| Activity in stock option plans |
The tables below summarize the employee share-based activity in the Plan:
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Options |
|
Weighted-average
Exercise Price
|
|
Weighted-average
Remaining
Contractual Life
(in years)
|
|
Aggregate
Intrinsic Value
(in millions)
|
Balance at December 31, 2015 |
|
2,029,686 |
|
|
$ |
115.02 |
|
|
|
|
|
|
Granted |
|
984,430 |
|
|
109.24 |
|
|
|
|
|
|
Exercised |
|
(215,890 |
) |
|
87.27 |
|
|
|
|
|
|
Forfeited |
|
(63,462 |
) |
|
119.56 |
|
|
|
|
|
|
Balance at December 31, 2016 |
|
2,734,764 |
|
|
115.02 |
|
|
|
|
|
|
Granted |
|
648,900 |
|
|
149.98 |
|
|
|
|
|
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Exercised |
|
(355,479 |
) |
|
105.91 |
|
|
|
|
|
|
Forfeited |
|
(126,816 |
) |
|
125.65 |
|
|
|
|
|
|
Balance at December 31, 2017 |
|
2,901,369 |
|
|
123.49 |
|
|
|
|
|
|
Granted |
|
515,320 |
|
|
159.06 |
|
|
|
|
|
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Exercised |
|
(140,133 |
) |
|
88.74 |
|
|
|
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|
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Forfeited |
|
(32,894 |
) |
|
133.00 |
|
|
|
|
|
|
Balance at December 31, 2018 |
|
3,243,662 |
|
|
$ |
130.55 |
|
|
6.7 |
|
$ |
37 |
|
|
|
|
|
|
|
|
|
|
Exercisable, December 31, 2016 |
|
1,149,549 |
|
|
$ |
104.19 |
|
|
4.8 |
|
$ |
38 |
|
Exercisable, December 31, 2017 |
|
1,063,889 |
|
|
$ |
115.26 |
|
|
4.7 |
|
$ |
66 |
|
Exercisable, December 31, 2018 |
|
1,366,722 |
|
|
$ |
124.97 |
|
|
4.7 |
|
$ |
18 |
|
|
| Weighted-average grant date fair value of performance and restricted shares |
The weighted-average grant date fair value of performance and restricted shares was as follows:
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|
Performance Shares |
|
Restricted Shares |
Nonvested |
|
Shares |
|
Weighted-average
Fair Value |
|
Shares |
|
Weighted-average
Fair Value |
Balance at December 31, 2015 |
|
420,369 |
|
|
$ |
123.88 |
|
|
4,254 |
|
|
$ |
111.40 |
|
Granted |
|
169,150 |
|
|
98.26 |
|
|
8,089 |
|
|
117.69 |
|
Vested |
|
(115,680 |
) |
|
106.55 |
|
|
(2,502 |
) |
|
114.57 |
|
Forfeited |
|
(69,345 |
) |
|
110.52 |
|
|
— |
|
|
— |
|
Balance at December 31, 2016 |
|
404,494 |
|
|
120.41 |
|
|
9,841 |
|
|
115.76 |
|
Granted |
|
150,225 |
|
|
138.23 |
|
|
— |
|
|
— |
|
Vested |
|
(85,020 |
) |
|
141.50 |
|
|
(1,752 |
) |
|
106.89 |
|
Forfeited |
|
(58,460 |
) |
|
132.52 |
|
|
— |
|
|
— |
|
Balance at December 31, 2017 |
|
411,239 |
|
|
120.84 |
|
|
8,089 |
|
|
117.68 |
|
Granted |
|
124,700 |
|
|
146.50 |
|
|
— |
|
|
— |
|
Vested |
|
(80,996 |
) |
|
128.47 |
|
|
(2,696 |
) |
|
117.68 |
|
Forfeited |
|
(44,593 |
) |
|
127.90 |
|
|
— |
|
|
— |
|
Balance at December 31, 2018 |
|
410,350 |
|
|
$ |
126.36 |
|
|
5,393 |
|
|
$ |
117.68 |
|
|