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Segment Information - Summary of Products and Services Segments (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of operating segments [line items] |  |  |
Total | kr 232,314 | kr 232,390 | kr 227,216
Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 80,117 | 86,204 | 93,050
Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 232,314 | 232,390 | 227,216
Operating segments [member] | Products [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 152,197 | 146,186 | 134,166
Operating segments [member] | Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 80,117 | 86,204 | 93,050
Networks [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 167,838 | 165,978 | 155,009
Networks [member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 167,838 | 165,978 | 155,009
Networks [member] | Operating segments [member] | Products [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 128,951 | 122,229 | 109,122
Networks [member] | Operating segments [member] | Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 38,887 | 43,749 | 45,887
Digital services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 36,151 | 37,324 | 39,857
Digital services [member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 36,151 | 37,324 | 39,857
Digital services [member] | Operating segments [member] | Products [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 19,328 | 20,447 | 21,480
Digital services [member] | Operating segments [member] | Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 16,823 | 16,877 | 18,377
Managed services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 20,379 | 22,600 | 25,565
Managed services [member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 20,379 | 22,600 | 25,565
Managed services [member] | Operating segments [member] | Products [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 132 | 81 | 11
Managed services [member] | Operating segments [member] | Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 20,247 | 22,519 | 25,554
Emerging business and other [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 7,946 | 6,488 | 6,785
Emerging business and other [member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 7,946 | 6,488 | 6,785
Emerging business and other [member] | Operating segments [member] | Products [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 3,786 | 3,429 | 3,553
Emerging business and other [member] | Operating segments [member] | Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | kr 4,160 | kr 3,059 | kr 3,232

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