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Related-party transactions (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of transactions between related parties [Line Items]      
Dividends from equity accounted units $ 879 $ 1,431 $ 594
Investments in equity accounted units 3,298 3,504  
Investment in equity accounted units      
Disclosure of transactions between related parties [Line Items]      
Purchases from equity accounted units (1,429) (1,167) (960)
Sales to equity accounted units 563 432 271
Dividends from equity accounted units 879 1,431 594
Net (funding of)/receipts from equity accounted units (75) 6 (43)
Investments in equity accounted units 3,298 3,504 3,764
Loans to equity accounted units 0 0 41
Trade and other receivables: amounts due from equity accounted units 297 251 251
Trade and other payables: amounts due to equity accounted units $ (294) $ (253) $ (241)