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Financial risk management - D.6. Capital management (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial Instruments [Abstract]      
Net financial obligations $ 5,837 $ 5,902 $ 4,596
EBITDA $ 1,495 $ 1,530  
Net financial obligations to EBITDA 390.00% 386.00%  
Equity attributable to Owners of the Company $ 2,059 $ 2,410 [1]  
Net financial obligations and equity $ 7,896 $ 8,312  
Gearing ratio 74.00% 71.00%  
[1] The consolidated statement of financial position at December 31, 2019 has been restated after finalization of the purchase accounting of our acquisitions in Nicaragua and Panama (note A.1.2.).