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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of associates and joint ventures [line items] |  |  |  |  |
Profit (loss) from operating activities | $ 1,066 | $ 628 | [1] | $ 494 | [1]
Exceptional Items [member] |  |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |  |
Profit (loss) from operating activities | 28 | (95) |  | $ (29) |
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) |  |  |
[1] | Re-presented for the adoption of IFRS 17 ‘Insurance Contracts’ and to combine System Fund revenues and reimbursables (see New accounting standards and other presentational changes).

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