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Provisions and other non-current liabilities (Details 3) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Environmental provision, fiscal year maturity [abstract]        
Due within two years $ 181      
Due later than two years, but within five years 210      
Due later than five years, but within ten years 338      
Due after ten years 80      
Total environmental remediation liability provisions $ 809 $ 714 $ 692 $ 761