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Investments in equity accounted units - Additional information (Detail) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Investments in equity accounted units [Line Items]      
Net debt of equity accounted units $ (1,576,000,000) $ 664,000,000 $ 3,651,000,000
Investment in equity accounted units      
Disclosure of Investments in equity accounted units [Line Items]      
Investments in equity accounted units with shares listed on recognised stock exchanges 0 0  
Net debt of equity accounted units $ 978,000,000 $ 931,000,000