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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of transactions between related parties [Line Items]      
Dividends from equity accounted units $ 800 $ 817 $ 253
Investments in equity accounted units 4,299 4,486  
Loans to equity accounted units 38 39  
Investment in equity accounted units [member]      
Disclosure of transactions between related parties [Line Items]      
Purchases from equity accounted units (1,209) (993) (1,216)
Sales to equity accounted units 493 210 248
Dividends from equity accounted units 800 817 253
Net funding of equity accounted units (9) (3) (12)
Investments in equity accounted units 4,299 4,486 5,019
Loans to equity accounted units 38 39 39
Loans from equity accounted units   (31) (49)
Trade and other receivables: amounts due from equity accounted units (b) 278 299 298
Trade and other payables: amounts due to equity accounted units $ (223) $ (175) $ (243)