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Provisions and other non-current liabilities (Details 2) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Environmental provision [roll forward]      
Environmental liabilities provision at beginning of period $ 714 $ 692 $ 761
Cash payments (10) (30) (48)
Releases (27) (83) (21)
Additions 82 124 7
Currency translation effects 50 11 (7)
Environmental liabilities provision at end of period 809 714 692
Less current provision (167) (122) (58)
Non-current environmental remediation provisions at end of period $ 642 $ 592 634
Continuing operations [member]      
Environmental provision [roll forward]      
Releases     (21)
Additions     $ 7