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Segment Information - Summary of Reportable Segments (Parenthetical) (Detail) - SEK (kr) kr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of operating segments [line items]
Impairment charges of goodwill	kr (1,260)	kr (31,897)	kr 0
Gain on resolution of a commercial dispute	1,900
Provisions	11,715	11,706	11,588
Vonage Holdings Corp [member]
Disclosure of operating segments [line items]
Impairment charges of goodwill	(900)	kr (31,900)	(15,300)
Others [member]
Disclosure of operating segments [line items]
Provisions	(2,300)		(2,300)
IoT and other portfolio adjustments [member]
Disclosure of operating segments [line items]
Charges related to divestment of business	kr (1,000)		kr (1,000)

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- Definition

Charges related to divestment of business.

+ References

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- Definition

Gain on resolution of a commercial dispute.

+ References

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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.

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- Definition

The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2024-01-01
-Paragraph B67
-Subparagraph d
-Clause v
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B67_d_v&doctype=Appendix&subtype=B
-URIDate 2024-03-27

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- Definition

The amount of liabilities of uncertain timing or amount, including provisions for employee benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 54
-Subparagraph l
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_l&doctype=Standard
-URIDate 2024-03-27

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