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Intangible Assets - Additional Information (Detail) kr in Millions, Employee in Billions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 SEK (kr) Employee | Dec. 31, 2020 SEK (kr)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Goodwill | kr 38,204 | kr 34,945
2020-2025 [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
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] |  |
Nominal annual growth rate | 1.50% | 1.00%
Subscription by 2025 [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Number of connected devices are forecasted | Employee | 39.0 |
Mobile Subscriptions |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Estimated number of global mobile subscriptions | Employee | 8.3 |
Mobile Subscriptions | Subscription by 2025 [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Estimated number of global mobile subscriptions | Employee | 8.8 |
Smart phone [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Estimated number of global mobile subscriptions | Employee | 7.7 |
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 | Employee | 3.7 |
Selling and administrative expenses [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Write down of portfolio antenna and filter business | kr 112 |
Write down of capitalized development expenses | kr 64 |
Cradlepoint [member] | Later than ten years and not later than fifteen years [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Nominal annual growth rate | 10.00% |
Networks [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Goodwill | kr 25,800 | kr 24,100
Digital services [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Goodwill | 3,200 | 3,000
Write down of capitalized development expenses | 137 |
Emerging business and other [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Goodwill | 9,200 | 7,800
Write down of capitalized development expenses | 176 |
Emerging business and other [member] | Cradlepoint [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Goodwill | kr 7,900 | 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 | Employee | 2.4 |
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 | Employee | 27.0 |
Number of connected devices are forecasted | Employee | 4.8 |
cash Generating Unit [Member] | 2021-2025 [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Nominal annual growth rate | 25.00% |

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