Post-Employment Benefits - Summary of Sensitivity Analysis of Significant Actuarial Assumptions (Detail) - Present value of defined benefit obligation [member] kr in Millions	Dec. 31, 2024 SEK (kr)
Discount rate [member] \| Sweden [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of decrease in DBO assumptions	kr 5.3
Impact of increase in DBO assumptions	(4.7)
Discount rate [member] \| US [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of decrease in DBO assumptions	0.2
Impact of increase in DBO assumptions	(0.2)
Discount rate [member] \| United Kingdom [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of decrease in DBO assumptions	0.7
Impact of increase in DBO assumptions	(0.6)
Actuarial assumption of expected rates of inflation [member] \| Sweden [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of decrease in DBO assumptions	(4.7)
Impact of increase in DBO assumptions	5.3
Actuarial assumption of expected rates of inflation [member] \| US [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of decrease in DBO assumptions	0.0
Impact of increase in DBO assumptions	0.0
Actuarial assumption of expected rates of inflation [member] \| United Kingdom [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of decrease in DBO assumptions	(0.5)
Impact of increase in DBO assumptions	0.5
Actuarial assumption of expected rates of salary increases [member] \| Sweden [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of decrease in DBO assumptions	(1.4)
Impact of increase in DBO assumptions	1.5
Actuarial assumption of expected rates of salary increases [member] \| US [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of decrease in DBO assumptions	0.0
Impact of increase in DBO assumptions	0.0
Actuarial assumption of expected rates of salary increases [member] \| United Kingdom [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of decrease in DBO assumptions	0.0
Impact of increase in DBO assumptions	0.0
Longevity [member] \| Sweden [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of decrease in DBO assumptions	(2.3)
Impact of increase in DBO assumptions	2.3
Longevity [member] \| US [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of decrease in DBO assumptions	0.0
Impact of increase in DBO assumptions	0.1
Longevity [member] \| United Kingdom [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Impact of decrease in DBO assumptions	(0.2)
Impact of increase in DBO assumptions	kr 0.2

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

No definition available.

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

+ References

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