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Additional disclosure items G.5. Related party balances and transactions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 27, 2022
Nov. 12, 2021
Expenses          
Other expenses $ (18) $ (16) $ (57)    
Total (63) (220) (310)    
Income and gains          
Other revenue 1 2 2    
Total 11 314 343    
LIABILITIES          
Total 88 110      
Amounts receivable 15 70      
Guatemala joint ventures          
Disclosure of transactions between related parties [line items]          
Percentage of controlling interest acquired       45.00% 45.00%
Other related parties          
LIABILITIES          
Total 2 2      
Amounts receivable 0 5      
Miffin | Entities with joint control or significant influence over entity          
Expenses          
Purchases of goods and services 0 (165) (216)    
Income and gains          
Sale of goods and services 11 14 15    
Honduras joint ventures | Joint ventures where entity is venturer          
LIABILITIES          
Total 48 69      
Amounts receivable 13 62      
EPM | Entities with joint control or significant influence over entity          
LIABILITIES          
Total 39 38      
Amounts receivable 2 2      
EPM | Joint ventures where entity is venturer          
Expenses          
Purchases of goods and services (45) (39) (37)    
Income and gains          
Sale of goods and services 0 299 $ 327    
Panama Non-Controlling Interest | Entities with joint control or significant influence over entity          
LIABILITIES          
Total 0 1      
Panama          
LIABILITIES          
Amounts receivable $ 0 $ 1      
Colombia | EPM          
Disclosure of transactions between related parties [line items]          
Percentage ownership held by non-controlling interest 50.00%        
Telecomunicaciones Digitales, S.A. (formerly Cable Onda S.A.) | Cable Onda Partners          
Disclosure of transactions between related parties [line items]          
Percentage ownership held by non-controlling interest 20.00%        
Grupo de Comunicaciones Digitales, S.A. (formerly Telefonica Moviles Panama, S.A.) | Cable Onda Partners          
Disclosure of transactions between related parties [line items]          
Percentage ownership held by non-controlling interest 20.00%