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Financial risk management and derivative financial instruments - Disclosure of Detailed Information About Hedging Instruments (Detail) £ in Millions, Euro in Millions, $ in Millions | 12 Months Ended |
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Dec. 31, 2020 USD ($) GBP (£) Euro | Dec. 31, 2019 USD ($)
Disclosure of detailed information about hedging instruments [line items] |  |
Hedging instrument- Fair value | $ | $ 7 | $ 30
Cash flow hedge of November 2018 [Member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Hedging instrument - Maturity | May 2027 |
Hedging instrument-Risk | Foreign exchange |
Hedging instrument-Type | Cash flow |
Hedging instrument-Hedged item | 500m 2.125% bonds 2027 |
Cash flow hedge of November 2018 [Member] | Fixed interest rate [member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Hedging insrumnt- Intrest rate | 3.50% |
Cash flow hedge of November 2018 [Member] | Floating interest rate [member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Hedging insrumnt- Intrest rate | 2.125% |
Cash flow hedge of November 2018 [Member] | Pay Hedging Instrument [member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Hedging instrument- Payleg | £ | 436 |
Hedging instrument- Receive leg | £ | 436 |
Cash flow hedge of November 2018 [Member] | Receive Hedging Instrument [member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Hedging instrument- Payleg | Euro | 500 |
Hedging instrument- Receive leg | Euro | 500 |
Cash flow hedge of October 2020 [Member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Hedging instrument - Maturity | October 2024 |
Hedging instrument-Risk | Foreign exchange |
Hedging instrument-Type | Cash flow |
Hedging instrument-Hedged item | 500m 1.625% bonds 2024 |
Cash flow hedge of October 2020 [Member] | Fixed interest rate [member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Hedging insrumnt- Intrest rate | 2.70% |
Cash flow hedge of October 2020 [Member] | Floating interest rate [member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Hedging insrumnt- Intrest rate | 1.625% |
Cash flow hedge of October 2020 [Member] | Pay Hedging Instrument [member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Hedging instrument- Payleg | £ | 454 |
Hedging instrument- Receive leg | £ | 454 |
Cash flow hedge of October 2020 [Member] | Receive Hedging Instrument [member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Hedging instrument- Payleg | Euro | 500 |
Hedging instrument- Receive leg | Euro | 500 |

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- Definition The average rate of a hedging instrument. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 23B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_23B_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The description of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 22 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_b&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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- Definition The description of the nature of risks being hedged. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 22 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_c&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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- Definition The description of the type of a hedge used by the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 22 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_a&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 22 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_b&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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- Definition The nominal amount of a hedging instrument. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 23B -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_23B_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 24A -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24A_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Description of Hedgeinstrument maturity + References No definition available. + Details
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- Details
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