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Suppliers and contractors (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Trade and Other Current Payables [Line Items]    
Related parties $ 127 $ 172
Total trade and other current payables 3,475 3,367
Plans in Brazil    
Trade and Other Current Payables [Line Items]    
Third parties 1,728 1,782
Foreign plan    
Trade and Other Current Payables [Line Items]    
Third parties $ 1,620 $ 1,413