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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of transactions between related parties [Line Items]      
Dividends from equity accounted units $ 669 $ 800 $ 817
Investments in equity accounted units 3,971 4,299  
Loans to equity accounted units 39 38  
Investment in equity accounted units [Member]      
Disclosure of transactions between related parties [Line Items]      
Purchases from equity accounted units (1,155) (1,209) (993)
Sales to equity accounted units 268 493 210
Dividends from equity accounted units 669 800 817
Net funding of equity accounted units (33) (9) (3)
Investments in equity accounted units 3,971 4,299 4,486
Loans to equity accounted units 39 38 39
Loans from equity accounted units 0 0 (31)
Trade and other receivables: amounts due from equity accounted units 259 278 299
Trade and other payables: amounts due to equity accounted units $ (271) $ (223) $ (175)