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Post-Employment Benefits - Summary of Change in the Net Defined Benefit Obligation (Parenthetical) (Detail) - SEK (kr) kr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disclosure of net defined benefit liability (asset) [line items]
Weighted average duration of DBO	16 years 9 months 18 days	16 years 9 months 18 days
Asset ceiling excluded from defined benefit cost recognized in income statement	kr 65	kr 62
2025 [member]
Disclosure of net defined benefit liability (asset) [line items]
Expected contributions to plan	kr 2,800

X

- Definition

Gain loss on changes in asset ceiling recognised in income statement.

+ References

No definition available.

+ Details

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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.

+ References

No definition available.

+ Details

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X

- Definition

The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 147
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_147_b&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 148
-Subparagraph d
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_148_d_iii&doctype=Standard
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- Definition

The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]]

+ References

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-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 147
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_147_c&doctype=Standard
-URIDate 2024-03-27

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