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Financial instruments and risk management - Maturity analysis for non-derivative financial liabilities and derivative financial liabilities (Parenthetical) (Detail) - Increase (decrease) due to corrections of prior period errors [member]
$ in Millions
Dec. 31, 2016
USD ($)
Due within 1 year [member]  
Disclosure Of Maturity Analysis For Derivative Financial Liabilities [Line Items]  
Trade and other payables $ (111)
Between 1 and 2 years [member]  
Disclosure Of Maturity Analysis For Derivative Financial Liabilities [Line Items]  
Trade and other payables $ (66)