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Financial assets and liabilities - Derivative financial instruments (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |
Assets, fair value | $ 22 | $ 12
Liabilities, fair value | 53 | 84
Notional amount | 1,193 | 1,331
Derivative financial instruments - Non-current assets | 2 |
Derivative financial instruments - Current assets | 20 | 12
Derivative financial instruments - Non-current liabilities | 21 | 52
Derivative financial instruments - Current assets | 32 | 32
Net liability position | $ 13 | $ 21
6.000% Senior Secured Green Notes |  |
Disclosure of detailed information about financial instruments [line items] |  |
Stated interest rate | 6.00% | 6.00%
Hedges of net investment in foreign operations | 6.000% Senior Secured Green Notes |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net investment hedge | 350 | 350
Gain recognized in relation to this hedge | $ (22) | $ 11
Stated interest rate | 6.00% |
Cross currency interest rate swaps |  |
Disclosure of detailed information about financial instruments [line items] |  |
Assets, fair value | $ 3 |
Liabilities, fair value | 16 | 21
Notional amount | 300 | 300
Net liability position | 13 | 21
Commodity forward contracts |  |
Disclosure of detailed information about financial instruments [line items] |  |
Assets, fair value | 14 | 10
Liabilities, fair value | 30 | 51
Notional amount | 301 | 436
Forward foreign exchange contracts [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Assets, fair value | 5 | 2
Liabilities, fair value | 7 | 12
Notional amount | 592 | $ 595
Virtual Power Purchase Agreement [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial instruments - Non-current assets | $ 2 |
Virtual Power Purchase Agreement [Member] | Risk-free rate | Option Pricing |  |
Disclosure of detailed information about financial instruments [line items] |  |
Significant unobservable input rate | 0.021 |
Virtual Power Purchase Agreement [Member] | Volatility for shares, measurement input | Option Pricing |  |
Disclosure of detailed information about financial instruments [line items] |  |
Significant unobservable input rate | 0.310 |
Fair market value decrease (in percent) | (5.00%) |
Fair market value Increase (in percent) | 5.00% |

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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_7&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of current derivative financial assets. [Refer: Derivative financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The gains (losses) recognised in other comprehensive income on hedges of net investments in foreign operations, net of tax, before reclassification adjustments. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 91 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_91_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 9 -IssueDate 2024-01-01 -Paragraph 6.5.13 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2024-en-r&anchor=para_6.5.13_a&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24C -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24C_b_i&doctype=Standard -URIDate 2024-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24E -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24E_a&doctype=Standard -URIDate 2024-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 39 -IssueDate 2024-01-01 -Paragraph 102 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=39&code=ifrs-tx-2024-en-r&anchor=para_102_a&doctype=Standard -URIDate 2024-03-27 + Details
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