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Intangible Assets - Additional Information (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 reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill |  | kr 52,944 | kr 84,570 |
Impairment charges of goodwill |  | kr (31,897) | 0 | kr (112)
Number of connected devices are forecasted |  | 26,000,000,000 |  |
Percentage of decrease in long term Ebit |  | 1.00% |  |
Intangible assets other than goodwill |  | kr 22,667 | 26,340 |
By The End Of Two Thousand And Twenty Four [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Estimated number of devices to be manufactured |  | 3,500,000,000 |  |
By The End Of Two Thousand And Twenty Eight [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Estimated number of devices to be manufactured |  | 5,500,000,000 |  |
Forecast [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Percentage of decrease in long term Ebit |  | 1.00% |  |
Vonage Holdings Corp [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Impairment charges of goodwill | kr (31,900) | kr (31,900) |  |
Recoverable amount cash generating unit |  | kr 29,500 |  |
Percentage of goodwill and other intangible assets |  | 50.00% |  |
Cradlepoint [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill |  | kr 9,000 | 9,000 |
2024-2028 and 2028 [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Percentage of estimated increase in mobile video traffic |  | 25.00% |  |
Percentage of estimated increase in mobile data traffic |  | 70.00% |  |
Percentage fixed wireless access of estimated increase in mobile data traffic |  | 25.00% |  |
Percentage fixed wireless access of estimated increase in mobile traffic |  | 30.00% |  |
Subscription by 2028 [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Number of connected devices are forecasted |  | 46,000,000,000 |  |
Mobile Subscriptions [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Estimated number of global mobile subscriptions |  | 8,500,000,000 |  |
Mobile Subscriptions [member] | Subscription by 2028 [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Estimated number of global mobile subscriptions |  | 9,100,000,000 |  |
Smart phone [member] | Subscription by 2028 [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Estimated number of global mobile subscriptions |  | 8,200,000,000 |  |
5G subscriptions [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Estimated number of global mobile subscriptions |  | 1,600,000,000 |  |
5G subscriptions [member] | Subscription by 2028 [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Estimated number of global mobile subscriptions |  | 4,700,000,000 |  |
Enterprise Private Network and Wireless WAN [Member] | 2022-2027 [member] | Forecast [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Compound Annual Growth Rate |  | 24.00% |  |
Enterprise Private Network and Wireless WAN [Member] | 2023-2026 [member] | Forecast [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Compound Annual Growth Rate |  | 24.00% |  |
Capitalised development expenditure [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Remaining amortisation period of intangible assets |  | 3 years |  |
Customer Relationships IPR and other Intangible Assets [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangible assets other than goodwill |  | kr 22,700 | 26,300 |
Customer Relationships IPR and other Intangible Assets [Member] | Top of range [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Remaining amortisation period of intangible assets |  | 9 years |  |
Customer Relationships IPR and other Intangible Assets [Member] | Bottom of range [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Remaining amortisation period of intangible assets |  | 6 years |  |
Networks [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill |  | kr 27,800 | kr 28,500 |
Nominal annual growth rate |  | 2.00% | 2.00% |
Internet of things [member] | Subscription by 2028 [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Number of connected devices are forecasted |  | 30,000,000,000 |  |
Cash Generating Unit [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill |  | kr 300 |  |
Goodwill |  | kr 300 |  |
Cash Generating Unit [Member] | 2022-2027 [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Nominal annual growth rate |  | 15.00% | (20.00%) |
Vonage [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill |  | kr 11,100 | kr 42,000 |
Nominal annual growth rate |  | 3.50% | 3.50% |
Head room of CGU |  | kr 1,100 |  |
Vonage [Member] | Customer Relationships IPR and other Intangible Assets [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangible assets other than goodwill |  | 16,100 | kr 18,800 |
Cloud Software and Services [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill |  | kr 3,500 | kr 3,600 |
Write down of capitalized development expenses |  |  |  | 137
Nominal annual growth rate |  | 1.50% | 2.00% |
Enterprise [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill |  | kr 21,600 | kr 52,500 |
Write down of capitalized development expenses |  |  | kr 61 | kr 176

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