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Financial risk management and derivative financial instruments - Additional Information (Detail) € in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2024 EUR (€) | Sep. 30, 2024 EUR (€) | Nov. 30, 2023 EUR (€)
Disclosure of financial risk management [line items] |  |  |  |  |  |
Change in value of hedged item used as basis for recognising hedge ineffectiveness | $ (7) | $ 15 | $ (6) |  |  |
Funds held in foreign countries where repatriation is restricted | $ 22 | $ 56 |  |  |  |
Cash flow leverage ratio | 2.34 | 2.09 |  | 2.34 |  |
Ratio between the hedged item and the hedging instrument | 1 |  |  | 1 |  |
Currency swaps [member] |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |
Other fair value elements of currency swaps | $ (28) | $ (3) |  |  |  |
Currency swaps [member] | Carrying Amounts [Member] |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |
Gain (loss) on carrying amount | $ (102) | $ (2) |  |  |  |
EUR500m 2.125% bonds 2027 [member] |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |
Swaps held by Group | € |  |  |  | € 500 |  |
Interest rate | 2.125% |  |  | 2.125% |  |
EUR500m 1.625% bonds 2024 [member] |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |
Swaps held by Group | € |  |  |  | € 500 |  |
Interest rate | 1.625% |  |  | 1.625% |  |
EUR750m 3.625% bonds 2031 [member] |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |
Swaps held by Group | € |  |  |  |  | € 750 |
Interest rate |  |  |  |  | 3.625% |
EUR600m 4.375% bonds 2029 [member] |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |
Swaps held by Group | € |  |  |  | € 600 | € 750 | € 600
Interest rate | 4.375% |  |  | 4.375% |  | 4.375%
Revolving Credit Facilities [Member] |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |
Interest margin payable | 0.60% |  |  | 0.60% |  |
Interest rate risk [member] |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |
Interest rate on deposits | 1.00% |  |  | 1.00% |  |
Interest rate risk [member] | Fixed interest rate [member] |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |
Description of fixed Interest rate borrowings | The Group’s policy requires a minimum of 50% fixed rate debt. |  |  |  |  |
Fixed Interest rate borrowings | 100.00% | 100.00% |  | 100.00% |  |
Liquidity risk [member] |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |
Funds held in foreign countries where repatriation is restricted | $ 2 | $ 30 |  |  |  |
Number of financial covenants | two |  |  |  |  |

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