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Stock-Based Compensation Programs (Tables) | 12 Months Ended
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Dec. 31, 2019
Stock-Based Compensation Programs |
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​
​ | ​ | Number of | ​ | Weighted Average
​ |  | Shares |  | Exercise Price
Beginning of year | ​ | 15,175,811 | ​ | $ | 27.45
Granted | ​ | 1,624,395 | ​ | ​ | 51.42
Exercised | ​ | (4,173,273) | ​ | ​ | 21.19
Canceled/forfeited | ​ | (241,473) | ​ | ​ | 42.13
End of period | ​ | 12,385,460 | ​ | ​ | 32.41
​ | ​ | ​ | ​ | ​ | ​
Vested and exercisable, end of year | ​ | 7,957,900 | ​ | $ | 26.82
Reserved for future grants | ​ | 19,641,712 | ​ | ​ | ​
Schedule of weighted average assumptions used for estimating fair values of options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2019 Grants | ​ | 2018 Grants | ​ | 2017 Grants | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expected dividend yield | ​ | 0.79 | % | 1.03 | % | 0.89 | %
Expected stock price volatility | ​ | 20.36 | % | 21.98 | % | 19.62 | %
Risk-free interest rate | ​ | 2.59 | % | 2.47 | % | 2.00 | %
Expected life of options (in years) | ​ | 6.40 | years | 6.10 | years | 5.94 | years
Summary of restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | Average
​ |  | Shares/Units |  | Grant Price
​ | ​ | ​ | ​ | ​ | ​
Beginning of year | ​ | 2,875,294 | ​ | $ | 34.17
Granted | ​ | 543,384 | ​ | ​ | 45.88
Vested | ​ | (871,225) | ​ | ​ | 30.83
Canceled/forfeited | ​ | (108,717) | ​ | ​ | 39.68
End of year | ​ | 2,438,736 | ​ | $ | 37.73

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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