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Business Combinations - Additional Information (Detail) - SEK (kr) kr in Millions		12 Months Ended
	Jul. 21, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Business Combinations [Line Items]
Cash flow effect pursuant to business combinations		kr 141	kr 1,309
Goodwill		kr 1,260	31,897	kr 0
Enterprise [Member]
Disclosure Of Business Combinations [Line Items]
Business acquisition, ownership percentage		83.30%
Divestments [Member]
Disclosure Of Business Combinations [Line Items]
Cash flow effect pursuant to business combinations		kr 0	(633)
Vonage Holdings Corp [member]
Disclosure Of Business Combinations [Line Items]
Date of acquisition	Jul. 21, 2022
Intangible assets		13,800
Goodwill		kr 900	kr 31,900	kr 15,300

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- Definition

The date on which the acquirer obtains control of the acquiree in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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The percentage of voting equity interests acquired in a business combination. [Refer: Total for all business combinations [member]]

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