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Related-party transactions - Summary of transactions and balances with equity accounted units (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of transactions between related parties [Line Items]      
Dividends from equity accounted units $ 817 $ 253 $ 210
Investments in equity accounted units 4,486 5,019  
Investment in equity accounted units [member]      
Disclosure of transactions between related parties [Line Items]      
Purchases from equity accounted units (993) (1,216) (1,249)
Sales to equity accounted units 210 248 307
Dividends from equity accounted units 817 253 210
Net funding of equity accounted units (3) (12) 11
Investments in equity accounted units 4,486 5,019 4,941
Loans to equity accounted units 39 39 42
Loans from equity accounted units (31) (49) (37)
Trade and other receivables: amounts due from equity accounted units (b) 299 298 315
Trade and other payables: amounts due to equity accounted units $ (175) $ (243) $ (231)