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Condensed parent company financial information - Company Provided Maturity Profile of Borrowings of the Parent Company and Borrowings of Subsidiaries Carrying Value (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 3,274 | $ 3,166
GBP300m 3.75% bonds 2025 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity date | 14 August 2025 |
Borrowings | $ 381 | 387
GBP350m 2.125% bonds 2026 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity date | 24 August 2026 |
Borrowings | $ 441 | 449
EUR500m 2.125% bonds 2027 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity date | 15 May 2027 |
Borrowings | $ 526 | 559
GBP400m 3.375% bonds 2028 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity date | 8 October 2028 |
Parent Company [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 381 | $ 555
Parent Company [Member] | 2025 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 376 |
Parent Company [Member] | 2025 [member] | GBP300m 3.75% bonds 2025 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity date | 14 August 2025 |
Borrowings | $ 376 |
Parent Company [Member] | 2026 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 439 |
Parent Company [Member] | 2026 [member] | GBP350m 2.125% bonds 2026 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity date | 24 August 2026 |
Borrowings | $ 439 |
Parent Company [Member] | 2027 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 521 |
Parent Company [Member] | 2027 [member] | EUR500m 2.125% bonds 2027 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity date | 15 May 2027 |
Borrowings | $ 521 |
Parent Company [Member] | 2028 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 502 |
Parent Company [Member] | 2028 [member] | GBP400m 3.375% bonds 2028 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity date | 8 October 2028 |
Borrowings | $ 502 |

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