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Pensions - assets, portfolio weighting (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of financial assets [line items] |  |
Pension assets on investment classes, percentage | 100.00% | 100.00%
Low range value [member] |  |
Disclosure of financial assets [line items] |  |
Company contributions | $ 130 |
High range value [member] |  |
Disclosure of financial assets [line items] |  |
Company contributions | $ 150 |
Equity securities [member] |  |
Disclosure of financial assets [line items] |  |
Pension assets on investment classes, percentage | 34.10% | 32.30%
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 | 81.00% | 92.00%
Equity securities [member] | Level 2 [member] |  |
Disclosure of financial assets [line items] |  |
Percentange of pension assets measured at fair value | 17.00% | 8.00%
Bonds [Member] |  |
Disclosure of financial assets [line items] |  |
Pension assets on investment classes, percentage | 50.20% | 46.40%
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 | 2.00% | 6.00%
Bonds [Member] | Level 2 [member] |  |
Disclosure of financial assets [line items] |  |
Percentange of pension assets measured at fair value | 98.00% | 94.00%
Money market instruments [Member] |  |
Disclosure of financial assets [line items] |  |
Pension assets on investment classes, percentage | 9.40% | 14.50%
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 2 [member] |  |
Disclosure of financial assets [line items] |  |
Percentange of pension assets measured at fair value | 100.00% | 100.00%
Real estate [Member] |  |
Disclosure of financial assets [line items] |  |
Pension assets on investment classes, percentage | 6.40% | 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 | (0.10%) | 0.50%

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