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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2017
Capital Stock [Abstract] |
Schedule of Fair Value Assumptions |
Option Value and Assumptions
| 2017 |  | 2016 |  | 2015
Weighted-average fair value per share | $ | 22.43 |  |  | $ | 17.73 |  |  | $ | 22.55 |
Assumptions: |  |  |  |  |
Risk-free interest rate | 2.0 | % |  | 1.3 | % |  | 1.8 | %
Expected dividend yield | 1.5 | % |  | 1.6 | % |  | 1.6 | %
Expected stock price volatility | 19.4 | % |  | 20.5 | % |  | 25.5 | %
Expected option life (years) | 6.0 |  |  | 6.1 |  |  | 7.3 |
Summary of Stock Option Activity |
2017 Stock Option Activity
| Shares (in millions) |  | Weighted Average Exercise Price |  | Weighted-Average Remaining Term (in years) |  | Aggregate Intrinsic Value
Outstanding January 1 | 14.9 |  |  | $ | 73.14 |  |  |  |  |
Granted | 2.9 |  |  | 122.66 |  |  |  |  |
Exercised | (2.5 | ) |  | 62.66 |  |  |  |  |
Canceled | (0.6 | ) |  | 97.87 |  |  |  |  |
Outstanding December 31 | 14.7 |  |  | $ | 83.71 |  |  | 5.4 |  | $ | 956.5 |
Exercisable December 31 | 7.5 |  |  | $ | 65.47 |  |  | 4.2 |  | $ | 666.8 |
Options expected to vest | 6.6 |  |  | $ | 101.83 |  |  | 7.9 |  | $ | 347.9 |
Summary of RSU and PSU Activity |
Restricted Stock Units (RSUs) and Performance Stock Units (PSUs) Activity
| Shares (in millions) |  | Weighted Average Grant Date Fair Value
| RSUs |  | PSUs |  | RSUs |  | PSUs
Nonvested on January 1 | 1.1 |  |  | 0.3 |  |  | $ | 90.10 |  |  | $ | 91.19 |
Granted | 0.5 |  |  | 0.1 |  |  | 117.44 |  |  | 122.41 |
Vested | (0.5 | ) |  | (0.1 | ) |  | 87.08 |  |  | 81.14 |
Canceled or forfeited | (0.1 | ) |  | — |  |  | 102.01 |  |  | 92.18 |
Nonvested on December 31 | 1.0 |  |  | 0.3 |  |  | $ | 104.85 |  |  | $ | 104.51 |

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- Definition Capital Stock [Abstract] + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&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 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&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 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://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=96867065&loc=d3e5070-113901 + Details
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