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Intangible Assets - Additional Information (Detail) kr in Millions, Mobile_subscriptions in Billions, Device in Billions | 12 Months Ended
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Dec. 31, 2025 Mobile_subscriptions Device | Dec. 31, 2020 SEK (kr) Mobile_subscriptions Device | Dec. 31, 2019 SEK (kr) | Dec. 31, 2018 SEK (kr)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill |  | kr 34,945 | kr 31,200 | kr 30,035
Write down of goodwill |  |  |  | 275
2020-2025 [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Estimated increase in mobile data traffic volume |  | 4 |  |
Smartphone traffic growth |  | 4 |  |
Percentage of estimated increase in mobile video traffic |  | 30.00% |  |
Percentage of estimated increase in mobile data traffic |  | 75.00% |  |
2021-2025 [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
After-tax discount rate |  | 8.00% | 8.10% |
Nominal annual growth rate |  | 1.00% | 1.00% |
2021-2025 [member] | CGU Emodo [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Discount rate for CGU |  | 12.00% |  |
Description of discount factor effects in impairment test |  | If the discount factor in the impairment test would have been increased by four percentage points to 16% no head room would remain. |  |
Percentage of discount rate affects to impairment test |  | 16.00% |  |
Carrying amount of CGU |  | kr 400 |  |
Subscription by 2025 [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Number of connected devices are forecasted | Device | 36.0 |  |  |
Mobile Subscriptions |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Estimated number of global mobile subscriptions | Mobile_subscriptions |  | 7.9 |  |
Mobile Subscriptions | Subscription by 2025 [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Estimated number of global mobile subscriptions | Mobile_subscriptions | 8.6 |  |  |
Smart phone [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Estimated number of global mobile subscriptions | Mobile_subscriptions |  | 7.3 |  |
5G subscriptions [member] | Subscription by 2025 [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Estimated number of global mobile subscriptions | Mobile_subscriptions | 2.8 |  |  |
Networks [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill |  | kr 24,100 | kr 26,500 |
Networks [member] | Research and development expenses [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Write down of portfolio antenna and filter business |  | 100 |  |
Digital services [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill |  | 3,000 | 3,300 |
Digital services [member] | Research and development expenses [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Write down of capitalized development expenses |  |  | 40 | 300
Emerging business and other [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill |  | 7,800 | 1,400 |
Emerging business and other [member] | Selling and administrative expenses [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Write down of goodwill |  |  | kr 20 |
Emerging business and other [member] | Other operating expenses [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill |  |  |  | 0
Write down of goodwill |  |  |  | kr 300
Emerging business and other [member] | Cradlepoint [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill |  | kr 6,500 |  |
Internet of things [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Number of connected devices are forecasted | Device |  | 1.7 |  |
Internet of things [member] | Subscription by 2025 [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Number of connected devices are forecasted | Device | 25.0 |  |  |
Number of connected devices are forecasted | Device | 5.2 |  |  |

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