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Provisions, income tax liabilities and other liabilities - Fair Value of Plans Assets relating to Pension Plans and Other Post-employment Plans (Details) | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of fair value of plan assets [line items] |  |  |
Securities quoted in an active market | 84.40% | 86.90% | 94.80%
Other securities | 15.60% | 13.10% | 5.20%
Total | 100.00% | 100.00% | 100.00%
Cash and cash equivalents |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Securities quoted in an active market | 0.70% | 0.70% | 3.50%
Equity instruments |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Securities quoted in an active market | 21.70% | 25.00% | 24.80%
Bonds and similar instruments |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Securities quoted in an active market | 52.40% | 53.80% | 59.90%
Real estate |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Securities quoted in an active market | 4.00% | 4.00% | 3.40%
Derivatives |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Securities quoted in an active market | 0.10% | 0.00% | 0.00%
Commodities |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Securities quoted in an active market | 0.90% | 1.00% | 0.90%
Other |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Securities quoted in an active market | 4.60% | 2.40% | 2.30%
Hedge funds |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Other securities | 0.00% | 0.00% | 0.40%
Insurance policies |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Other securities | 15.60% | 13.10% | 4.80%

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