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Risk management and management of capital - Foreign currency exposures explanatory (Details) - Currency risk - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Reasonably possible change in risk variable, percent | 10.00% |  |
Net average currency exposure | $ 58 | $ 63 | $ 72
Effect of 10% change | (6) | (6) | (7)
EUR |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Net average currency exposure | 11 | 18 | 29
Effect of 10% change | (1) | (2) | (3)
USD |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Net average currency exposure | 22 | 14 | 11
Effect of 10% change | (2) | (1) | (1)
GBP |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Net average currency exposure | 13 | 10 | 4
Effect of 10% change | (1) | (1) | 0
Other |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Net average currency exposure | 12 | 22 | 28
Effect of 10% change | $ (1) | $ (2) | $ (3)

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