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Retirement benefits - Summary of Principal Financial Assumptions Used to Determine Benefit Obligations (Detail) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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United Kingdom [member] |  |  |
Disclosure of defined benefit plan actuarial assumptions [line items] |  |  |
Pension increases | 2.70% | 3.20% | 3.20%
Discount rate | 2.10% | 3.00% | 2.60%
Inflation rate | 2.70% | 3.20% | 3.20%
United States [member] |  |  |
Disclosure of defined benefit plan actuarial assumptions [line items] |  |  |
Discount rate | 2.90% | 3.90% | 3.30%
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 | 6.70% | 7.10% | 7.70%
United States [member] | Post 65 [member] |  |  |
Disclosure of defined benefit plan actuarial assumptions [line items] |  |  |
Healthcare cost trend rate | 7.10% | 7.60% | 8.70%
US post-retirement plan |  |  |
Disclosure of defined benefit plan actuarial assumptions [line items] |  |  |
Discount rate | 2.90% | 4.00% | 3.30%

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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 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + Details
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