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Additional disclosure items G.5. Related party balances and transactions (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Nov. 12, 2021
Nov. 14, 2019
Dec. 31, 2014
Expenses from transactions with related parties            
Other expenses $ (18,000,000) $ (57,000,000) $ (10,000,000)      
Total (221,000,000) (310,000,000) (412,000,000)      
Income and gains from transactions with related parties            
Other revenue 2,000,000 2,000,000 3,000,000      
Total 314,000,000 343,000,000 322,000,000      
LIABILITIES            
Total 87,000,000 356,000,000        
Amounts due to non-controlling interests, associates and joint ventures 0 [1] 29,000,000        
Amounts receivable 70,000,000 299,000,000        
Amounts due from non-controlling interests, associates and joint ventures 24,000,000 [1] 90,000,000        
Current receivables due from related parties 42,000,000 [1] 206,000,000        
Non-current receivables due from related parties 24,000,000 [1] 90,000,000        
Gain (loss) on disposal of equity investments (15,000,000) 25,000,000 (32,000,000)      
Guatemala joint ventures            
Disclosure of transactions between related parties [line items]            
Percentage of controlling interest acquired       45.00%    
LIABILITIES            
Repayments of non-current borrowings 193,000,000          
6.875% Senior Notes | Guatemala joint ventures            
LIABILITIES            
Borrowings face amount           $ 800,000,000
6.875% Senior Notes | Guatemala joint ventures | Fixed rate loans            
LIABILITIES            
Borrowings, interest rate           6.875%
Other related parties            
LIABILITIES            
Total 2,000,000 1,000,000        
Amounts receivable 5,000,000 5,000,000        
Kinnevik | Principal shareholder            
Disclosure of transactions between related parties [line items]            
Shareholder ownership percentage         37.00%  
LIABILITIES            
Shareholder ownership percentage         37.00%  
Miffin | Entities with joint control or significant influence over entity            
Expenses from transactions with related parties            
Purchases of goods and services (165,000,000) (216,000,000) (214,000,000)      
Income and gains from transactions with related parties            
Sale of goods and services 14,000,000 15,000,000 13,000,000      
Guatemala joint ventures | Joint ventures where entity is venturer            
LIABILITIES            
Total 0 231,000,000        
Amounts receivable 0 206,000,000        
Honduras joint ventures | Joint ventures where entity is venturer            
LIABILITIES            
Total 69,000,000 103,000,000        
Amounts receivable 62,000,000 84,000,000        
Honduras joint ventures | Joint ventures where entity is venturer | Sale Of Shares Consideration Receivable            
LIABILITIES            
Amounts due from non-controlling interests, associates and joint ventures 24,000,000          
Receivables due from related parties 53,000,000          
Cash receipts from repayment of advances and loans made to related parties 30,000,000          
Receivables due from related parties 53,000,000          
Non-current receivables due from related parties 24,000,000          
EPM | Entities with joint control or significant influence over entity            
LIABILITIES            
Total 15,000,000 20,000,000        
Amounts receivable 2,000,000 3,000,000        
EPM | Joint ventures where entity is venturer            
Expenses from transactions with related parties            
Purchases of goods and services (39,000,000) (37,000,000) (42,000,000)      
Income and gains from transactions with related parties            
Sale of goods and services 299,000,000 327,000,000 306,000,000      
Panama Non-Controlling Interest | Entities with joint control or significant influence over entity            
LIABILITIES            
Total 1,000,000 1,000,000        
Helios Towers Africa Ltd (HTA) | Joint ventures where entity is venturer            
Expenses from transactions with related parties            
Lease of towers and related services from HTA 0 0 $ (146,000,000)      
Panama            
LIABILITIES            
Amounts receivable 1,000,000 1,000,000        
Ghana            
LIABILITIES            
Amounts receivable $ 0 $ 0        
Colombia | EPM            
Disclosure of transactions between related parties [line items]            
Percentage ownership held by non-controlling interest 50.00%          
LIABILITIES            
Percentage ownership held by non-controlling interest 50.00%          
Cable Onda S.A | Cable Onda Partners            
Disclosure of transactions between related parties [line items]            
Percentage ownership held by non-controlling interest 20.00%          
LIABILITIES            
Percentage ownership held by non-controlling interest 20.00%          
Telefonica Moviles Panama | Cable Onda Partners            
Disclosure of transactions between related parties [line items]            
Percentage ownership held by non-controlling interest 20.00%          
LIABILITIES            
Percentage ownership held by non-controlling interest 20.00%          
[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.