Related party transactions - Summary of Related Party Transactions (Detail) - Ericsson Nikola Tesla [member] - SEK (kr) kr in Billions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of transactions between related parties [line items]
Sales to Ericsson Nikola Tesla	kr 0.4	kr 0.4	kr 0.3
Purchases from Ericsson Nikola Tesla	kr 1.6	kr 1.6	kr 1.5

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

No definition available.

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- Definition

The amount of goods purchased by the entity in related party transactions. [Refer: Total for all related parties [member]]

+ References

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- Definition

The amount of revenue arising from the sale of goods in related party transactions. [Refer: Revenue; Total for all related parties [member]]

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