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Post-Employment Benefits - Summary of Amount Recognized in the Consolidated Balance Sheet (Detail) - SEK (kr) kr in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of defined benefit plans [line items]
Defined benefit obligation (DBO)	kr 86,598	kr 85,535
Fair value of plan assets	64,359	62,593
Deficit/surplus (+/–)	22,239	22,942
Plans with net surplus, excluding asset ceiling	2,209	3,287
Provision for post-employment benefits	24,448	26,229
Sweden [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation (DBO)	49,423	50,043
Fair value of plan assets	31,191	29,627
Deficit/surplus (+/–)	18,232	20,416
Plans with net surplus, excluding asset ceiling	0	0
Provision for post-employment benefits	18,232	20,416
US [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation (DBO)	5,340	5,073
Fair value of plan assets	5,153	4,815
Deficit/surplus (+/–)	187	258
Plans with net surplus, excluding asset ceiling	330	255
Provision for post-employment benefits	517	513
United Kingdom [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation (DBO)	10,473	10,595
Fair value of plan assets	11,195	12,410
Deficit/surplus (+/–)	(722)	(1,815)
Plans with net surplus, excluding asset ceiling	727	1,889
Provision for post-employment benefits	5	74
Other Countries [member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation (DBO)	21,362	19,824
Fair value of plan assets	16,820	15,741
Deficit/surplus (+/–)	4,542	4,083
Plans with net surplus, excluding asset ceiling	1,152	1,143
Provision for post-employment benefits	kr 5,694	kr 5,226

X

- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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.

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No definition available.

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- Definition

The amount of non-current net defined benefit liability. [Refer: Net defined benefit liability]

+ References

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- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

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- Definition

The amount of surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]]

+ References

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