Employee benefit obligations - Schedule of Asset Allocation by Category (Details) |
Dec. 31, 2021 |
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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% |