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Performance B.3. Segmental Information - Revenue from contracts with customers (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]
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
Service revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 4,130 3,734 3,737
Telephone and equipment and other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 206 212 $ 199
Latin America      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,954 3,548  
Latin America | Service revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,748 3,336  
Africa      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 382 399  
Africa | Service revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 382 398  
Over time | Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 2,007 1,981  
Over time | Cable and other fixed services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1,928 1,565  
Over time | Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 52 43  
Over time | Latin America | Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1,747 1,701  
Over time | Latin America | Cable and other fixed services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1,919 1,556  
Over time | Latin America | Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 51 42  
Over time | Africa | Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 261 280  
Over time | Africa | Cable and other fixed services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 9 10  
Over time | Africa | Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1 1  
Point in time | Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 143 145  
Point in time | Telephone and equipment and other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 206 212  
Point in time | Latin America | Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 31 37  
Point in time | Latin America | Telephone and equipment and other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 206 212  
Point in time | Africa | Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 112 108  
Point in time | Africa | Telephone and equipment and other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue $ 0 $ 0  
[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.