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Financial instruments and risk management - Summary of changes in fair value of Level 3 financial assets and financial liabilities (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items] |  |
Currency translation adjustments | $ (83) | $ 32
Cash and cash equivalents | 8,495 | 9,673
Equity shares not held for trading | 279 | 181
Fair value through other comprehensive income |  |
Disclosure of detailed information about financial instruments [line items] |  |
Equity shares not held for trading | 221 | 157
Held at fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Cash and cash equivalents | 8,495 | 9,673
Level 3 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Opening balance | 147 | 131
Currency translation adjustments | (12) | (2)
Total realised gains/(losses) included in consolidated sales revenue | 0 | 12
Total realised gains/(losses) included in net operating costs | (32) | (18)
Total unrealised gains included in net operating costs | 22 | 43
Total unrealised gains/(losses) transferred into other comprehensive income through cash flow hedges | 34 | (1)
Additions to financial assets | 88 | 29
Disposals/maturity of financial instruments | (31) | (47)
Closing balance | 216 | 147
Net gains included in the income statement for assets and liabilities held at year end | 3 | 31
Level 3 | Held at fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Cash and cash equivalents | 0 | 0
Level 1 | Held at fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Cash and cash equivalents | $ 4,893 | $ 2,722

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- Definition The increase in the fair value measurement of assets resulting from purchases of those assets. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2024-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2024-03-27 + Details
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