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Provisions and other non-current liabilities (Details 2) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Environmental provision, fiscal year maturity [abstract]        
Due within two years $ 128      
Due later than two years, but within five years 163      
Due later than five years, but within ten years 251      
Due after ten years 46      
Total environmental remediation liability provisions $ 588 $ 616 $ 809 $ 714