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Performance B.1. Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue $ 4,074 $ 4,076 [1] $ 4,043 [1]
Colombia      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1,661 1,739 1,717
Paraguay      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 679 662 623
Bolivia      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 614 555 542
El Salvador      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 405 422 425
Tanzania (excluding Zantel)      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 356 348 347
Chad      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 128 140 166
Costa Rica      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 155 153 152
Panama      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 17 0 0
Other operations      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 60 57 71
Service revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,861 3,876 3,820
Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 2,248 2,281 2,343
Cable and other fixed services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1,568 1,553 1,437
Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 46 41 39
Telephone and equipment and other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue $ 213 $ 200 $ 223
[1] Re-presented for discontinued operations (shown in note A.4.). Not restated for the application of IFRS 15 and 9, as the Group elected the modified retrospective approach for both standards.