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Performance B.1.1 Accounting for revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue $ 5,819 $ 5,804 $ 5,661
Service revenue      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 5,451 5,417 5,250
Mobile Services | Over time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,260 3,119 2,949
Mobile Services | Point in time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 26 39 44
Fixed and other services | Over time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 2,068 2,175 2,192
Other | Over time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 98 84 65
Telephone and equipment | Point in time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue $ 367 $ 387 $ 411