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Related Party Transactions - Additional Information (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Transactions Between Related Parties [Line Items] |  |  |
Percentage of ownership | 49.07% |  |
Ericsson Nikola Tesla d.d | Croatia |  |  |
Disclosure Of Transactions Between Related Parties [Line Items] |  |  |
Sales from associates | kr 0.4 | kr 0.4 | kr 0.6
Purchase from associates | kr 1.2 | kr 1.2 | kr 1.5
Percentage of ownership | 49.07% |  |

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