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v3.20.1

Pensions - assets, portfolio weighting (Details) | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of financial assets [line items] |  |
Pension assets on investment classes, percentage | 100.00% | 100.00%
Equity securities [member] |  |
Disclosure of financial assets [line items] |  |
Pension assets on investment classes, percentage | 32.30% | 36.50%
Equity securities [member] | Low range value [member] |  |
Disclosure of financial assets [line items] |  |
Target porfolio weight | 27.00% |
Equity securities [member] | High range value [member] |  |
Disclosure of financial assets [line items] |  |
Target porfolio weight | 38.00% |
Equity securities [member] | Level 1 [member] |  |
Disclosure of financial assets [line items] |  |
Percentange of pension assets measured at fair value | 92.00% | 92.00%
Equity securities [member] | Level 2 [member] |  |
Disclosure of financial assets [line items] |  |
Percentange of pension assets measured at fair value | 8.00% | 8.00%
Bonds [Member] |  |
Disclosure of financial assets [line items] |  |
Pension assets on investment classes, percentage | 46.40% | 44.90%
Bonds [Member] | Low range value [member] |  |
Disclosure of financial assets [line items] |  |
Target porfolio weight | 40.00% |
Bonds [Member] | High range value [member] |  |
Disclosure of financial assets [line items] |  |
Target porfolio weight | 53.00% |
Bonds [Member] | Level 1 [member] |  |
Disclosure of financial assets [line items] |  |
Percentange of pension assets measured at fair value | 6.00% | 31.00%
Bonds [Member] | Level 2 [member] |  |
Disclosure of financial assets [line items] |  |
Percentange of pension assets measured at fair value | 94.00% | 69.00%
Money market instruments [Member] |  |
Disclosure of financial assets [line items] |  |
Pension assets on investment classes, percentage | 14.50% | 12.30%
Money market instruments [Member] | Low range value [member] |  |
Disclosure of financial assets [line items] |  |
Target porfolio weight | 0.00% |
Money market instruments [Member] | High range value [member] |  |
Disclosure of financial assets [line items] |  |
Target porfolio weight | 29.00% |
Money market instruments [Member] | Level 1 [member] |  |
Disclosure of financial assets [line items] |  |
Percentange of pension assets measured at fair value |  | 55.00%
Money market instruments [Member] | Level 2 [member] |  |
Disclosure of financial assets [line items] |  |
Percentange of pension assets measured at fair value | 100.00% | 45.00%
Real estate [Member] |  |
Disclosure of financial assets [line items] |  |
Pension assets on investment classes, percentage | 6.30% | 6.30%
Real estate [Member] | Low range value [member] |  |
Disclosure of financial assets [line items] |  |
Target porfolio weight | 5.00% |
Real estate [Member] | High range value [member] |  |
Disclosure of financial assets [line items] |  |
Target porfolio weight | 10.00% |
Other assets [Member] |  |
Disclosure of financial assets [line items] |  |
Pension assets on investment classes, percentage | 0.50% | 0.00%

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