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Intangible Assets - Summary of Intangible Assets (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Impairment losses | kr (137) | kr (55) | kr (529)
Capitalized development expenditure [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 4,040 |  |
Intangible assets and goodwill, Closing balance | 3,857 | 4,040 |
Capitalized development expenditure [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 18,681 | 23,719 |
Acquisitions/capitalization | 817 | 1,545 |
Balances regarding acquired/divested business |  | (2,099) |
Sales/disposals | (1,256) | (4,551) |
Translation differences | (193) | 67 |
Intangible assets and goodwill, Closing balance | 18,049 | 18,681 | 23,719
Capitalized development expenditure [member] | Accumulated depreciation and amortization [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | (10,896) | (14,768) |
Amortizations | (906) | (1,519) |
Balances regarding acquired/divested business |  | 843 |
Sales/disposals | 1,256 | 4,551 |
Translation differences | 99 | (3) |
Intangible assets and goodwill, Closing balance | (10,447) | (10,896) | (14,768)
Capitalized development expenditure [member] | Accumulated impairment losses [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | (3,745) | (4,714) |
Balances regarding acquired/divested business |  | 1,005 |
Impairment losses |  | (36) |
Intangible assets and goodwill, Closing balance | (3,745) | (3,745) | (4,714)
Goodwill [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 31,200 |  |
Intangible assets and goodwill, Closing balance | 34,945 | 31,200 |
Goodwill [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 37,847 | 43,294 |
Balances regarding acquired/divested business | 7,104 | (7,093) |
Translation differences | (3,359) | 1,646 |
Intangible assets and goodwill, Closing balance | 41,592 | 37,847 | 43,294
Goodwill [member] | Accumulated impairment losses [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | (6,647) | (13,259) |
Balances regarding acquired/divested business |  | 7,292 |
Translation differences |  | (680) |
Intangible assets and goodwill, Closing balance | (6,647) | (6,647) | (13,259)
IPR, brands and other intangible assets [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 2,491 |  |
Intangible assets and goodwill, Closing balance | 4,805 | 2,491 |
IPR, brands and other intangible assets [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 52,912 | 58,101 |
Acquisitions/capitalization | 396 | 4 |
Balances regarding acquired/divested business | 3,500 | (6,049) |
Sales/disposals | (48) | (112) |
Translation differences | (2,847) | 968 |
Intangible assets and goodwill, Closing balance | 53,913 | 52,912 | 58,101
IPR, brands and other intangible assets [member] | Accumulated depreciation and amortization [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | (43,018) | (47,277) |
Amortizations | (1,083) | (1,019) |
Balances regarding acquired/divested business | 35 | 5,922 |
Sales/disposals | 48 | 112 |
Translation differences | 2,297 | (756) |
Intangible assets and goodwill, Closing balance | (41,721) | (43,018) | (47,277)
IPR, brands and other intangible assets [member] | Accumulated impairment losses [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | (7,403) | (7,350) |
Balances regarding acquired/divested business |  | 55 |
Impairment losses | (137) | (19) |
Translation differences | 153 | (89) |
Intangible assets and goodwill, Closing balance | kr (7,387) | kr (7,403) | kr (7,350)

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