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Performance B.3. Segmental Information - Revenue from contracts with customers (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue $ 4,617 [1] $ 4,171 $ 4,336
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
Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 60 52 51
Service revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 4,354 3,971 4,130
Telephone and equipment      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 263 201 206
Latin America      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 4,261 3,805 3,954
Latin America | Service revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,998 3,604 3,748
Africa      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 357 366 382
Africa | Service revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 357 366 382
Over time | Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 2,196 1,967 2,007
Over time | Cable and other fixed services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1,947 1,803 1,928
Over time | Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 60 52 52
Over time | Latin America | Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1,963 1,728 1,747
Over time | Latin America | Cable and other fixed services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1,938 1,794 1,919
Over time | Latin America | Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 60 51 51
Over time | Africa | Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 233 239 261
Over time | Africa | Cable and other fixed services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 9 8 9
Over time | Africa | Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 1 1
Point in time | Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 150 149 143
Point in time | Telephone and equipment      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 263 201 206
Point in time | Latin America | Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 37 31 31
Point in time | Latin America | Telephone and equipment      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 263 201 206
Point in time | Africa | Mobile      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 114 118 112
Point in time | Africa | Telephone and equipment      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue $ 0 $ 0 $ 0
[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.