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Segment Information - Summary of Reportable Segments (Parenthetical) (Detail) - SEK (kr) kr in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of operating segments [line items] |  |  |  |
Impairment charges of goodwill |  | kr (31,897) | kr 0 | kr (112)
Provisions |  | 11,706 | 11,588 | kr 9,504
Vonage Holdings Corp [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Impairment charges of goodwill | kr (31,900) | kr (31,900) |  |
Others [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Provisions |  |  | (2,300) |
IoT and other portfolio adjustments [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Charges related to divestment of business |  |  | kr (1,000) |

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