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Performance B.1.1 Accounting for revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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