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New accounting standards
12 Months Ended
Dec. 31, 2021
Disclosure of initial application of standards or interpretations [abstract]  
New accounting standards
4.    Other standards

Annual Improvements to IFRS Standards 2018–2020
Classification of Liabilities as Current or Non-current (Amendments to IAS 1)
Reference to Conceptual Framework (Amendments to IFRS 3)
Property, Plant and Equipment: Proceeds before Intended Use (Amendments to IAS 16)
Onerous Contracts - Cost of Fulfilling a Contract (Amendments to IAS 37)
Disclosure of Accounting Policies (Amendments to IAS 1 and IFRS Practice Statement 2)
Definition of Accounting Estimates (Amendments to IAS 8)
Deferred tax related to assets and liabilities arising from a single transaction (Amendments to IAS 12).