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Financial risk management and derivative financial instruments - Additional Information (Detail) € in Millions, £ in Millions, Euro in Millions, $ in Millions |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 | Dec. 31, 2019 GBP (£) | Dec. 31, 2019 Euro
Disclosure of financial risk management [line items] |  |  |  |  |  |  |  |  |  |
Change in value of hedged item used as basis for recognising hedge ineffectiveness |  | $ 1 | $ 2 |  |  |  |  |  |  |
Exchange element of currency swaps |  | 13 | (15) |  |  |  |  |  |  |
Minimum liquidity covenant value |  | 400 |  |  | $ 400 | $ 400 |  |  |  |
Interest expense on borrowings |  | 102 | 78 | $ 61 |  |  |  |  |  |
Currency swaps [member] |  |  |  |  |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |  |  |  |  |
Other fair value elements of currency swaps |  | 30 | 5 |  |  |  |  |  |  |
Exchange element of currency swaps |  | 13 | 15 |  |  |  |  |  |  |
Currency swaps [member] | Carrying Amounts [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on carrying amount |  | (17) | (20) |  |  |  |  |  |  |
Senior Unsecured Long-term Credit [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |  |  |  |  |
Interest expense on borrowings |  | $ 36 |  |  |  |  |  |  |  |
EUR500m 2.125% bonds 2027 [member] |  |  |  |  |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |  |  |  |  |
Swaps held by Group | € |  |  |  |  |  |  | € 500 |  |  |
Currency swaps transaction percentage |  | 2.125% |  |  |  |  | 2.125% | 2.125% |  |
Syndicated and Bilateral Facilities [Member] | Maximum [member] |  |  |  |  |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis | 2.75 |  |  |  |  |  |  |  |  |
Syndicated and Bilateral Facilities [Member] | Minimum [member] |  |  |  |  |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis | 0.90 |  |  |  |  |  |  |  |  |
EUR500m 1.625% bonds 2024 [member] |  |  |  |  |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |  |  |  |  |
Swaps held by Group | € |  |  |  |  |  |  | € 500 |  |  |
Currency swaps transaction percentage |  | 1.625% |  |  |  |  | 1.625% | 1.625% |  |
Currency risk [member] | Net investment hedges [member] | Forward contract [member] |  |  |  |  |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |  |  |  |  |
Currency swaps borrowings |  |  |  |  |  |  |  |  | 100 | 100
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 over the next 12 months |  |  |  |  |  |  |  |
Fixed Interest rate borrowings |  | 100.00% |  |  |  |  | 100.00% | 94.00% |  |
Liquidity risk [member] |  |  |  |  |  |  |  |  |  |
Disclosure of financial risk management [line items] |  |  |  |  |  |  |  |  |  |
Funds held in foreign countries where repatriation is restricted |  | $ 44 | $ 16 |  |  |  |  |  |  |
Number of financial covenants |  | two |  |  |  |  |  |  |  |

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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24B_a_iv&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24B_b_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Exchange element of currency swaps. + References No definition available. + Details
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