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Provision for post-employment benefits - Weighted Average Assumptions Used For Actuarial Valuations (Detail) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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United Kingdom [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Discount rate | 2.00% | 2.80% | 2.40% | 2.50%
Rate of increase in salaries |  |  |  | 3.50%
Rate of increase in pensions in payment | 4.40% | 4.30% | 4.10% | 4.10%
Inflation | 2.60% | 2.80% | 2.70% | 2.80%
North America [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Discount rate | 3.00% | 4.10% | 3.50% | 3.80%
Rate of increase in salaries | 3.00% | 3.00% | 3.10% | 3.10%
Inflation |  |  | 4.00% | 4.00%
Western Continental Europe [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Discount rate | 1.20% | 2.00% | 1.90% | 1.70%
Rate of increase in salaries | 2.20% | 2.30% | 1.90% | 2.00%
Rate of increase in pensions in payment | 1.80% | 1.20% | 1.20% | 1.30%
Inflation | 1.70% | 1.70% | 1.70% | 1.70%
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member] |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |
Discount rate | 4.60% | 5.00% | 4.20% | 4.20%
Rate of increase in salaries | 6.10% | 5.80% | 5.50% | 5.90%
Inflation | 3.70% | 3.60% | 4.00% | 4.00%

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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 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 The expected rate of salary increases 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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