XML 134 R105.htm IDEA: XBRL DOCUMENT v3.20.4
Property, plant and equipment - Useful lives of property, plant and equipment (Detail)
 12 Months Ended
Dec. 31, 2020
Bottom of range [member] | Buildings [member]  
Property, plant and equipment [Line Items]  
Useful life measured as period of time, property, plant and equipment 5 years
Bottom of range [member] | Machinery [member]  
Property, plant and equipment [Line Items]  
Useful life measured as period of time, property, plant and equipment 3 years
Bottom of range [member] | Other property, plant and equipment [member]  
Property, plant and equipment [Line Items]  
Useful life measured as period of time, property, plant and equipment 1 year
Top of range [member] | Buildings [member]  
Property, plant and equipment [Line Items]  
Useful life measured as period of time, property, plant and equipment 50 years
Top of range [member] | Machinery [member]  
Property, plant and equipment [Line Items]  
Useful life measured as period of time, property, plant and equipment 20 years
Top of range [member] | Other property, plant and equipment [member]  
Property, plant and equipment [Line Items]  
Useful life measured as period of time, property, plant and equipment 10 years