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Post-employment benefits for associates - Additional information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [line items]      
Weighted average duration of defined benefit obligation 15 years 7 months 6 days 16 years 10 months 24 days  
Defined contribution plans charges $ 128 $ 105 $ 97
Benefit obligation [member]      
Disclosure of defined benefit plans [line items]      
Top four countries, percentage 87.00%    
Pension plans [member] | Germany | Foreign countries [member]      
Disclosure of defined benefit plans [line items]      
Maximum number of years to eliminate shortfall 10 years    
Other post-employment benefit plans [member] | Benefit obligation [member]      
Disclosure of defined benefit plans [line items]      
Associates covered, percentage 99.00%