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Contractual Obligations - Additional Information (Detail) - Contractual obligations [member] - SEK (kr) kr in Billions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of Contractual Obligations [line items] |  |
Purchase obligations | kr 15.2 | kr 11.3
Stock held by providers [member] |  |
Disclosure of Contractual Obligations [line items] |  |
Purchase obligations | kr 1.6 |

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- Definition Disclosure of contractual obligation. + References No definition available. + Details
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- Definition Purchase obligations. + References No definition available. + Details
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Namespace Prefix: | eric_
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Period Type: | instant

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

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