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Financial instruments and risk management - Gains or losses associated with ten percent strengthening of US Dollar (Detail) | 12 Months Ended
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Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Disclosure of detailed information about hedging instruments [Line Items] |  |  |
Effect on net earnings | $ 193,000,000 | $ 47,000,000 | $ 42,000,000
Australian dollar |  |  |
Disclosure of detailed information about hedging instruments [Line Items] |  |  |
Closing exchange rate | 0.62 | 0.69 | 0.68
Canadian dollar |  |  |
Disclosure of detailed information about hedging instruments [Line Items] |  |  |
Closing exchange rate | 0.70 | 0.76 | 0.74
Foreign exchange risk |  |  |
Disclosure of detailed information about hedging instruments [Line Items] |  |  |
Percentage of change in annual foreign exchange rate | 10.00% |  |
Foreign exchange risk | Australian dollar |  |  |
Disclosure of detailed information about hedging instruments [Line Items] |  |  |
Closing exchange rate | 62 | 69 |
Effect on net earnings | $ 391,000,000 | $ 228,000,000 |
Impact directly on equity | $ (977,000,000) | $ (1,036,000,000) |
Foreign exchange risk | Canadian dollar |  |  |
Disclosure of detailed information about hedging instruments [Line Items] |  |  |
Closing exchange rate | 70 | 76 |
Effect on net earnings | $ (362,000,000) | $ (361,000,000) |
Impact directly on equity | $ 0 | $ 0 |

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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Classes of financial instruments [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2024-01-01 -Paragraph 52 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=21&code=ifrs-tx-2024-en-r&anchor=para_52_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 35 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_35&doctype=Standard -URIDate 2024-03-27 + Details
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