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Financial risk management - D.6. Capital management (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial Instruments [Abstract]      
Net financial obligations $ 5,870 $ 4,051 $ 3,164
EBITDA $ 1,530 $ 1,213  
Net financial obligations to EBITDA 384.00% 334.00%  
Finance lease liabilities   $ 353  
Equity $ 2,410 2,542 [1],[2]  
Net financial obligations and equity $ 8,280 $ 6,593  
Gearing ratio 71.00% 61.00%  
[1] Not restated for the application of IFRS 16 as the Group elected the modified retrospective approach.
[2] The consolidated statement of financial position at December 31, 2018 has been restated after finalization of the Cable Onda purchase accounting (note A.1.2.).