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Inventories - Additional Information (Detail) - SEK (kr) kr in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Inventories [Abstract] |  |  |  |
Inventories, recognized as expense | kr 61,647 | kr 58,249 |  |
Inventory obsolescence allowances | kr 3,627 | kr 3,386 | kr 2,611 | kr 2,425

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- Definition Allowance for inventory obsolescence. + References No definition available. + Details
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Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure of inventories. + References No definition available. + Details
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Namespace Prefix: | eric_
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Balance Type: | na
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- Definition The amount of inventories recognised as an expense during the period. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2020-01-01 -Paragraph 36 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=2&code=ifrs-tx-2020-en-r&anchor=para_36_d&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | debit
Period Type: | duration