Accounting Principles - Property, plant and equipment (Details)	12 Months Ended
	Dec. 31, 2022
Buildings | Bottom of range [member]
Accounting Principles
Useful lives of property, plant and equipment	20 years
Buildings | Top Of range
Accounting Principles
Useful lives of property, plant and equipment	25 years
Fixtures and fittings
Accounting Principles
Useful lives of property, plant and equipment	10 years
Technical facilities | Bottom of range [member]
Accounting Principles
Useful lives of property, plant and equipment	6 years
Technical facilities | Top Of range
Accounting Principles
Useful lives of property, plant and equipment	10 years
Equipment and tooling | Bottom of range [member]
Accounting Principles
Useful lives of property, plant and equipment	6 years
Equipment and tooling | Top Of range
Accounting Principles
Useful lives of property, plant and equipment	10 years
General facilities, miscellaneous fixtures and fittings
Accounting Principles
Useful lives of property, plant and equipment	10 years
Office equipment
Accounting Principles
Useful lives of property, plant and equipment	5 years
IT equipment
Accounting Principles
Useful lives of property, plant and equipment	5 years
Furniture
Accounting Principles
Useful lives of property, plant and equipment	10 years