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Capital structure and financing - C.7.4. Call and put options (Details) - USD ($)
$ in Millions
Aug. 29, 2019
Dec. 13, 2018
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about business combination [line items]        
Add (less) derivatives related to debt (note D.1.2.)     $ 17 $ 0
Transaction Price plus interest (as a percentage) 5.00%      
Put option liability     $ 264 $ 239 [1],[2]
Cable Onda S.A        
Disclosure of detailed information about business combination [line items]        
Percentage ownership held by non-controlling interest 20.00% 20.00%    
Vesting period of put option   42 months    
Add (less) derivatives related to debt (note D.1.2.)   $ 239    
Vesting period of call option   42 months    
Threshold for ownership percentage of counterparty to make call option exercisable 10.00% 10.00%    
Enterprise value of acquired entity $ 1,460      
Interest rate on put option 5.00%      
Interest rate on call option 10.00% 10.00%    
[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.).