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Inventories - Movements in Obsolescence Allowances (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Inventories [Abstract] |  |
Inventory obsolescence allowances, Opening balance | kr 3,627 | kr 3,386
Additions, net | 1,378 | 2,266
Utilization | (1,457) | (1,781)
Translation differences | 128 | (244)
Inventory obsolescence allowances, Closing balance | kr 3,676 | kr 3,627

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

X
- Definition Disclosure of inventories. + References No definition available. + Details
Name: | eric_DisclosureOfInventoriesAbstract
Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Inventory allowance addition net. + References No definition available. + Details
Name: | eric_InventoryAllowanceAdditionNet
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Inventory recognised as foreign currency translation difference. + References No definition available. + Details
Name: | eric_InventoryRecognisedAsForeignCurrencyTranslationDifference
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Utilization of inventory. + References No definition available. + Details
Name: | eric_UtilizationOfInventory
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration