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Segment Information - Summary of Products and Services Segments (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of operating segments [line items] |  |  |
Total | kr 232,390 | kr 227,216 | kr 210,838
Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 86,204 | 93,050 | 89,413
Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 232,390 | 227,216 | 210,838
Operating segments [member] | Products [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 146,186 | 134,166 | 121,425
Operating segments [member] | Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 86,204 | 93,050 | 89,413
Networks [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 165,978 | 155,009 | 138,570
Networks [member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 165,978 | 155,009 | 138,570
Networks [member] | Operating segments [member] | Products [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 122,229 | 109,122 | 96,931
Networks [member] | Operating segments [member] | Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 43,749 | 45,887 | 41,639
Digital services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 37,324 | 39,857 | 38,089
Digital services [member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 37,324 | 39,857 | 38,089
Digital services [member] | Operating segments [member] | Products [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 20,447 | 21,480 | 20,458
Digital services [member] | Operating segments [member] | Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 16,877 | 18,377 | 17,631
Managed services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 22,600 | 25,565 | 25,770
Managed services [member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 22,600 | 25,565 | 25,770
Managed services [member] | Operating segments [member] | Products [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 81 | 11 |
Managed services [member] | Operating segments [member] | Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 22,519 | 25,554 | 25,770
Emerging business and other [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 6,488 | 6,785 | 8,409
Emerging business and other [member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 6,488 | 6,785 | 8,409
Emerging business and other [member] | Operating segments [member] | Products [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 3,429 | 3,553 | 4,036
Emerging business and other [member] | Operating segments [member] | Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | kr 3,059 | kr 3,232 | kr 4,373

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