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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of transactions between related parties [Line Items]      
Dividends from equity accounted units $ 594 $ 669 $ 800
Investments in equity accounted units 3,764 3,971  
Loans to equity accounted units 41 39  
Investment in equity accounted units      
Disclosure of transactions between related parties [Line Items]      
Purchases from equity accounted units (960) (1,155) (1,209)
Sales to equity accounted units 271 268 493
Dividends from equity accounted units 594 669 800
Net funding of equity accounted units (43) (33) (9)
Investments in equity accounted units 3,764 3,971 4,299
Loans to equity accounted units 41 39 38
Trade and other receivables: amounts due from equity accounted units 251 259 278
Trade and other payables: amounts due to equity accounted units $ (241) $ (271) $ (223)