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Related-party transactions (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of transactions between related parties [Line Items]      
Dividends from equity accounted units $ 610 $ 879 $ 1,431
Investments in equity accounted units 4,407 3,298 [1]  
Investment in equity accounted units      
Disclosure of transactions between related parties [Line Items]      
Purchases from equity accounted units (1,163) (1,429) (1,167)
Sales to equity accounted units 349 563 432
Dividends from equity accounted units 610 879 1,431
Net (funding of)/receipts from equity accounted units (144) (75) 6
Investments in equity accounted units 4,407 3,298 3,504
Loans related to equity accounted units 100 0 0
Trade and other receivables: amounts due from equity accounted units 189 297 251
Trade and other payables: amounts due to equity accounted units $ (206) $ (294) $ (253)
[1] Comparative information has been restated to reflect the adoption of narrow-scope amendments to IAS 12. Refer to page 166 for details.