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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2020
Capital Stock [Abstract] |
Schedule of Fair Value Assumptions |
Option Value and Assumptions
| 2020 |  | 2019 |  | 2018
Weighted-average fair value per share | $ | 39.34 |  |  | $ | 36.30 |  |  | $ | 28.52 |
Assumptions: |  |  |  |  |
Risk-free interest rate | 1.4 | % |  | 2.6 | % |  | 2.7 | %
Expected dividend yield | 1.0 | % |  | 1.1 | % |  | 1.2 | %
Expected stock price volatility | 18.9 | % |  | 18.3 | % |  | 16.8 | %
Expected option life (years) | 5.8 |  | 5.9 |  | 6.0
Summary of Stock Option Activity |
2020 Stock Option Activity
| Shares (in millions) |  | Weighted Average Exercise Price |  | Weighted-Average Remaining Term (in years) |  | Aggregate Intrinsic Value
Outstanding January 1 | 12.8 |  |  | $ | 113.10 |  |  |  |  |
Granted | 1.8 |  |  | 216.28 |  |  |  |  |
Exercised | (2.0) |  |  | 83.75 |  |  |  |  |
Canceled | (0.4) |  |  | 162.98 |  |  |  |  |
Outstanding December 31 | 12.2 |  |  | $ | 131.72 |  |  | 5.9 |  | $ | 1,388.1 |
Exercisable December 31 | 6.8 |  |  | $ | 99.09 |  |  | 4.4 |  | $ | 995.7 |
Options expected to vest | 4.9 |  |  | $ | 171.06 |  |  | 7.7 |  | $ | 364.3 |
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 | 0.8 |  |  | 0.2 |  |  | $ | 158.80 |  |  | $ | 152.44 |
Granted | 0.4 |  |  | 0.1 |  |  | 208.96 |  |  | 217.73 |
Vested | (0.4) |  |  | (0.1) |  |  | 149.09 |  |  | 122.41 |
Canceled or forfeited | — |  |  | — |  |  | 154.38 |  |  | 166.99 |
Nonvested on December 31 | 0.8 |  |  | 0.2 |  |  | $ | 187.72 |  |  | $ | 185.46 |

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, 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=120381028&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=120381028&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=120381028&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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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