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Capital Stock and Long-term Retention Plan - Weighted-average assumptions (Details) - Long-Term Retention Plan - EquityInstruments EquityInstruments in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Assumptions: |  |  |  |  |
Dividend yield | 0.38% | 0.38% | 0.33% | 0.39% | 0.54%
Expected volatility | 24.58% | 27.60% | 26.92% | 19.07% | 24.00%
Risk-free interest rate | 7.04% | 4.83% | 4.61% | 4.68% | 4.79%
Expected average life of awards | 2 years 11 months 16 days | 3 years | 3 years | 3 years | 3 years
CPOs |  |  |  |  |
Arrangements: |  |  |  |  |
Number of CPOs or CPOs equivalent granted (in units) | 37,000 | 39,000 | 39,000 | 39,000 | 39,000
Contractual life | 3 years | 3 years | 3 years | 3 years | 3 years

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- Definition The expected average award life of the other equity instruments. + References No definition available. + Details
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- Definition The expected volatility of the share price used to calculate the fair value of the other equity instruments granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. + References No definition available. + Details
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- Definition Period from grant date that an equity-based award expires, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for other equity instruments granted is expressed, with a remaining term equal to the expected term of the award being valued (based on the award's remaining contractual life and taking into account the effects of expected early exercise). + References No definition available. + Details
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- Details
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