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Provisions and other non-current liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other provisions [line items]      
Defined benefit pension plans $ 3,538 $ 3,469  
Other long-term employee benefits and deferred compensation 637 546  
Other post-employment benefits 543 612  
Environmental remediation provisions 642 592 $ 634
Product liability, government investigations, other legal matters provisions 181 200 $ 214
Contingent consideration 984 958  
Other non-current liabilities 409 255  
Total provisions and other non-current liabilities $ 6,934 $ 6,632