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Pensions - assets, portfolio weighting (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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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 | $ 100 |
High range value [member] |  |
Disclosure of financial assets [line items] |  |
Company contributions | $ 110 |
Equity securities [member] |  |
Disclosure of financial assets [line items] |  |
Pension assets on investment classes, percentage | 34.10% | 34.10%
Equity securities [member] | Low range value [member] |  |
Disclosure of financial assets [line items] |  |
Target porfolio weight | 29.00% |
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 | 61.00% | 81.00%
Equity securities [member] | Level 2 [member] |  |
Disclosure of financial assets [line items] |  |
Percentange of pension assets measured at fair value | 37.00% | 17.00%
Bonds [Member] |  |
Disclosure of financial assets [line items] |  |
Pension assets on investment classes, percentage | 50.20% | 50.20%
Bonds [Member] | Low range value [member] |  |
Disclosure of financial assets [line items] |  |
Target porfolio weight | 46.00% |
Bonds [Member] | High range value [member] |  |
Disclosure of financial assets [line items] |  |
Target porfolio weight | 59.00% |
Bonds [Member] | Level 1 [member] |  |
Disclosure of financial assets [line items] |  |
Percentange of pension assets measured at fair value | 3.00% | 2.00%
Bonds [Member] | Level 2 [member] |  |
Disclosure of financial assets [line items] |  |
Percentange of pension assets measured at fair value | 97.00% | 98.00%
Money market instruments [Member] |  |
Disclosure of financial assets [line items] |  |
Pension assets on investment classes, percentage | 9.10% | 9.40%
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 | 14.00% |
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 | 6.60% | 6.40%
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 | 0.00% | (0.10%)

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