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Basis for preparation of the financial statements - IFRS 9 Financial Instrument (Details)
$ in Millions
Jan. 01, 2018
USD ($)
Suppliers and contractors | Amortized cost  
Financial instruments  
Financial liabilities, carrying amount immediately before initial application of IFRS 9 $ 4,041
Financial liabilities, carrying amount immediately after initial application of IFRS 9 4,041
Derivative financial instruments | FVTPL  
Financial instruments  
Financial liabilities, carrying amount immediately before initial application of IFRS 9 104
Financial liabilities, carrying amount immediately after initial application of IFRS 9 104
Loans and borrowings | Amortized cost  
Financial instruments  
Financial liabilities, carrying amount immediately before initial application of IFRS 9 1,703
Financial liabilities, carrying amount immediately after initial application of IFRS 9 1,703
Related parties | Amortized cost  
Financial instruments  
Financial liabilities, carrying amount immediately before initial application of IFRS 9 882
Financial liabilities, carrying amount immediately after initial application of IFRS 9 882
Derivative financial instruments | FVTPL  
Financial instruments  
Financial liabilities, carrying amount immediately before initial application of IFRS 9 686
Financial liabilities, carrying amount immediately after initial application of IFRS 9 686
Loans and borrowings | Amortized cost  
Financial instruments  
Financial liabilities, carrying amount immediately before initial application of IFRS 9 20,786
Financial liabilities, carrying amount immediately after initial application of IFRS 9 20,786
Related parties | Amortized cost  
Financial instruments  
Financial liabilities, carrying amount immediately before initial application of IFRS 9 975
Financial liabilities, carrying amount immediately after initial application of IFRS 9 975
Participative stockholders' debentures | Amortized cost  
Financial instruments  
Financial liabilities, carrying amount immediately before initial application of IFRS 9 1,233
Financial liabilities, carrying amount immediately after initial application of IFRS 9 1,233
Financial investments | FVTPL  
Financial instruments  
Financial assets, carrying amount immediately before initial application of IFRS 9 18
Financial assets, carrying amount immediately after initial application of IFRS 9 18
Derivative financial instruments | FVTPL  
Financial instruments  
Financial assets, carrying amount immediately before initial application of IFRS 9 106
Financial assets, carrying amount immediately after initial application of IFRS 9 106
Accounts receivable | Amortized cost  
Financial instruments  
Financial assets, carrying amount immediately before initial application of IFRS 9 2,600
Financial assets, carrying amount immediately after initial application of IFRS 9 2,600
Related parties | Amortized cost  
Financial instruments  
Financial assets, carrying amount immediately before initial application of IFRS 9 1,898
Financial assets, carrying amount immediately after initial application of IFRS 9 1,898
Derivative financial instruments | FVTPL  
Financial instruments  
Financial assets, carrying amount immediately before initial application of IFRS 9 453
Financial assets, carrying amount immediately after initial application of IFRS 9 453
Loans | Amortized cost  
Financial instruments  
Financial assets, carrying amount immediately before initial application of IFRS 9 151
Financial assets, carrying amount immediately after initial application of IFRS 9 151
Related parties | Amortized cost  
Financial instruments  
Financial assets, carrying amount immediately before initial application of IFRS 9 2,628
Financial assets, carrying amount immediately after initial application of IFRS 9 $ 2,628