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Condensed parent company financial information - Condensed Parent Company statement of financial position (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Investments in subsidiary undertakings | $ 51 | $ 48 |  |
Deferred tax assets | 122 | 134 |  |
Total non-current assets | 2,879 | 2,684 |  |
Other receivables | 41 | 68 |  |
Total current assets | 1,869 | 2,129 |  |
Total assets | 4,748 | 4,813 |  |
LIABILITIES |  |  |  |
Loans and other borrowings | (3,274) | (3,166) |  |
Derivative financial instruments | 0 | (25) |  |
Total current liabilities | (1,928) | (2,190) |  |
Non-current payables | (78) | (75) |  |
Derivative financial instruments | (78) | 0 |  |
Total non-current liabilities | (5,128) | (4,569) |  |
Total liabilities | (7,056) | (6,759) |  |
Net assets (liabilities) | (2,308) | (1,946) |  |
EQUITY |  |  |  |
Total equity | (2,308) | (1,946) | $ (1,608) | $ (1,474)
Parent Company [member] |  |  |  |
ASSETS |  |  |  |
Investments in subsidiary undertakings | 4,077 | 4,113 |  |
Derivative financial instruments | 0 | 1 |  |
Deferred tax assets | 53 | 55 |  |
Total non-current assets | 4,130 | 4,169 |  |
Amounts due from related parties | 193 | 1,107 |  |
Other receivables | 16 | 9 |  |
Total current assets | 209 | 1,116 |  |
Total assets | 4,339 | 5,285 |  |
LIABILITIES |  |  |  |
Loans and other borrowings | (381) | (555) |  |
Amounts due to related parties | (1) | 0 |  |
Derivative financial instruments | 0 | (26) |  |
Total current liabilities | (382) | (581) |  |
Loans and other borrowings | (1,469) | (1,904) |  |
Non-current payables | (2) | 0 |  |
Derivative financial instruments | (14) | 0 |  |
Total non-current liabilities | (1,485) | (1,904) |  |
Total liabilities | (1,867) | (2,485) |  |
Net assets (liabilities) | 2,472 | 2,800 |  |
EQUITY |  |  |  |
Called up share capital | 43 | 46 |  |
Share premium account | 94 | 95 |  |
Currency translation reserve | (250) | (212) |  |
Other reserves | 759 | 707 |  |
Retained earnings | 1,826 | 2,164 |  |
Total equity | $ 2,472 | $ 2,800 |  |

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Data Type: | xbrli:monetaryItemType
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- Definition The amount received or receivable from the issuance of the entity's shares in excess of nominal value. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78_e&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | credit
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- Definition The amount of current payables due to related parties. [Refer: Total for all related parties [member]; Payables to related parties] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 78 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of receivables due from related parties. [Refer: Total for all related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 78 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Called up share capital. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Details
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