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Share-Based Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Weighted Average Black-Scholes Assumptions | Based on the results of the model, the weighted-average grant date fair value of stock options granted for 2019, 2018, and 2017 were $27.89, $38.34 and $44.01, respectively, using the following assumptions:
Weighted Average Black-Scholes Assumptions |  | 2019 |  | 2018 |  | 2017
Risk-free interest rate |  | 2.5 | % |  | 2.6 | % |  | 1.9 | %
Expected volatility |  | 28.5 | % |  | 28.2 | % |  | 32.0 | %
Expected dividend yield |  | 3.4 | % |  | 2.6 | % |  | 2.3 | %
Expected option life, in years |  | 5 |  |  | 5 |  |  | 5 |
Summary of Stock Option Activity | The following table summarizes stock option activity during 2019:
In thousands, except per share data |  | Number of Options |  | Weighted- Average Exercise Price
Outstanding at January 1 |  | 2,291 |  |  | $ | 144.21 |
Granted |  | 256 |  |  | $ | 139.24 |
Exercised |  | (85 | ) |  | $ | 100.84 |
Canceled or expired |  | (75 | ) |  | $ | 173.22 |
Outstanding at December 31 |  | 2,387 |  |  | $ | 144.01 |
Exercisable at December 31 |  | 1,861 |  |  | $ | 140.60 |
Summary of Additional Information Related to Stock Options Outstanding | The table below summarizes additional information related to stock options outstanding at December 31, 2019:
Options in thousands / dollars in millions, except per-share data |  | Outstanding Net of Expected Forfeitures |  | Options Exercisable
Number of options |  | 2,274 |  |  | 1,861 |
Weighted-average exercise price per share |  | $ | 144.32 |  |  | $ | 140.60 |
Aggregate intrinsic value |  | $ | 42 |  |  | $ | 42 |
Weighted-average remaining contractual term, in years |  | 5 |  |  | 4 |
Summary of Stock Unity Activity | The following table summarizes stock unit activity during 2019:
Stock units in thousands, except per-share data |  | Number of Stock Units |  | Weighted- Average Grant Date Fair Value
Non-vested, at January 1 |  | 728 |  |  | $ | 150.63 |
Granted |  | 394 |  |  | $ | 127.26 |
Canceled |  | (88 | ) |  | $ | 143.58 |
Vested and transferred to unrestricted |  | (229 | ) |  | $ | 138.40 |
Non-vested, at December 31 |  | 805 |  |  | $ | 144.48 |

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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=116856206&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=116856206&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=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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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for exercisable or convertible options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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