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Retirement benefits - Summary of Principal Financial Assumptions Used to Determine Benefit Obligations (Detail) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Pension plans [member] | United Kingdom [member] |  |  |
Disclosure of defined benefit plan actuarial assumptions [line items] |  |  |
Pensions increases | 3.20% | 3.30% | 3.20%
Discount rate | 2.60% | 2.70% | 4.00%
Inflation rate | 3.20% | 3.30% | 3.20%
Pension plans [member] | United States [member] |  |  |
Disclosure of defined benefit plan actuarial assumptions [line items] |  |  |
Discount rate | 3.30% | 3.70% | 3.90%
US post-employment benefits [member] |  |  |
Disclosure of defined benefit plan actuarial assumptions [line items] |  |  |
Discount rate | 3.30% | 3.80% | 3.90%
Ultimate rate that the cost trend rate trends to | 4.50% | 4.50% | 4.50%
US post-employment benefits [member] | Pre 65 [member] |  |  |
Disclosure of defined benefit plan actuarial assumptions [line items] |  |  |
Healthcare cost trend rate | 7.70% | 7.00% | 7.50%
US post-employment benefits [member] | Post 65 [member] |  |  |
Disclosure of defined benefit plan actuarial assumptions [line items] |  |  |
Healthcare cost trend rate | 8.70% | 8.30% | 9.00%

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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 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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