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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Assumptions Used to Determine Weighted-Average Fair Value of Options Granted | The weighted average fair value of options granted in 2018, 2017 and 2016 was $8.26, $7.04 and $5.89 per option, respectively, and were determined using the following assumptions:
Years Ended December 31 | 2018 |  | 2017 |  | 2016
Expected dividend yield | 3.4 | % |  | 3.6 | % |  | 3.8 | %
Risk-free interest rate | 2.9 | % |  | 2.0 | % |  | 1.4 | %
Expected volatility | 19.1 | % |  | 17.8 | % |  | 19.6 | %
Expected life (years) | 6.1 |  |  | 6.1 |  |  | 6.2 |
Summarized Information Relative to Stock Option Plan Activity | Summarized information relative to stock option plan activity (options in thousands) is as follows:
| Number of Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding January 1, 2018 | 36,274 |  |  | $ | 46.77 |  |  |  |  |
Granted | 3,520 |  |  | 58.15 |  |  |  |  |
Exercised | (14,598 | ) |  | 40.51 |  |  |  |  |
Forfeited | (1,389 | ) |  | 53.80 |  |  |  |  |
Outstanding December 31, 2018 | 23,807 |  |  | $ | 51.89 |  |  | 5.95 |  | $ | 584 |
Exercisable December 31, 2018 | 16,184 |  |  | $ | 48.85 |  |  | 4.82 |  | $ | 446 |
Additional Information Pertaining to Stock Option Plans | Additional information pertaining to stock option plans is provided in the table below:
Years Ended December 31 | 2018 |  | 2017 |  | 2016
Total intrinsic value of stock options exercised | $ | 348 |  |  | $ | 236 |  |  | $ | 444 |
Fair value of stock options vested | 29 |  |  | 30 |  |  | 28 |
Cash received from the exercise of stock options | 591 |  |  | 499 |  |  | 939 |
Summary of Nonvested RSU and PSU Activity | A summary of nonvested RSU and PSU activity (shares in thousands) is as follows:
|  | RSUs |  | PSUs
|  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Shares |  | Weighted Average Grant Date Fair Value
Nonvested January 1, 2018 |  | 13,609 |  |  | $ | 59.32 |  |  | 1,868 |  |  | $ | 60.03 |
Granted |  | 7,270 |  |  | 58.46 |  |  | 1,081 |  |  | 57.17 |
Vested |  | (3,766 | ) |  | 59.66 |  |  | (758 | ) |  | 57.59 |
Forfeited |  | (985 | ) |  | 59.30 |  |  | (152 | ) |  | 60.06 |
Nonvested December 31, 2018 |  | 16,128 |  |  | $ | 58.85 |  |  | 2,039 |  |  | $ | 59.42 |

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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: 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=109197908&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=109197908&loc=d3e5070-113901 + Details
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