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Borrowings and other financial liabilities - Summary of borrowings and other financial liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of borrowings and other financial liabilities [Line Items]    
Borrowings and other financial liabilities $ 12,847 $ 15,148
Total non-current borrowings including overdrafts (as above) 12,440 14,624
Total other current financial liabilities 1,073 904
Total current borrowings including overdrafts (as above) 312 552
Total current borrowings and other financial liabilities 1,073 904
Total borrowings including overdrafts (as above) 12,752 15,176
Total borrowings and other financial liabilities 13,920 16,052
Derivative financial instruments [member]    
Disclosure of borrowings and other financial liabilities [Line Items]    
Borrowings and other financial liabilities 407 481
Total other current financial liabilities 95 50
Total other financial liabilities 502 531
Other financial liability [Member]    
Disclosure of borrowings and other financial liabilities [Line Items]    
Borrowings and other financial liabilities   43
Total other current financial liabilities 666 302
Total other financial liabilities 666 345
Total Other financial liabilities [member]    
Disclosure of borrowings and other financial liabilities [Line Items]    
Borrowings and other financial liabilities 407 524
Total other current financial liabilities 761 352
Total other financial liabilities $ 1,168 $ 876