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Accounting principles (Tables)
 12 Months Ended
Dec. 31, 2025
Accounting Principles [Abstract]  
Disclosure of depreciation period of property, plant and equipment Property, plant and equipment are depreciated using the straight-line method over the estimated useful life of the asset. The principal
useful lives applied are as follows:
 
 
DEPRECIATION PERIOD
Buildings
 
 
Office fixtures and fittings
                 3 years (1)
 
Equipment
 
 
Industrial materials and equipment
5 to 10 years
 
Technical facilities
5 to 10 years
 
Furniture and computer equipment:
 
 
Office equipment
5 to 10 years
 
IT equipment
                3 years
 
Furniture
       10 years
 
(1)Office fixtures and fittings estimated useful lives correspond to the Paris headquarters and Boston offices residual estimated
lease terms.