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Segment Information - Summary of Geographical Information (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
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