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Segment Information - Summary of Products and Services Segments (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]      
Total kr 247,880 kr 263,351 kr 271,546
Services [member]      
Disclosure of operating segments [line items]      
Total 97,730 104,586 97,522
Operating segments [member]      
Disclosure of operating segments [line items]      
Total 247,880 263,351 271,546
Operating segments [member] | Products [member]      
Disclosure of operating segments [line items]      
Total 150,150 158,765 174,024
Operating segments [member] | Services [member]      
Disclosure of operating segments [line items]      
Total 97,730 104,586 97,522
Networks [member]      
Disclosure of operating segments [line items]      
Total 158,207 171,442 193,468
Networks [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Total 158,207 171,442 193,468
Networks [member] | Operating segments [member] | Products [member]      
Disclosure of operating segments [line items]      
Total 121,814 131,393 147,997
Networks [member] | Operating segments [member] | Services [member]      
Disclosure of operating segments [line items]      
Total 36,393 40,049 45,471
Cloud Software and Services [Member]      
Disclosure of operating segments [line items]      
Total 62,635 63,630 60,524
Cloud Software and Services [Member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Total 62,635 63,630 60,524
Cloud Software and Services [Member] | Operating segments [member] | Products [member]      
Disclosure of operating segments [line items]      
Total 22,409 21,672 21,105
Cloud Software and Services [Member] | Operating segments [member] | Services [member]      
Disclosure of operating segments [line items]      
Total 40,226 41,958 39,419
Enterprise [Member]      
Disclosure of operating segments [line items]      
Total 24,863 25,745 14,597
Enterprise [Member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Total 24,863 25,745 14,597
Enterprise [Member] | Operating segments [member] | Products [member]      
Disclosure of operating segments [line items]      
Total 5,927 5,704 4,923
Enterprise [Member] | Operating segments [member] | Services [member]      
Disclosure of operating segments [line items]      
Total 18,936 20,041 9,674
Other [Member]      
Disclosure of operating segments [line items]      
Total 2,175 2,534 2,957
Other [Member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Total 2,175 2,534 2,957
Other [Member] | Operating segments [member] | Products [member]      
Disclosure of operating segments [line items]      
Total 0 (4) (1)
Other [Member] | Operating segments [member] | Services [member]      
Disclosure of operating segments [line items]      
Total kr 2,175 kr 2,538 kr 2,958