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Costs and expenses by nature - Other (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Costs and expenses by nature      
Profit sharing program $ 126 $ 169 $ 88
COVID-19 expenses 44 109  
Disposals of materials and inventories 5 19 47
Others 6 118 1
Total 400 800 519
Provisions for litigation (note 28)      
Costs and expenses by nature      
Provision 98 73 291
Asset Retirement Obligation      
Costs and expenses by nature      
Provision $ 121 $ 312 $ 92