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Post-Employment Benefits - Summary of Financial and Demographic Actuarial Assumptions (Detail)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Sweden [member]
Financial assumptions
Discount rate	2.40%	2.10%
Inflation rate	2.00%	2.00%
Salary increase rate	2.50%	2.50%
Demographic assumptions
Life expectancy after age 65 in years	23 years	23 years
US [member]
Financial assumptions
Discount rate	5.60%	5.00%
Inflation rate	2.50%	2.50%
Salary increase rate	4.00%	4.00%
Demographic assumptions
Life expectancy after age 65 in years	22 years	23 years
United Kingdom [member]
Financial assumptions
Discount rate	5.60%	4.80%
Inflation rate	3.10%	3.00%
Salary increase rate	0.00%	0.00%
Demographic assumptions
Life expectancy after age 65 in years	23 years	23 years

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Demographic assumptions [abstract].

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- Definition

Financial assumptions [abstract].

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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 [domain]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2024-01-01
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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 [domain]; Defined benefit obligation, at present value; Actuarial assumptions [domain]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 19
-IssueDate 2024-01-01
-Paragraph 144
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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 [domain]; Defined benefit obligation, at present value; Actuarial assumptions [domain]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 144
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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 [domain]]

+ References

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