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Employee benefits - Sensitivity Analysis (Details) - Defined benefit plan | 12 Months Ended
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Dec. 31, 2018
Discount rate |
Sensitivity of the balance of actuarial liabilities |
Change (as a percent) | 0.50%
Increase in liability (as a percent) | (5.67%)
Decrease in liability (as a percent) | 6.25%
Medical cost growth rate |
Sensitivity of the balance of actuarial liabilities |
Change (as a percent) | 0.50%
Increase in liability (as a percent) | 6.41%
Decrease in liability (as a percent) | (5.86%)
Mortality |
Sensitivity of the balance of actuarial liabilities |
Change (in years) | 1 year
Increase in liability (as a percent) | 0.47%
Decrease in liability (as a percent) | (2.27%)

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period, expressed as a percentage of total defined benefit obligation. + References No definition available. + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period, expressed as a percentage of total defined benefit obligation. + References No definition available. + Details
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- Definition The reasonably possible percentage of the change in the actuarial assumption used to determine the present value of defined benefit obligation. + References No definition available. + Details
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- Definition The reasonably possible change in the actuarial assumption, in years, used to determine the present value of defined benefit obligation. + References No definition available. + Details
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