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Segment Information - Summary of Geographical Information (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of geographical areas [line items] |  |  |
Net sales | kr 232,390 | kr 227,216 | kr 210,838
Non-current assets, total | 66,244 | 61,633 | 51,206
Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 165,978 | 155,009 | 138,570
Digital services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 37,324 | 39,857 | 38,089
Managed services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 22,600 | 25,565 | 25,770
Emerging business and other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 6,488 | 6,785 | 8,409
South East Asia, Oceania and India [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 30,048 | 29,776 | 29,589
Non-current assets, total | 812 | 1,199 | 445
South East Asia, Oceania and India [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 21,464 | 21,850 | 21,337
South East Asia, Oceania and India [member] | Digital services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 4,329 | 4,033 | 4,824
South East Asia, Oceania and India [member] | Managed services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 4,219 | 3,836 | 3,388
South East Asia, Oceania and India [member] | Emerging business and other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 36 | 57 | 40
North East Asia [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 33,334 | 26,400 | 22,309
Non-current assets, total | 2,648 | 2,881 | 1,833
North East Asia [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 27,120 | 20,339 | 15,915
North East Asia [member] | Digital services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 5,124 | 4,857 | 4,849
North East Asia [member] | Managed services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 831 | 1,026 | 1,465
North East Asia [member] | Emerging business and other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 259 | 178 | 80
North America [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 73,775 | 70,223 | 58,586
Non-current assets, total | 12,749 | 11,570 | 9,397
North America [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 62,199 | 55,808 | 46,452
North America [member] | Digital services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 7,979 | 9,646 | 8,358
North America [member] | Managed services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 3,529 | 4,673 | 3,680
North America [member] | Emerging business and other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 68 | 96 | 96
Europe and Latin America [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 55,745 | 59,006 | 59,563
Non-current assets, total | 49,895 | 45,832 | 39,481
Europe and Latin America [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 33,257 | 33,884 | 33,887
Europe and Latin America [member] | Digital services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 11,954 | 12,571 | 12,172
Europe and Latin America [member] | Managed services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 10,167 | 12,149 | 13,191
Europe and Latin America [member] | Emerging business and other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 367 | 402 | 313
Middle East and Africa [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 23,298 | 25,525 | 24,338
Non-current assets, total | 140 | 151 | 50
Middle East and Africa [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 13,281 | 14,604 | 13,826
Middle East and Africa [member] | Digital services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 6,144 | 7,015 | 6,451
Middle East and Africa [member] | Managed services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 3,854 | 3,881 | 4,046
Middle East and Africa [member] | Emerging business and other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 19 | 25 | 15
Other regions [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 16,190 | 16,286 | 16,453
Other regions [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 8,657 | 8,524 | 7,153
Other regions [member] | Digital services [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 1,794 | 1,735 | 1,435
Other regions [member] | Emerging business and other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 5,739 | 6,027 | 7,865
Sweden [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 1,123 | 589 | 2,315
Non-current assets, total | 43,627 | 38,313 | 34,434
European union [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 29,501 | 35,729 | 35,941
Non-current assets, total | 48,133 | 44,306 | 38,423
US [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 77,835 | 73,279 | 61,446
Non-current assets, total | 11,533 | 10,176 | 8,349
China [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 18,745 | 15,860 | 14,601
Non-current assets, total | kr 2,136 | kr 2,402 | kr 1,525

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