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Performance B.3. Segmental Information - Revenue from contracts with customers (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]
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
Latin America      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,548    
Latin America | Service revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,336    
Latin America | Cable and other fixed services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1,556    
Latin America | Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 42    
Africa      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 526    
Africa | Service revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 526    
Africa | Cable and other fixed services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 12    
Africa | Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3    
Over time | Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 2,102    
Over time | Latin America | Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1,701    
Over time | Africa | Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 401    
Point in time | Cable and other fixed services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 147    
Point in time | Telephone and equipment and other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 213    
Point in time | Latin America | Cable and other fixed services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 37    
Point in time | Latin America | Telephone and equipment and other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 212    
Point in time | Africa | Cable and other fixed services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 109    
Point in time | Africa | Telephone and equipment and other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue $ 1    
[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.