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Performance B.1. Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue $ 4,336 $ 3,946 [1] $ 3,936 [1]
Colombia      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1,532 1,661 1,739
Paraguay      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 609 679 662
Bolivia      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 639 614 555
El Salvador      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 386 405 422
Tanzania      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 382 399 384
Nicaragua      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 157 13 13
Costa Rica      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 153 155 153
Panama      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 475 17 0
Other operations      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 2 5 7
Service revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 4,130 3,734 3,737
Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 2,150 2,126 2,147
Cable and other fixed services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1,928 1,565 1,551
Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 52 43 38
Telephone and equipment and other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 206 212 199
Total revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue $ 4,336 $ 3,946 $ 3,936
[1] Re-presented for discontinued operations (shown in note A.4.) 2018 and 2017 were not restated for the application of IFRS 16, and, additionally, 2017 was not restated for the application of IFRS 15 and IFRS 9, as the Group elected the modified retrospective approach.