| Stock Option Program | |||||||||||||||||
| The following table summarizes stock option activity for the years ended December 31: | |||||||||||||||||
| 2013 | 2012 | 2011 | |||||||||||||||
| Number of Options | Weighted Average Exercise Price | Number of Options | Weighted Average Exercise Price | Number of Options | Weighted Average Exercise Price | ||||||||||||
| Under option — | |||||||||||||||||
| January 1 | 56,565,030 | $ | 80.33 | 64,148,415 | $ | 77.28 | 70,335,044 | $ | 74.80 | ||||||||
| Granted: | |||||||||||||||||
| Annual | 6,220,810 | 101.55 | 5,770,190 | 87.91 | 5,514,500 | 89.46 | |||||||||||
| Progressive (Reload) | 140,447 | 109.83 | 110,065 | 89.65 | 237,839 | 94.02 | |||||||||||
| Other | 191 | 119.62 | 51,661 | 89.25 | 8,953 | 86.71 | |||||||||||
| Exercised | (18,825,218) | 79.25 | (13,123,617) | 68.78 | (11,625,863) | 68.47 | |||||||||||
| Canceled | (162,482) | 89.92 | (391,684) | 83.65 | (322,058) | 75.09 | |||||||||||
| December 31 | 43,938,778 | $ | 83.84 | 56,565,030 | $ | 80.33 | 64,148,415 | $ | 77.28 | ||||||||
| Options exercisable | |||||||||||||||||
| December 31 | 32,038,228 | $ | 79.58 | 45,207,143 | $ | 78.78 | 52,644,364 | $ | 76.90 | ||||||||