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Segment Information - Summary of Reportable Segments (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of reportable segments [line items] |  |  |
Net sales | kr 263,351 | kr 271,546 | kr 232,314
Gross income | 101,602 | 113,295 | 100,749
Earnings (loss) before financial items and income tax (EBIT) | (20,326) | 27,020 | 31,780
Financial income and expenses, net | (2,993) | (2,411) | (2,530)
Income (loss) after financial items | (23,319) | 24,609 | 29,250
Income tax | (2,785) | (5,497) | (6,270)
Net Income (Loss) | (26,104) | 19,112 | 22,980
Other segment items |  |  |
Share in earnings of JV and associated companies | 124 | 17 | (260)
Impairment losses | (154) | (66) |
Restructuring charges | (6,521) | (399) | (549)
Networks [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Net sales | 171,442 | 193,468 | 167,838
Cloud Software and Services [Member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Net sales | 63,630 | 60,524 | 56,224
Enterprise [Member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Net sales | 25,745 | 14,597 | 5,513
Segment information [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Net sales | 263,351 | 271,546 | 232,314
Gross income | kr 101,602 | kr 113,295 | kr 100,749
Gross margin | 38.60% | 41.70% | 43.40%
Earnings (loss) before financial items and income tax (EBIT) | kr (20,326) | kr 27,020 | kr 31,780
EBIT margin | (7.70%) | 10.00% | 13.70%
Financial income and expenses, net | kr (2,993) | kr (2,411) | kr (2,530)
Income (loss) after financial items | (23,319) | 24,609 | 29,250
Income tax | (2,785) | (5,497) | (6,270)
Net Income (Loss) | (26,104) | 19,112 | 22,980
Other segment items |  |  |
Share in earnings of JV and associated companies | 124 | 17 | (260)
Amortizations | (4,458) | (3,577) | (2,507)
Depreciations | (6,699) | (6,565) | (5,951)
Impairment losses | (32,732) | (401) | (511)
Restructuring charges | (6,521) | (399) | (549)
Gains/losses on sale of investments and operations | (285) | 256 | 961
Segment information [member] | Networks [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Net sales | 171,442 | 193,468 | 167,838
Gross income | kr 67,959 | kr 86,368 | kr 78,869
Gross margin | 39.60% | 44.60% | 47.00%
Earnings (loss) before financial items and income tax (EBIT) | kr 19,382 | kr 38,512 | kr 37,266
EBIT margin | 11.30% | 19.90% | 22.20%
Other segment items |  |  |
Share in earnings of JV and associated companies | kr 83 | kr 30 | kr 40
Amortizations | (1,013) | (1,424) | (1,169)
Depreciations | (4,460) | (4,073) | (3,764)
Impairment losses | (527) | (211) | (127)
Restructuring charges | (4,437) | (146) | (262)
Gains/losses on sale of investments and operations | (24) | 253 | 14
Segment information [member] | Cloud Software and Services [Member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Net sales | 63,630 | 60,524 | 56,224
Gross income | kr 22,088 | kr 20,106 | kr 18,829
Gross margin | 34.70% | 33.20% | 33.50%
Earnings (loss) before financial items and income tax (EBIT) | kr (220) | kr (1,689) | kr (2,234)
EBIT margin | (0.30%) | 2.80% | 4.00%
Other segment items |  |  |
Share in earnings of JV and associated companies | kr 41 | kr 27 | kr 72
Amortizations | (43) | (122) | (508)
Depreciations | (1,470) | (1,792) | (1,568)
Impairment losses | (176) | (91) | (185)
Restructuring charges | (1,924) | (96) | (254)
Gains/losses on sale of investments and operations | (39) | 0 | (51)
Segment information [member] | Enterprise [Member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Net sales | 25,745 | 14,597 | 5,513
Gross income | kr 12,016 | kr 7,096 | kr 3,026
Gross margin | 46.70% | 48.60% | 54.90%
Earnings (loss) before financial items and income tax (EBIT) | kr (38,336) | kr (4,473) | kr (1,774)
EBIT margin | (148.90%) | 30.60% | 32.20%
Other segment items |  |  |
Share in earnings of JV and associated companies | kr 0 | kr 0 | kr 0
Amortizations | (3,401) | (2,019) | (830)
Depreciations | (274) | (515) | (430)
Impairment losses | (31,952) | (87) | (188)
Restructuring charges | (173) | (65) | 9
Gains/losses on sale of investments and operations | (16) | 111 | 998
Segment information [member] | Others [Member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Net sales | 2,534 | 2,957 | 2,739
Gross income | kr (461) | kr (275) | kr 25
Gross margin | (18.20%) | 9.30% | 0.90%
Earnings (loss) before financial items and income tax (EBIT) | kr (1,152) | kr (5,330) | kr (1,478)
EBIT margin | (45.50%) | 180.30% | 54.00%
Other segment items |  |  |
Share in earnings of JV and associated companies | kr 0 | kr (40) | kr (372)
Amortizations | (1) | (12) | 0
Depreciations | (495) | (185) | (189)
Impairment losses | (77) | (12) | (11)
Restructuring charges | 13 | (92) | (42)
Gains/losses on sale of investments and operations | kr (206) | kr (108) | kr 0

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- Definition The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2023-01-01 -Paragraph 28 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_28_e&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2023-01-01 -Paragraph 23 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_23_g&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 82 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_82_c&doctype=Standard -URIDate 2023-03-23 + Details
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