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Borrowings and other financial liabilities - Summary of borrowings and other financial liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of borrowings and other financial liabilities [Line Items]    
Borrowings and other financial liabilities $ 15,148 $ 17,470
Total non-current borrowings including overdrafts (as above) 14,624 16,913
Total current borrowings including overdrafts (as above) 552 717
Total current borrowings and other financial liabilities 904 922
Total other financial liabilities 345 239
Total borrowings including overdrafts (as above) 15,176 17,630
Total borrowings and other financial liabilities 16,052 18,392
Derivative financial instruments [member]    
Disclosure of borrowings and other financial liabilities [Line Items]    
Borrowings and other financial liabilities 481 517
Total other current financial liabilities 50 6
Total other financial liabilities 531 523
Other financial liability [Member]    
Disclosure of borrowings and other financial liabilities [Line Items]    
Borrowings and other financial liabilities 43 40
Total other current financial liabilities 302 199
Total other financial liabilities 345 239
Total Other financial liabilities [member]    
Disclosure of borrowings and other financial liabilities [Line Items]    
Borrowings and other financial liabilities 524 557
Total other current financial liabilities 352 205
Total other financial liabilities $ 876 $ 762