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Capital structure and financing - C.1. Share capital and other equity reserves (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 13, 2021
Share Capital, Reserves And Other Equity Interest And Financial Instruments [Abstract]        
Number of shares authorised (in shares) 133,333,200 133,333,200    
Number of shares issued and fully paid (in shares) 101,739,217 101,739,217    
Par value per share (usd per share) $ 1.50 $ 1.50   $ 1.50
Share capital $ 153 $ 153    
Share premium 476 478    
Share capital and premium 628 [1] 630    
Share capital, increase       $ 300
Number of shares authorised, increase       200,000,000
Disclosure of reserves within equity [line items]        
Other equity reserves (562)      
Share based compensation 19 [2] 24 [2] $ 30  
Issuance of shares 1 1 1 [2]  
Remeasurements of post-employment benefit obligations 1 [3] (2) 0  
Cash flow hedge reserve movement 18 [3] (1) (16)  
Currency translation movement (52) [3] (19) (4)  
Effect of restructuring in Tanzania [4]     0  
Other equity reserves (594) [1] (562)    
Legal reserve        
Disclosure of reserves within equity [line items]        
Other equity reserves 16 16 16  
Other equity reserves 16 16 16  
Equity settled transaction reserve        
Disclosure of reserves within equity [line items]        
Other equity reserves 50 52 47  
Share based compensation 18 24 29  
Issuance of shares (25) (26) (25)  
Other equity reserves 43 50 52  
Hedge reserve        
Disclosure of reserves within equity [line items]        
Other equity reserves (19) (18) (1)  
Cash flow hedge reserve movement 14 (1) (16)  
Other equity reserves (3) (19) (18)  
Currency translation reserve        
Disclosure of reserves within equity [line items]        
Other equity reserves (605) (593) (599)  
Currency translation movement (41) (12) (2)  
Effect of restructuring in Tanzania     9  
Other equity reserves (646) (605) (593)  
Pension obligation reserve        
Disclosure of reserves within equity [line items]        
Other equity reserves (4) (2) (3)  
Remeasurements of post-employment benefit obligations 1 (2) 0  
Other equity reserves (3) (4) (2)  
Other reserves        
Disclosure of reserves within equity [line items]        
Other equity reserves (562) (544) (538)  
Share based compensation [5] 18 [2] 24 [2] 29  
Issuance of shares [5] (25) (26) (25) [2]  
Remeasurements of post-employment benefit obligations 1 (2) 0  
Cash flow hedge reserve movement 14 (1) (16)  
Currency translation movement (41) (12) (2)  
Effect of restructuring in Tanzania [4],[5]     9  
Other equity reserves $ (594) $ (562) $ (544)  
[1] The assets and liabilities of Tigo Guatemala are 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.
[2] Share-based compensation – see note C.1.
[3] 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.
[4] Effect of the restructuring in Tanzania A.1.2.
[5] Other reserves – see note C.1.