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Segment Information - Summary of Geographical Information (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of geographical areas [line items] |  |  |
Net sales | kr 232,314 | kr 232,390 | kr 227,216
Non-current assets, total | 68,031 | 66,244 | 61,633
Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 167,838 | 165,978 | 155,009
Digital services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 36,151 | 37,324 | 39,857
Managed services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 20,379 | 22,600 | 25,565
Emerging business and other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 7,946 | 6,488 | 6,785
South East Asia, Oceania and India [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 28,829 | 30,048 | 29,776
Non-current assets, total | 1,010 | 812 | 1,199
South East Asia, Oceania and India [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 20,299 | 21,464 | 21,850
South East Asia, Oceania and India [member] | Digital services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 4,235 | 4,329 | 4,033
South East Asia, Oceania and India [member] | Managed services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 4,258 | 4,219 | 3,836
South East Asia, Oceania and India [member] | Emerging business and other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 37 | 36 | 57
North East Asia [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 29,121 | 33,334 | 26,400
Non-current assets, total | 2,700 | 2,648 | 2,881
North East Asia [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 24,464 | 27,120 | 20,339
North East Asia [member] | Digital services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 3,605 | 5,124 | 4,857
North East Asia [member] | Managed services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 800 | 831 | 1,026
North East Asia [member] | Emerging business and other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 252 | 259 | 178
North America [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 77,456 | 73,775 | 70,223
Non-current assets, total | 11,971 | 12,749 | 11,570
North America [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 66,464 | 62,199 | 55,808
North America [member] | Digital services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 7,988 | 7,979 | 9,646
North America [member] | Managed services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 2,925 | 3,529 | 4,673
North America [member] | Emerging business and other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 79 | 68 | 96
Europe and Latin America [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 60,272 | 55,745 | 59,006
Non-current assets, total | 52,141 | 49,895 | 45,832
Europe and Latin America [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 38,671 | 33,257 | 33,884
Europe and Latin America [member] | Digital services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 12,381 | 11,954 | 12,571
Europe and Latin America [member] | Managed services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 8,804 | 10,167 | 12,149
Europe and Latin America [member] | Emerging business and other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 416 | 367 | 402
Middle East and Africa [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 20,785 | 23,298 | 25,525
Non-current assets, total | 209 | 140 | 151
Middle East and Africa [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 10,743 | 13,281 | 14,604
Middle East and Africa [member] | Digital services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 6,436 | 6,144 | 7,015
Middle East and Africa [member] | Managed services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 3,592 | 3,854 | 3,881
Middle East and Africa [member] | Emerging business and other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 14 | 19 | 25
Other regions [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 15,851 | 16,190 | 16,286
Non-current assets, total | 0 | 0 | 0
Other regions [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 7,197 | 8,657 | 8,524
Other regions [member] | Digital services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 1,506 | 1,794 | 1,735
Other regions [member] | Managed services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 0 | 0 | 0
Other regions [member] | Emerging business and other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 7,148 | 5,739 | 6,027
Sweden [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 2,349 | 1,123 | 589
Non-current assets, total | 45,997 | 43,627 | 38,313
European union [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 31,307 | 29,501 | 35,729
Non-current assets, total | 50,428 | 48,133 | 44,306
US [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 79,896 | 77,835 | 73,279
Non-current assets, total | 10,749 | 11,533 | 10,176
China [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 10,078 | 18,745 | 15,860
Non-current assets, total | 2,202 | 2,136 | 2,402
JAPAN |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 13,678 | 12,150 | 8,890
Non-current assets, total | kr 261 | kr 272 | kr 184

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