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Costs and expenses by nature - Other (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Costs and expenses by nature      
Profit sharing program $ 115 $ 89 $ 187
COVID-19 expenses 109    
Disposals of materials and inventories 25 47 32
Others 118 (14) 36
Total 752 505 445
Termination or amendment of contracts of all converted vessels 128    
Provision for litigations      
Costs and expenses by nature      
Provision 73 291 185
Asset Retirement Obligation      
Costs and expenses by nature      
Provision $ 312 $ 92 $ 5