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Segment Information - Summary of Operating Segments (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of operating segments [line items] |  |  |
Net sales | kr 232,390 | kr 227,216 | kr 210,838
Gross income | kr 93,724 | kr 84,824 | kr 68,200
Gross margin | 40.30% | 37.30% | 32.30%
Operating income (loss) | kr 27,808 | kr 10,564 | kr 1,242
Operating margin | 12.00% | 4.60% | 0.60%
Financial income and expenses, net | kr (596) | kr (1,802) | kr (2,705)
Income after ﬁnancial items | 27,212 | 8,762 | (1,463)
Income tax | (9,589) | (6,922) | (4,813)
Net income (loss) | 17,623 | 1,840 | (6,276)
Other segment items |  |  |
Share in earnings of JV and associated companies | (298) | (335) | 58
Amortizations | (1,989) | (2,538) | (3,946)
Depreciations | (5,989) | (6,061) | (3,275)
Impairment losses | (696) | (490) | (1,097)
Restructuring expenses | (1,306) | (798) | (8,015)
Gains/losses on sale of investments and operations | (141) | 697 | (225)
Networks [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 165,978 | 155,009 | 138,570
Digital services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 37,324 | 39,857 | 38,089
Managed services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 22,600 | 25,565 | 25,770
Emerging business and other [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 6,488 | 6,785 | 8,409
Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 232,390 | 227,216 | 210,838
Gross income | kr 93,724 | kr 84,824 | kr 68,200
Gross margin | 40.30% | 37.30% | 32.30%
Operating income (loss) | kr 27,808 | kr 10,564 | kr 1,242
Operating margin | 12.00% | 4.60% | 0.60%
Other segment items |  |  |
Share in earnings of JV and associated companies | kr (298) | kr (335) | kr 58
Amortizations | (1,989) | (2,538) | (3,946)
Depreciations | (5,989) | (6,061) | (3,275)
Impairment losses | (696) | (490) | (1,097)
Restructuring expenses | (1,306) | (798) | (8,015)
Gains/losses on sale of investments and operations | (141) | 697 | (225)
Operating segments [member] | Networks [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 165,978 | 155,009 | 138,570
Gross income | kr 72,413 | kr 64,717 | kr 55,153
Gross margin | 43.60% | 41.80% | 39.80%
Operating income (loss) | kr 30,851 | kr 24,767 | kr 19,421
Operating margin | 18.60% | 16.00% | 14.00%
Other segment items |  |  |
Share in earnings of JV and associated companies | kr 37 | kr 26 | kr 28
Amortizations | (775) | (517) | (830)
Depreciations | (3,764) | (3,604) | (1,717)
Impairment losses | (494) | (295) | (308)
Restructuring expenses | (746) | (68) | (1,781)
Gains/losses on sale of investments and operations | (129) | (225) | (132)
Operating segments [member] | Digital services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 37,324 | 39,857 | 38,089
Gross income | kr 15,637 | kr 14,836 | kr 8,318
Gross margin | 41.90% | 37.20% | 21.80%
Operating income (loss) | kr (2,206) | kr (4,027) | kr (13,852)
Operating margin | (5.90%) | (10.10%) | (36.40%)
Other segment items |  |  |
Share in earnings of JV and associated companies | kr 28 | kr 41 | kr 27
Amortizations | (607) | (1,413) | (2,295)
Depreciations | (1,252) | (1,478) | (933)
Impairment losses | (119) | (128) | (406)
Restructuring expenses | (19) | (614) | (5,366)
Gains/losses on sale of investments and operations | 12 | (2) | (36)
Operating segments [member] | Managed services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 22,600 | 25,565 | 25,770
Gross income | kr 4,012 | kr 3,990 | kr 2,886
Gross margin | 17.80% | 15.60% | 11.20%
Operating income (loss) | kr 1,563 | kr 2,309 | kr 1,093
Operating margin | 6.90% | 9.00% | 4.20%
Other segment items |  |  |
Share in earnings of JV and associated companies | kr 5 | kr 3 | kr 3
Amortizations | (5) | (5) | (14)
Depreciations | (386) | (413) | (169)
Impairment losses | (25) | (24) | (29)
Restructuring expenses | (258) | (45) | (276)
Gains/losses on sale of investments and operations | 5 | (12) | (57)
Operating segments [member] | Emerging business and other [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 6,488 | 6,785 | 8,409
Gross income | kr 1,662 | kr 1,281 | kr 1,843
Gross margin | 25.60% | 18.90% | 21.90%
Operating income (loss) | kr (2,400) | kr (12,485) | kr (5,420)
Operating margin | (37.00%) | (184.00%) | (64.50%)
Other segment items |  |  |
Share in earnings of JV and associated companies | kr (368) | kr (405) |
Amortizations | (602) | (603) | kr (807)
Depreciations | (587) | (566) | (456)
Impairment losses | (58) | (43) | (354)
Restructuring expenses | (283) | (71) | kr (592)
Gains/losses on sale of investments and operations | kr (29) | kr 936 |

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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 2020-01-01 -Paragraph 23 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_23_g&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_28_e&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective on first application of IFRS 9 -Name IFRS -Number 4 -IssueDate 2020-01-01 -Paragraph 39M -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_39M_b&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 82 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_82_c&doctype=Standard -URIDate 2020-01-01 + Details
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