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Performance B.1. Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue $ 4,171 $ 4,336 $ 3,946 [1]
Eliminations      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue (4)    
Colombia      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1,346 1,532 1,661
Paraguay      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 544 610 679
Bolivia      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 584 639 614
El Salvador      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 389 386 405
Tanzania      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 366 382 399
Nicaragua      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 220 157 13
Costa Rica      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 140 153 155
Panama      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 585 475 17
Other operations      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3 4 6
Other operations | Eliminations      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue (5) (3) (2)
Service revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,971 4,130 3,734
Service revenue | Eliminations      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue (4)    
Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 2,116 2,150 2,126
Cable and other fixed services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1,803 1,928 1,565
Cable and other fixed services | Eliminations      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue (1)    
Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 52 51 43
Other | Eliminations      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue (2)    
Telephone and equipment and other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 201 206 212
Total revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue $ 4,171 $ 4,336 $ 3,946
[1] 2018 was not restated for the application of IFRS 16, as the Group elected the modified retrospective approach.