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Performance B.6.3 Deferred tax (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning of period $ (12,000,000) $ (85,000,000)  
(Charge)/credit to income statement (3,000,000) 75,000,000  
Charge to Other Comprehensive Income (1,000,000)    
Change in scope (6,000,000) 0  
Exchange differences (12,000,000) (2,000,000)  
End of period (34,000,000) (12,000,000)  
Deferred tax assets (180,000,000) [1] (197,000,000) $ (200,000,000)
Deferred tax liabilities 214,000,000 [1] 209,000,000 285,000,000
Deductible temporary differences 5,076,000,000 4,943,000,000  
Unrecognized tax losses 4,856,000,000 4,668,000,000 4,705,000,000
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised 725,000,000    
Deferred tax assets, intragroup dividends 26,000,000 11,000,000 26,000,000
Colombia      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Negative movement in deferred tax assets 30,000,000    
Offset      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Deferred tax assets (235,000,000) (189,000,000) (52,000,000)
Deferred tax liabilities 235,000,000 189,000,000 52,000,000
Fixed assets      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning of period (142,000,000) (223,000,000)  
(Charge)/credit to income statement 23,000,000 81,000,000  
Charge to Other Comprehensive Income 0    
Change in scope (9,000,000) 0  
Exchange differences (2,000,000) 0  
End of period (130,000,000) (142,000,000)  
Deductible temporary differences 117,000,000 57,000,000  
Fixed assets | Before Offset      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Deferred tax assets (97,000,000) (97,000,000) (84,000,000)
Deferred tax liabilities 227,000,000 239,000,000 307,000,000
Unused tax losses      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning of period 187,000,000 34,000,000  
(Charge)/credit to income statement (27,000,000) 150,000,000  
Charge to Other Comprehensive Income 0    
Change in scope 0 0  
Exchange differences (4,000,000) 3,000,000  
End of period 156,000,000 187,000,000  
Deductible temporary differences 4,856,000,000 4,668,000,000  
Unused tax losses | Before Offset      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Deferred tax assets (156,000,000) (187,000,000) (34,000,000)
Deferred tax liabilities 0 0 0
Unremitted earnings      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning of period (11,000,000) (25,000,000)  
(Charge)/credit to income statement (15,000,000) 15,000,000  
Charge to Other Comprehensive Income 0    
Change in scope 0 0  
Exchange differences 0 (1,000,000)  
End of period (26,000,000) (11,000,000)  
Deferred tax liabilities 0 621,000,000 697,000,000
Unremitted earnings | Before Offset      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Deferred tax assets 0 0 0
Deferred tax liabilities 26,000,000 11,000,000 25,000,000
Other      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning of period (46,000,000) 129,000,000  
(Charge)/credit to income statement 16,000,000 (171,000,000)  
Charge to Other Comprehensive Income (1,000,000)    
Change in scope 3,000,000 0  
Exchange differences (6,000,000) (4,000,000)  
End of period (34,000,000) (46,000,000)  
Deductible temporary differences 103,000,000 218,000,000  
Other | Before Offset      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Deferred tax assets (162,000,000) (102,000,000) (134,000,000)
Deferred tax liabilities 196,000,000 148,000,000 5,000,000
Less than 1 year      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 1,000,000 3,000,000 1,000,000
1 to 5 years      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 2,000,000 3,000,000 2,000,000
After five years      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 1,232,000,000 1,089,000,000 493,000,000
No expiry      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses $ 3,621,000,000 $ 3,573,000,000 $ 4,209,000,000
[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.