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Business Combinations - Additional Information (Detail) - SEK (kr) kr in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 01, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Business Combinations [Line Items] |  |  |  |
Cash flow effect |  |  | kr 4 | kr 360
Acquisitions 2018-2020 [member] |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |
Cash flow effect pursuant to business combinations |  |  | kr (9,534) | kr (1,815)
Cradlepoint [member] |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |
Date of acquisition | Nov. 01, 2020 |  | Nov. 01, 2020 |
Genaker [member] |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |
Date of acquisition |  | Mar. 31, 2020 |  |
Business acquisition, ownership percentage |  | 100.00% |  |
Kathrein [member] |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |
Date of acquisition |  |  | Oct. 31, 2019 |
Increase in intangible assets |  |  | kr 188 |
Decrease in other assets |  |  | 119 |
Increase in assumed liabilities |  |  | kr 69 |

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- Definition Effect on cash flow due to divestment. + References No definition available. + Details
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- Definition Increased decrease in identifiable acquired liabilities assumed. + References No definition available. + Details
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- Definition Increased decrease in other assets recognised as of acquisition date. + References No definition available. + Details
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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 -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph B64 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B64_b&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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- Definition The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph B64 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B64_c&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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- Details
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