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Additional disclosure items G.5. Related party balances and transactions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Expenses      
Other expenses $ (10) $ (10) $ (18)
Total (61) (55) (63)
Income and gains      
Other revenue 1 0 1
Total 15 12 11
LIABILITIES      
Total 170 103  
Amounts receivable 15 12  
Other related parties      
LIABILITIES      
Total $ 2 2  
Xavier Niel      
Disclosure of transactions between related parties [line items]      
Percentage of controlling interest acquired 40.40%    
Honduras joint ventures | Joint ventures where entity is venturer      
LIABILITIES      
Total $ 133 68  
Amounts receivable 12 9  
EPM | Entities with joint control or significant influence over entity      
Expenses      
Purchases of goods and services (47) (45) (45)
Income and gains      
Sale of goods and services 14 12 11
LIABILITIES      
Total 32 33  
Amounts receivable 3 2  
Atlas Group | Entities with joint control or significant influence over entity      
Expenses      
Purchases of goods and services (4) 0 0
Income and gains      
Sale of goods and services 0 0 $ 0
LIABILITIES      
Total $ 2 $ 0  
Colombia | EPM      
Disclosure of transactions between related parties [line items]      
Percentage ownership held by non-controlling interest 50.00%