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Retirement benefits - Summary of Principal Financial Assumptions Used to Determine Benefit Obligations (Detail) | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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United Kingdom [member] |  |  |
Disclosure of defined benefit plan actuarial assumptions [line items] |  |  |
Pension increases | 3.20% | 3.40% | 3.00%
Inflation rate | 3.20% | 3.40% | 3.00%
Discount rate | 5.00% | 1.80% | 1.40%
United States [member] |  |  |
Disclosure of defined benefit plan actuarial assumptions [line items] |  |  |
Discount rate | 4.90% | 2.40% | 1.90%
Ultimate rate that the cost trend rate trends to | 4.50% | 4.50% | 4.50%
United States [member] | Pre 65 [member] |  |  |
Disclosure of defined benefit plan actuarial assumptions [line items] |  |  |
Healthcare cost trend rate | 6.90% | 6.20% | 6.40%
United States [member] | Post 65 [member] |  |  |
Disclosure of defined benefit plan actuarial assumptions [line items] |  |  |
Healthcare cost trend rate | 7.30% | 6.50% | 6.80%
US post-retirement plan |  |  |
Disclosure of defined benefit plan actuarial assumptions [line items] |  |  |
Discount rate | 4.90% | 2.40% | 2.00%

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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 -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_144&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition 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]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_144&doctype=Standard -URIDate 2022-03-24 + Details
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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 -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_144&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition Medical cost trend rate used as 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 -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_144&doctype=Standard -URIDate 2022-03-24 + Details
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