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Related Party Transactions - Additional Information (Detail) - Ericsson Nikola Tesla d.d - Croatia - SEK (kr) kr in Billions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Transactions Between Related Parties [Line Items] |  |  |
Sales from associates | kr 0.4 | kr 0.6 | kr 0.6
Purchase from associates | kr 1.2 | kr 1.5 | kr 1.3
Percentage of ownership | 49.07% |  |

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