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Performance B.1. Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Nov. 12, 2021
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue $ 4,617 [1] $ 4,171 $ 4,336  
Guatemala joint ventures        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Percentage of controlling interest acquired       45.00%
Eliminations        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue (4) (4)    
Colombia        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 1,414 1,346 1,532  
Paraguay        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 555 544 610  
Bolivia        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 623 584 639  
El Salvador        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 445 389 386  
Tanzania        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 357 366 382  
Nicaragua        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 238 220 157  
Costa Rica        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 141 140 153  
Panama        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 632 585 475  
Guatemala        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 223 0 0  
Guatemala | Guatemala joint ventures        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Percentage of controlling interest acquired       45.00%
Other operations        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 2 3 4  
Other operations | Eliminations        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue (13) (5) (3)  
Service revenue        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 4,354 3,971 4,130  
Service revenue | Eliminations        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue (4) (4)    
Mobile        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 2,347 2,116 2,150  
Cable and other fixed services        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 1,947 1,803 1,928  
Cable and other fixed services | Eliminations        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue (2) (1)    
Other        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 60 52 51  
Other | Eliminations        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue (2) (2)    
Telephone and equipment        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue 263 201 206  
Total revenue        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenue $ 4,617 $ 4,171 $ 4,336  
[1] (i)    Tigo Guatemala is fully consolidated since the acquisition of the remaining 45% shareholding on November 12, 2021. See note A.1.2. for further details. As a result, numbers might not be directly comparable with previous years' figures.