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Retirement benefit obligations - Assumptions Used for RIPS (Details) - UK RIPS - Weighted average	Feb. 24, 2022	Dec. 31, 2021
Disclosure of defined benefit plans
Discount rate (as a percent)	2.60%	2.00%
Future pension increases (as a percent)	3.60%	3.30%
RPI inflation (as a percent)	3.70%	3.40%
CPI inflation (as a percent)	3.00%	2.70%

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2023-01-01
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-URIDate 2023-03-23

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- Definition

The expected rate of increases in pension 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]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2023-01-01
-Paragraph 144
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-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.

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- Definition

The expected rate of Consumer Price Index inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation.

+ References

No definition available.

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- Definition

The expected rate of Retail Price Index inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation.

+ References

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