | $ | 2.11 |
| | $ | 6.80 |
| | $ | 7.85 |
| Diluted earnings per common share | $ | 2.98 |
| | $ | 2.09 |
| | $ | 6.73 |
| | $ | 7.77 |
| Number of antidilutive stock options and restricted stock
excluded from computation | 658 |
| | 320 |
| | 873 |
| | 451 |
|
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