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Trade receivables (Details 5) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of provision matrix [line items]    
Current trade receivables from closely monitored countries $ 1,505 $ 1,588
Current trade receivables from closely monitored countries past due more than one year 55 61
Current trade receivables from closely monitored countries past due more than one year, provisions recorded $ 27 $ 24