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Financial instruments and risk management - Summary of financial liabilities by categories (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial liabilities [Line Items]    
Trade and other financial payables $ (5,552) $ (5,922)
Short-term borrowings and bank overdrafts (312) (552)
Medium-term and long-term borrowings (12,440) (14,624)
IFRS 9 [member]    
Disclosure of financial liabilities [Line Items]    
Trade and other financial payables (5,552)  
Short-term borrowings and bank overdrafts (312)  
Medium-term and long-term borrowings (12,440)  
Derivatives related to net debt: designated as hedges (358)  
Derivatives and embedded derivatives not related to net debt: not designated as hedges (98)  
Embedded derivatives not related to net debt: designated as hedges (46)  
Other financial liabilities (666)  
Total financial liabilities (19,472)  
IFRS 9 [member] | Amortised Cost [member]    
Disclosure of financial liabilities [Line Items]    
Trade and other financial payables (5,513)  
Short-term borrowings and bank overdrafts (312)  
Medium-term and long-term borrowings (12,440)  
Other financial liabilities (666)  
Total financial liabilities (18,931)  
IFRS 9 [member] | Fair value through profit loss [member]    
Disclosure of financial liabilities [Line Items]    
Trade and other financial payables (39)  
Derivatives related to net debt: designated as hedges (358)  
Derivatives and embedded derivatives not related to net debt: not designated as hedges (98)  
Embedded derivatives not related to net debt: designated as hedges (46)  
Total financial liabilities $ (541)  
IAS 39 [Member]    
Disclosure of financial liabilities [Line Items]    
Trade and other financial payables   (5,922)
Short-term borrowings and bank overdrafts   (552)
Medium-term and long-term borrowings   (14,624)
Derivatives related to net debt: designated as hedges   (276)
Other derivatives and embedded derivatives: not designated as hedges   (255)
Other financial liabilities   (345)
Total financial liabilities   (21,974)
IAS 39 [Member] | Held at fair value [member]    
Disclosure of financial liabilities [Line Items]    
Trade and other financial payables   (15)
Derivatives related to net debt: designated as hedges   (276)
Other derivatives and embedded derivatives: not designated as hedges   (255)
Total financial liabilities   (546)
IAS 39 [Member] | Other financial liability held to maturity [Member]    
Disclosure of financial liabilities [Line Items]    
Trade and other financial payables   (5,907)
Short-term borrowings and bank overdrafts   (552)
Medium-term and long-term borrowings   (14,624)
Other financial liabilities   (345)
Total financial liabilities   $ (21,428)