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Long-term assets - E.1.1. Accounting for intangible assets (Details)
 12 Months Ended
Dec. 31, 2025
Disclosure of detailed information about intangible assets [line items]  
Period for which item is expensed (less than) 1 year
Trademarks | Bottom of range  
Disclosure of detailed information about intangible assets [line items]  
Intangible assets useful lives 1 year
Trademarks | Top of range  
Disclosure of detailed information about intangible assets [line items]  
Intangible assets useful lives 15 years
Customer lists | Bottom of range  
Disclosure of detailed information about intangible assets [line items]  
Intangible assets useful lives 4 years
Customer lists | Top of range  
Disclosure of detailed information about intangible assets [line items]  
Intangible assets useful lives 20 years