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Post-Employment Benefits - Summary of Financial and Demographic Actuarial Assumptions (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Sweden [member] |  |
Financial assumptions |  |
Discount rate | 0.50% | 0.90%
Inflation rate | 1.80% | 1.80%
Salary increase rate | 2.80% | 2.80%
Demographic assumptions |  |
Life expectancy after age 65 in years | 23 years | 22 years
US [member] |  |
Financial assumptions |  |
Discount rate | 2.30% | 3.20%
Inflation rate | 2.50% | 2.50%
Salary increase rate | 3.50% | 3.50%
Demographic assumptions |  |
Life expectancy after age 65 in years | 23 years | 23 years
United Kingdom [member] |  |
Financial assumptions |  |
Discount rate | 1.50% | 2.10%
Inflation rate | 2.80% | 3.00%
Demographic assumptions |  |
Life expectancy after age 65 in years | 23 years | 23 years

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- Definition Demographic assumptions [abstract]. + References No definition available. + Details
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- Definition Financial assumptions [abstract]. + References No definition available. + Details
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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 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The life expectancy after retirement used as a 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 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + Details
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