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Segment Information - Summary of Geographical Information (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of geographical areas [line items] |  |  |
Net sales | kr 263,351 | kr 271,546 | kr 232,314
Non-current assets, total | 100,546 | 138,257 | 68,031
Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 171,442 | 193,468 | 167,838
Cloud Software and Services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 63,630 | 60,524 | 56,224
Enterprise [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 25,745 | 14,597 | 5,513
Other [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 2,534 | 2,957 | 2,739
South East Asia, Oceania and India [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 53,318 | 32,951 | 28,829
Non-current assets, total | 886 | 999 | 1,010
South East Asia, Oceania and India [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 43,235 | 23,695 | 20,299
South East Asia, Oceania and India [member] | Cloud Software and Services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 10,038 | 9,179 | 8,493
South East Asia, Oceania and India [member] | Enterprise [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 36 | 17 | 10
South East Asia, Oceania and India [member] | Other [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 9 | 60 | 27
North East Asia [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 23,932 | 26,733 | 29,121
Non-current assets, total | 1,775 | 3,385 | 2,700
North East Asia [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 18,986 | 22,488 | 24,464
North East Asia [member] | Cloud Software and Services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 4,720 | 4,015 | 4,405
North East Asia [member] | Enterprise [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 37 | 8 | 1
North East Asia [member] | Other [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 189 | 222 | 251
North America [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 59,230 | 95,394 | 77,456
Non-current assets, total | 33,214 | 41,065 | 11,971
North America [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 44,640 | 81,917 | 66,464
North America [member] | Cloud Software and Services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 14,199 | 13,362 | 10,913
North America [member] | Enterprise [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 266 | 47 | 20
North America [member] | Other [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 125 | 68 | 59
Europe and Latin America [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 64,884 | 66,790 | 60,272
Non-current assets, total | 64,497 | 93,612 | 52,141
Europe and Latin America [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 42,298 | 44,644 | 38,671
Europe and Latin America [member] | Cloud Software and Services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 22,270 | 21,638 | 21,181
Europe and Latin America [member] | Enterprise [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 245 | 99 | 41
Europe and Latin America [member] | Other [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 71 | 409 | 379
Middle East and Africa [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 23,739 | 22,571 | 20,785
Non-current assets, total | 174 | (804) | 209
Middle East and Africa [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 12,902 | 11,707 | 10,743
Middle East and Africa [member] | Cloud Software and Services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 10,457 | 10,472 | 9,726
Middle East and Africa [member] | Enterprise [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 378 | 368 | 309
Middle East and Africa [member] | Other [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 2 | 24 | 7
Other regions [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 38,248 | 27,107 | 15,851
Non-current assets, total | 0 | 0 | 0
Other regions [member] | Networks [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 9,381 | 9,017 | 7,197
Other regions [member] | Cloud Software and Services [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 1,946 | 1,858 | 1,506
Other regions [member] | Enterprise [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 24,783 | 14,058 | 5,132
Other regions [member] | Other [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 2,138 | 2,174 | 2,016
European union [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 34,257 | 35,859 | 31,307
Non-current assets, total | 59,456 | 92,167 | 50,428
Sweden [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 1,774 | 3,239 | 2,349
Non-current assets, total | 58,728 | 88,057 | 45,997
United States [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 85,313 | 109,709 | 79,896
Non-current assets, total | 32,133 | 39,906 | 10,749
India [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 31,205 | 10,957 | 7,482
Non-current assets, total | 535 | 519 | 484
Japan [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 10,139 | 9,965 | 13,678
Non-current assets, total | 132 | 187 | 261
China [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Net sales | 10,716 | 10,523 | 10,078
Non-current assets, total | kr 1,449 | kr 2,068 | kr 2,202

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