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Segment Information - Summary of Geographical Information (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of geographical areas [line items]      
Net sales kr 247,880 kr 263,351 kr 271,546
Non-current assets, total 87,540 100,546 138,257
Networks [member]      
Disclosure of geographical areas [line items]      
Net sales 158,207 171,442 193,468
Cloud Software and Services [Member]      
Disclosure of geographical areas [line items]      
Net sales 62,635 63,630 60,524
Enterprise [Member]      
Disclosure of geographical areas [line items]      
Net sales 24,863 25,745 14,597
Other [Member]      
Disclosure of geographical areas [line items]      
Net sales 2,175 2,534 2,957
North America [member]      
Disclosure of geographical areas [line items]      
Net sales 72,886 59,230 95,394
Non-current assets, total 18,223 33,214 41,065
North America [member] | Networks [member]      
Disclosure of geographical areas [line items]      
Net sales 57,875 44,640 81,917
North America [member] | Cloud Software and Services [Member]      
Disclosure of geographical areas [line items]      
Net sales 14,326 14,199 13,362
North America [member] | Enterprise [Member]      
Disclosure of geographical areas [line items]      
Net sales 598 266 47
North America [member] | Other [Member]      
Disclosure of geographical areas [line items]      
Net sales 87 125 68
Europe and Latin America [member]      
Disclosure of geographical areas [line items]      
Net sales 63,410 64,884 66,790
Non-current assets, total 66,765 64,497 93,612
Europe and Latin America [member] | Networks [member]      
Disclosure of geographical areas [line items]      
Net sales 40,855 42,298 44,644
Europe and Latin America [member] | Cloud Software and Services [Member]      
Disclosure of geographical areas [line items]      
Net sales 22,271 22,270 21,638
Europe and Latin America [member] | Enterprise [Member]      
Disclosure of geographical areas [line items]      
Net sales 284 245 99
Europe and Latin America [member] | Other [Member]      
Disclosure of geographical areas [line items]      
Net sales 0 71 409
South East Asia, Oceania and India [member]      
Disclosure of geographical areas [line items]      
Net sales 32,410 53,318 32,951
Non-current assets, total 1,005 886 999
South East Asia, Oceania and India [member] | Networks [member]      
Disclosure of geographical areas [line items]      
Net sales 23,259 43,235 23,695
South East Asia, Oceania and India [member] | Cloud Software and Services [Member]      
Disclosure of geographical areas [line items]      
Net sales 9,114 10,038 9,179
South East Asia, Oceania and India [member] | Enterprise [Member]      
Disclosure of geographical areas [line items]      
Net sales 37 36 17
South East Asia, Oceania and India [member] | Other [Member]      
Disclosure of geographical areas [line items]      
Net sales 0 9 60
North East Asia [member]      
Disclosure of geographical areas [line items]      
Net sales 18,761 23,932 26,733
Non-current assets, total 1,374 1,775 3,385
North East Asia [member] | Networks [member]      
Disclosure of geographical areas [line items]      
Net sales 14,477 18,986 22,488
North East Asia [member] | Cloud Software and Services [Member]      
Disclosure of geographical areas [line items]      
Net sales 4,142 4,720 4,015
North East Asia [member] | Enterprise [Member]      
Disclosure of geographical areas [line items]      
Net sales 18 37 8
North East Asia [member] | Other [Member]      
Disclosure of geographical areas [line items]      
Net sales 124 189 222
Middle East and Africa [member]      
Disclosure of geographical areas [line items]      
Net sales 20,771 23,739 22,571
Non-current assets, total 173 174 (804)
Middle East and Africa [member] | Networks [member]      
Disclosure of geographical areas [line items]      
Net sales 10,344 12,902 11,707
Middle East and Africa [member] | Cloud Software and Services [Member]      
Disclosure of geographical areas [line items]      
Net sales 9,761 10,457 10,472
Middle East and Africa [member] | Enterprise [Member]      
Disclosure of geographical areas [line items]      
Net sales 678 378 368
Middle East and Africa [member] | Other [Member]      
Disclosure of geographical areas [line items]      
Net sales (12) 2 24
Other regions [member]      
Disclosure of geographical areas [line items]      
Net sales 39,642 38,248 27,107
Non-current assets, total 0 0 0
Other regions [member] | Networks [member]      
Disclosure of geographical areas [line items]      
Net sales 11,397 9,381 9,017
Other regions [member] | Cloud Software and Services [Member]      
Disclosure of geographical areas [line items]      
Net sales 3,021 1,946 1,858
Other regions [member] | Enterprise [Member]      
Disclosure of geographical areas [line items]      
Net sales 23,248 24,783 14,058
Other regions [member] | Other [Member]      
Disclosure of geographical areas [line items]      
Net sales 1,976 2,138 2,174
United States [member]      
Disclosure of geographical areas [line items]      
Net sales 98,265 85,313 109,709
Non-current assets, total 17,175 32,133 39,906
European union [Member]      
Disclosure of geographical areas [line items]      
Net sales 35,264 34,257 35,859
Non-current assets, total 62,126 59,456 92,167
Sweden [member]      
Disclosure of geographical areas [line items]      
Net sales 2,341 1,774 3,239
Non-current assets, total 61,065 58,728 88,057
India [member]      
Disclosure of geographical areas [line items]      
Net sales 15,194 31,205 10,957
Non-current assets, total 569 535 519
Japan [member]      
Disclosure of geographical areas [line items]      
Net sales 9,072 10,139 9,965
Non-current assets, total 199 132 187
China [member]      
Disclosure of geographical areas [line items]      
Net sales 10,221 10,716 10,523
Non-current assets, total kr 1,007 kr 1,449 kr 2,068