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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of fair value of plan assets [line items]      
Securities quoted in an active market 84.90% 84.40% 86.90%
Other securities 15.10% 15.60% 13.10%
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 0.80% 0.70% 0.70%
Equity instruments      
Disclosure of fair value of plan assets [line items]      
Securities quoted in an active market 22.30% 21.70% 25.00%
Bonds and similar instruments      
Disclosure of fair value of plan assets [line items]      
Securities quoted in an active market 54.30% 52.40% 53.80%
Real estate      
Disclosure of fair value of plan assets [line items]      
Securities quoted in an active market 3.40% 4.00% 4.00%
Derivatives      
Disclosure of fair value of plan assets [line items]      
Securities quoted in an active market 0.00% 0.10% 0.00%
Commodities      
Disclosure of fair value of plan assets [line items]      
Securities quoted in an active market 0.90% 0.90% 1.00%
Other      
Disclosure of fair value of plan assets [line items]      
Securities quoted in an active market 3.20% 4.60% 2.40%
Hedge funds      
Disclosure of fair value of plan assets [line items]      
Other securities 0.00% 0.00% 0.00%
Insurance policies      
Disclosure of fair value of plan assets [line items]      
Other securities 15.10% 15.60% 13.10%