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Financial risk management - D.1.1. Fixed and floating rate debt (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | $ 6,886 | $ 5,815
Reasonably possible change in risk variable, percent | 1.00% |
Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | $ 6,886 | 5,815
Reasonably possible change in risk variable, impact on profit before tax | 20 | 9
1 year | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 329 | 281
1–2 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 697 | 457
2–3 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 1,047 | 696
3–4 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 1,025 | 905
4–5 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 1,014 | 683
Greater than 5 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | $ 2,773 | $ 2,793
Weighted average | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings, interest rate | 6.67% | 6.22%
Weighted average | 1 year | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings, interest rate | 7.17% | 6.67%
Weighted average | 1–2 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings, interest rate | 7.49% | 6.99%
Weighted average | 2–3 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings, interest rate | 6.47% | 7.47%
Weighted average | 3–4 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings, interest rate | 7.50% | 6.39%
Weighted average | 4–5 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings, interest rate | 6.27% | 6.72%
Weighted average | Greater than 5 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings, interest rate | 6.32% | 5.56%
Fixed rate loans | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | $ 4,851 | $ 4,867
Fixed rate loans | 1 year | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 228 | 206
Fixed rate loans | 1–2 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 321 | 244
Fixed rate loans | 2–3 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 830 | 410
Fixed rate loans | 3–4 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 688 | 781
Fixed rate loans | 4–5 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 650 | 639
Fixed rate loans | Greater than 5 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 2,135 | 2,587
Variable rate loans | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 2,035 | 948
Variable rate loans | 1 year | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 100 | 75
Variable rate loans | 1–2 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 376 | 213
Variable rate loans | 2–3 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 218 | 286
Variable rate loans | 3–4 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 337 | 124
Variable rate loans | 4–5 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 365 | 44
Variable rate loans | Greater than 5 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | $ 638 | $ 206

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