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Post-employee benefit plans - Significant assumptions (Details) - year | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Post-employment benefit obligations |  |
Discount rate | 3.60% | 4.00%
Rate of compensation increase | 2.25% | 2.25%
Cost of living indexation rate | 1.60% | 1.60%
Life expectancy at age 65 (years) | 23.2 | 23.1
Net post-employment benefit plans cost |  |
Discount rate | 4.20% | 4.30%
Rate of compensation increase | 2.25% | 2.50%
Life expectancy at age 65 (years) | 23.1 | 23.0
Weighted average duration of defined benefit obligation | 15 |
Cost of medication |  |
Net post-employment benefit plans cost |  |
Actuarial assumption of medical cost trend rates | 8.00% |
Ultimate actuarial assumption of medical cost trend rates | 4.50% |
Term to reach ultimate actuarial assumption of medical cost trend rate | 20 years |
Cost of covered dental benefits |  |
Net post-employment benefit plans cost |  |
Actuarial assumption of medical cost trend rates | 4.00% |
Cost of covered hospital benefits |  |
Net post-employment benefit plans cost |  |
Actuarial assumption of medical cost trend rates | 3.30% |
Cost of other covered healthcare benefits |  |
Net post-employment benefit plans cost |  |
Actuarial assumption of medical cost trend rates | 3.00% |
DB pension |  |
Net post-employment benefit plans cost |  |
Cost of living indexation rate | 1.60% | 1.60%

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- Definition Actuarial Assumption Of Expected Rates Of Inflation, Used To Calculate Post-Employment Benefit Expense + References No definition available. + Details
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- Definition Actuarial Assumption Of Life Expectancy After Retirement, Used To Calculate Post-Employment Benefit Expense + References No definition available. + Details
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- Definition Actuarial Assumption To Measure Post-Employment Benefit Obligations [Abstract] + References No definition available. + Details
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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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