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Financial Risk Management - Summary of Net Exposure for Largest Currencies Impact on Sales (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Cash flow hedges [member] |  |
Disclosure Of Currency Exposure [Line Items] |  |
Hedged Sales Volume | $ 200 | $ 517

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- Definition Disclosure of Currency Exposure [line items] + References No definition available. + Details
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Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Outstanding cash flow hedge sales volume. + References No definition available. + Details
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Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |