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Financial instruments and risk management - Summary of financial assets by categories (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial assets [Line Items]    
Cash and cash equivalents $ 10,550 $ 8,201
Trade and other receivables 2,985 3,047
Equity shares and quoted funds 136 156
Other investments, including loans 1,152 454
Currency and commodity derivatives: designated as hedges   1
Derivatives and embedded derivatives not related to net debt not designated as hedges 168 423
Derivatives related to net debt 99 108
Loans to equity accounted units including quasi equity loans 198 202
Total financial assets 15,288 12,592
Loans and receivables [member]    
Disclosure of financial assets [Line Items]    
Cash and cash equivalents 10,550 8,201
Trade and other receivables 2,895 2,904
Other investments, including loans 15 14
Loans to equity accounted units including quasi equity loans 198 202
Total financial assets 13,658 11,321
Available for sale securities [member]    
Disclosure of financial assets [Line Items]    
Equity shares and quoted funds 136 156
Total financial assets 136 156
Held at fair value [member]    
Disclosure of financial assets [Line Items]    
Trade and other receivables 90 143
Other investments, including loans 1,125 431
Currency and commodity derivatives: designated as hedges   1
Derivatives and embedded derivatives not related to net debt not designated as hedges 168 423
Derivatives related to net debt 99 108
Total financial assets 1,482 1,106
Held to maturity assets [member]    
Disclosure of financial assets [Line Items]    
Other investments, including loans 12 9
Total financial assets $ 12 $ 9