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Financial assets and liabilities - Carrying amounts of net borrowings (Details) € in Millions, $ in Millions | Dec. 31, 2024 USD ($) | Sep. 24, 2024 USD ($) | Sep. 24, 2024 EUR (€) | Dec. 31, 2023 USD ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total borrowings | $ 3,902 |  |  | $ 3,734
Undrawn borrowing facilities | 353 |  |  | 369
Euro |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total borrowings | 1,306 |  |  | 1,110
USD |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total borrowings | 2,555 |  |  | 2,562
GBP |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total borrowings | 27 |  |  | 40
Other |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total borrowings | $ 14 |  |  | $ 22
2.000% Senior Secured Green Notes |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Stated interest rate | 2.00% |  |  | 2.00%
2.000% Senior Secured Green Notes | Euro |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Effective interest rate | 2.27% |  |  | 2.27%
3.250% Senior Secured Green Notes |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Stated interest rate | 3.25% |  |  | 3.25%
3.250% Senior Secured Green Notes | USD |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Effective interest rate | 3.52% |  |  | 3.52%
6.000% Senior Secured Green Notes |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Stated interest rate | 6.00% |  |  | 6.00%
6.000% Senior Secured Green Notes | USD |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Effective interest rate | 6.72% |  |  | 6.72%
3.000% Senior Green Notes |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Stated interest rate | 3.00% |  |  | 3.00%
3.000% Senior Green Notes | Euro |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Effective interest rate | 3.25% |  |  | 3.25%
4.000% Senior Green Notes |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Stated interest rate | 4.00% |  |  | 4.00%
4.000% Senior Green Notes | USD |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Effective interest rate | 4.26% |  |  | 4.26%
Senior Secured Term Loan |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total borrowings |  | $ 300 | € 269 |
Senior Secured Term Loan | Euro |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Effective interest rate | 10.12% |  |  |
Lease obligations |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Effective interest rate | 6.27% |  |  | 6.47%
Beyond one year |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Undrawn borrowing facilities | $ 353 |  |  | $ 369

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