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Segment Information - Summary of Products and Services Segments (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]      
Total kr 263,351 kr 271,546 kr 232,314
Services [member]      
Disclosure of operating segments [line items]      
Total 104,586 97,522 80,117
Operating segments [member]      
Disclosure of operating segments [line items]      
Total 263,351 271,546 232,314
Operating segments [member] | Products [member]      
Disclosure of operating segments [line items]      
Total 158,765 174,024 152,197
Operating segments [member] | Services [member]      
Disclosure of operating segments [line items]      
Total 104,586 97,522 80,117
Networks [member]      
Disclosure of operating segments [line items]      
Total 171,442 193,468 167,838
Networks [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Total 171,442 193,468 167,838
Networks [member] | Operating segments [member] | Products [member]      
Disclosure of operating segments [line items]      
Total 131,393 147,997 128,951
Networks [member] | Operating segments [member] | Services [member]      
Disclosure of operating segments [line items]      
Total 40,049 45,471 38,887
Cloud Software and Services [Member]      
Disclosure of operating segments [line items]      
Total 63,630 60,524 56,224
Cloud Software and Services [Member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Total 63,630 60,524 56,224
Cloud Software and Services [Member] | Operating segments [member] | Products [member]      
Disclosure of operating segments [line items]      
Total 21,672 21,105 19,267
Cloud Software and Services [Member] | Operating segments [member] | Services [member]      
Disclosure of operating segments [line items]      
Total 41,958 39,419 36,957
Enterprise [Member]      
Disclosure of operating segments [line items]      
Total 25,745 14,597 5,513
Enterprise [Member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Total 25,745 14,597 5,513
Enterprise [Member] | Operating segments [member] | Products [member]      
Disclosure of operating segments [line items]      
Total 5,704 4,923 3,955
Enterprise [Member] | Operating segments [member] | Services [member]      
Disclosure of operating segments [line items]      
Total 20,041 9,674 1,558
Other [Member]      
Disclosure of operating segments [line items]      
Total 2,534 2,957 2,739
Other [Member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Total 2,534 2,957 2,739
Other [Member] | Operating segments [member] | Products [member]      
Disclosure of operating segments [line items]      
Total (4) (1) 24
Other [Member] | Operating segments [member] | Services [member]      
Disclosure of operating segments [line items]      
Total kr 2,538 kr 2,958 kr 2,715