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Other disclosures - Summary of transactions and balances with equity accounted units (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Other Disclosures [Line Items]      
Dividends from equity accounted units $ 183 $ 318  
Investments in equity accounted units 3,849   $ 3,971
Investment in equity accounted units      
Other Disclosures [Line Items]      
Purchases from equity accounted units (519) (529)  
Sales to equity accounted units 119 141  
Dividends from equity accounted units 183 318  
Net funding of equity accounted units (14) $ (12)  
Investments in equity accounted units 3,849   3,971
Loans to equity accounted units 39   39
Trade and other receivables: amounts due from equity accounted units 231   259
Trade and other payables: amounts due to equity accounted units $ (228)   $ (271)