The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_144&doctype=Standard
-URIDate 2023-03-23

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The mortality rate used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

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The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 141
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-URIDate 2023-03-23

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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.

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The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Actuarial assumption of long-term improvement on Continuous Mortality Investigation model.

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Allocated percentage of fund to matching assets.

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Allocated percentage of fund to return seeking assets.

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Number of members under defined benefit and contribution plans.

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Percentage of pensioner liabilities matched with buy in policies.

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The weighted average duration of a defined benefit obligation.

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Retirement Benefit and Other Post-retirement Obligations - Additional Information (Detail) £ in Millions	12 Months Ended
	Dec. 31, 2024 GBP (£)	Dec. 31, 2023 GBP (£) Member	Dec. 31, 2019	Dec. 31, 2017	Dec. 31, 2022	Dec. 31, 2021
Disclosure of defined benefit plans [line items]
Percentage of long-term rate improvement on CMI model		1.50%
UK [member]
Disclosure of defined benefit plans [line items]
Weighted average duration of defined benefit obligation		12 years
US [member]
Disclosure of defined benefit plans [line items]
Weighted average duration of defined benefit obligation		6 years
CPI rate [member]
Disclosure of defined benefit plans [line items]
Inflation rate		2.30%			2.70%
UK Group plan [member]
Disclosure of defined benefit plans [line items]
Number of members under plan \| Member		26,300
Inflation rate		3.00%			3.40%	3.30%
Funding surplus from actuarial valuation		£ 160
Allocated percentage of fund to matching assets		95.00%
Allocated percentage of fund to return seeking assets		5.00%
Expected contributions in 2023	£ 0
Actuarial assumption of mortality rates					40
Aviva and legal and general [member] \| Buy-in policies [member] \| UK Group plan [member]
Disclosure of defined benefit plans [line items]
Percentage of pensioner liabilities matched with buy in policies			95.00%	95.00%