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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation [Abstract] |
Schedule of weighted-average fair value of options, assumptions used | The weighted-average fair value of options granted was estimated at $12.21, $10.95 and $7.39, in 2017, 2016 and 2015, respectively, per option on the date of grant based on the following assumptions:
| Year Ended December 31
| 2017 |  | 2016 |  | 2015
Dividend yield | 3.2 | % |  | 3.1 | % |  | 3.5 | %
Volatility | 15.6 | % |  | 16.0 | % |  | 13.4 | %
Risk-free interest rate | 1.8 | % |  | 1.2 | % |  | 1.5 | %
Expected life - years | 4.6 |  |  | 4.6 |  |  | 4.8 |
Schedule of total remaining unrecognized compensation costs and amortization period | Total remaining unrecognized compensation costs and amortization period are as follows:
| December 31, 2017 |  | Weighted-Average Service Years
Nonvested stock options | $ | 12 |  |  | 1.3
Restricted shares and time-vested restricted share units | 6 |  |  | 1.8
Nonvested performance-based restricted share units | 45 |  |  | 1.8
Summary of stock-based compensation | A summary of stock-based compensation is presented below:
Stock Options | Shares (in thousands) |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at January 1, 2017 | 6,793 |  |  | $ | 101.16 |  |  |  |  |
Granted | 1,605 |  |  | 132.77 |  |  |  |  |
Exercised | (1,323 | ) |  | 91.04 |  |  |  |  |
Forfeited or expired | (387 | ) |  | 119.49 |  |  |  |  |
Outstanding at December 31, 2017 | 6,688 |  |  | 109.69 |  |  | 7.61 |  | $ | 100 |
Exercisable at December 31, 2017 | 3,711 |  |  | 95.93 |  |  | 5.97 |  | $ | 94 |
Summary of nonvested restricted share units |
| Time-Vested Restricted Share Units |  | Performance-Based Restricted Share Units
Other Stock-Based Awards | Shares (in thousands) |  | Weighted- Average Grant-Date Fair Value |  | Shares (in thousands) |  | Weighted- Average Grant-Date Fair Value
Nonvested at January 1, 2017 | 111 |  |  | $ | 117.63 |  |  | 1,642 |  |  | $ | 116.53 |
Granted | 73 |  |  | 116.98 |  |  | 628 |  |  | 131.68 |
Vested | (72 | ) |  | 108.86 |  |  | (544 | ) |  | 112.16 |
Forfeited | (10 | ) |  | 119.08 |  |  | (164 | ) |  | 119.84 |
Nonvested at December 31, 2017 | 102 |  |  | 123.19 |  |  | 1,562 |  |  | 123.97 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the change in restricted stock units (RSUs). + References No definition available. + Details
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