Note P.
Earnings Per Share of Common Stock
| The following table presents the computation of basic and diluted earnings per share of common stock. | ||||||||||||
| ($ in millions except per share amounts) | ||||||||||||
| For the year ended December 31: | 2013 | 2012 | 2011 | |||||||||
| Weighted-average number of shares on which earnings | ||||||||||||
| per share calculations are based | ||||||||||||
| Basic | 1,094,486,604 | 1,142,508,521 | 1,196,951,006 | |||||||||
| Add—incremental shares under stock-based | ||||||||||||
| compensation plans | 6,751,240 | 10,868,426 | 14,241,131 | |||||||||
| Add—incremental shares associated with contingently | ||||||||||||
| issuable shares | 1,804,313 | 2,072,370 | 2,575,848 | |||||||||
| Assuming dilution | 1,103,042,156 | 1,155,449,317 | 1,213,767,985 | |||||||||
| Net income on which basic earnings per share is | ||||||||||||
| calculated | $ | 16,483 | $ | 16,604 | $ | 15,855 | ||||||
| Less—net income applicable to contingently issuable | ||||||||||||
| shares | (1) | (1) | 0 | |||||||||
| Net income on which diluted earnings per share is | ||||||||||||
| calculated | $ | 16,483 | $ | 16,603 | $ | 15,855 | ||||||
| Earnings/(loss) per share of common stock | ||||||||||||
| Assuming dilution | $ | 14.94 | $ | 14.37 | $ | 13.06 | ||||||
| Basic | $ | 15.06 | $ | 14.53 | $ | 13.25 | ||||||
Weighted-average stock options to purchase 8,797 common shares in 2013 were outstanding, but were not included in the computation of diluted earnings per share because the exercise price of the options was greater than the average market price of the common shares for the full year, and therefore, the effect would have been antidilutive. There were no stock options outstanding in 2012 and 2011 that were considered antidilutive and not included in the diluted earnings per share calculation.