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Post-retirement benefits - Summary of main assumptions rate for valuations of plans (Detail) | Dec. 31, 2019 | Dec. 31, 2018
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Canada [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Discount rate | 3.10% | 3.90%
Inflation | 1.60% | 1.60%
Rate of increase in pensions | 0.10% | 0.20%
Rate of increase in salaries | 2.80% | 2.90%
UK [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Discount rate | 2.00% | 2.80%
Inflation | 2.90% | 3.30%
Rate of increase in pensions | 2.50% | 2.90%
Rate of increase in salaries | 3.50% | 3.70%
United States of America [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Discount rate | 3.10% | 4.20%
Inflation | 2.00% | 2.00%
Rate of increase in pensions | 0.00% | 0.00%
Rate of increase in salaries | 3.50% | 3.50%
Switzerland |  |
Disclosure of defined benefit plans [Line Items] |  |
Discount rate | 0.20% | 0.70%
Inflation | 1.10% | 1.20%
Rate of increase in pensions | 0.20% | 0.00%
Rate of increase in salaries | 2.10% | 2.20%

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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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