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Performance B.1.1 Accounting for revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue $ 5,804 $ 5,661 $ 5,624
Service revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 5,417 5,250 5,171
Mobile Services | Over time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,119 2,949 2,916
Mobile Services | Point in time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 39 44 40
Fixed and other services | Over time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 2,175 2,192 2,145
Other | Over time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 84 65 69
Telephone and equipment | Point in time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue $ 387 $ 411 $ 454