Financial Liabilities - Borrowings - Summary of Carrying Amounts and Market Value of Borrowings (Detail) - GBP (£) £ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about borrowings [line items]
Non-current borrowings	£ 1,094	£ 1,144
Borrowings	1,161	1,230
Carrying value [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	614	625
Market value [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	582	577
1.375% Euro notes 2025 [member]
Disclosure of detailed information about borrowings [line items]
Non-current borrowings	£ 257	£ 257
Effective interest rate	1.44%	1.44%
1.375% Euro notes 2025 [member] \| Carrying value [member]
Disclosure of detailed information about borrowings [line items]
Non-current borrowings	£ 257	£ 257
1.375% Euro notes 2025 [member] \| Market value [member]
Disclosure of detailed information about borrowings [line items]
Non-current borrowings	252	252
3.75% gbp notes 2030 [member]
Disclosure of detailed information about borrowings [line items]
Non-current borrowings	£ 354	£ 353
Effective interest rate	3.93%	3.93%
3.75% gbp notes 2030 [member] \| Carrying value [member]
Disclosure of detailed information about borrowings [line items]
Non-current borrowings	£ 354	£ 353
3.75% gbp notes 2030 [member] \| Market value [member]
Disclosure of detailed information about borrowings [line items]
Non-current borrowings	327	310
Overdrafts [member] \| Carrying value [member]
Disclosure of detailed information about borrowings [line items]
Non-current borrowings	3	15
Overdrafts [member] \| Market value [member]
Disclosure of detailed information about borrowings [line items]
Non-current borrowings	£ 3	£ 15

The amount of outstanding funds that the entity is obligated to repay.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard
-URIDate 2023-03-23

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The non-current portion of non-current borrowings. [Refer: Borrowings]

+ References

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- Definition

Borrowings, effective interest rate.

+ References

No definition available.

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