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Financial structure and financial costs - Current financial assets and liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial structure, financial costs and financial instruments      
Current financial debt $ 6,396 $ 9,469 $ 7,836
Current portion of non-current financial debt 4,700 4,451 4,652
Current borrowings (Note 14) 11,096 13,920 12,488
Other current financial liabilities (Note 15) 245 327 171
Current financial assets (Note 14) (3,393) (4,548) (6,190)
Current borrowings and related financial assets and liabilities, net 7,948 9,699 6,469
Current deposits beyond three months      
Financial structure, financial costs and financial instruments      
Current financial assets (Note 14) (2,970) (4,413) (5,858)
Current portion of hedging instruments of debt      
Financial structure, financial costs and financial instruments      
Other current financial liabilities (Note 15) 157 212 127
Current financial assets (Note 14) (172) (41) (220)
Other financial instruments/held for trading      
Financial structure, financial costs and financial instruments      
Other current financial liabilities (Note 15) 88 115 44
Current financial assets (Note 14) $ (251) $ (94) $ (112)