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Business Combinations - Additional Information (Detail) - SEK (kr) kr in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 03, 2023 | Jul. 21, 2022 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure Of Business Combinations [Line Items] |  |  |  |  |  |
Cash flow effect pursuant to business combinations |  |  |  | kr 1,309 | kr 51,734 |
Goodwill |  |  |  | 31,897 | 0 | kr 112
Deferred consideration payable |  |  |  | 7 |  |
Divestments [Member] |  |  |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |  |  |
Cash flow effect pursuant to business combinations |  |  |  | (633) | kr 20 |
Vonage Holdings Corp [member] |  |  |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |  |  |
Date of acquisition |  | Jul. 21, 2022 |  |  |  |
Goodwill |  |  | kr 31,900 | kr 31,900 |  |
Ericom Software Limited [Member] | Cradlepoint [Member] |  |  |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |  |  |
Date of acquisition | Apr. 03, 2023 |  |  |  |  |
Business acquisition, ownership percentage |  |  |  | 100.00% |  |
Vonage [Member] |  |  |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |  |  |
Date of acquisition |  |  |  | Jul. 01, 2022 |  |
Cash and cash equivalents in subsidiary or businesses acquired or disposed |  |  |  | kr 737 |  |

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