XML 124 R59.htm IDEA: XBRL DOCUMENT v3.22.0.1
Employee benefit obligations - Schedule of Asset Allocation by Category (Details)
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]  
Target asset allocations 100.00%
Debt Securities  
Defined Benefit Plan Disclosure [Line Items]  
Target asset allocations 30.00%
Real Estate  
Defined Benefit Plan Disclosure [Line Items]  
Target asset allocations 27.00%
Equity Securities  
Defined Benefit Plan Disclosure [Line Items]  
Target asset allocations 37.00%
Others  
Defined Benefit Plan Disclosure [Line Items]  
Target asset allocations 6.00%