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Investment in Associates and joint ventures - Summary of Investments in Associates (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of associates and joint ventures [line items] |  |  |
Profit (loss) from operating activities | $ 1,041 | $ 1,066 | $ 628
Exceptional Items [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Profit (loss) from operating activities | $ 0 | 28 | (95)
Associates [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Obligations created for special allocation of expenses |  |  | 18
Associates [member] | Exceptional Items [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Profit (loss) from operating activities |  |  | 42
Joint ventures [member] | Associates [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Profit (loss) from operating activities |  | $ 18 | $ (18)

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- Details
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