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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

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