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Intangible Assets - Summary of Intangible Assets (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Impairment losses | kr (313) | kr (137) | kr (55)
Capitalized development expenditure [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 3,857 |  |
Intangible assets and goodwill, Closing balance | 3,528 | 3,857 |
Capitalized development expenditure [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 18,049 | 18,681 |
Acquisitions/capitalization | 962 | 817 |
Sales/disposals |  | (1,256) |
Translation differences | 147 | (193) |
Intangible assets and goodwill, Closing balance | 19,158 | 18,049 | 18,681
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 | (10,447) | (10,896) |
Amortizations | (1,343) | (906) |
Sales/disposals |  | 1,256 |
Translation differences | (95) | 99 |
Intangible assets and goodwill, Closing balance | (11,885) | (10,447) | (10,896)
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) | (3,745) |
Intangible assets and goodwill, Closing balance | (3,745) | (3,745) | (3,745)
Goodwill [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 34,945 |  |
Intangible assets and goodwill, Closing balance | 38,204 | 34,945 |
Goodwill [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 41,592 | 37,847 |
Balances regarding acquired/divested business | 725 | 7,104 |
Translation differences | 2,646 | (3,359) |
Intangible assets and goodwill, Closing balance | 44,963 | 41,592 | 37,847
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) | (6,647) |
Impairment losses | (112) |  |
Intangible assets and goodwill, Closing balance | (6,759) | (6,647) | (6,647)
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 | 4,805 |  |
Intangible assets and goodwill, Closing balance | 3,830 | 4,805 |
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 | 53,913 | 52,912 |
Acquisitions/capitalization | 131 | 396 |
Balances regarding acquired/divested business | (95) | 3,500 |
Sales/disposals | (18) | (48) |
Translation differences | 2,005 | (2,847) |
Intangible assets and goodwill, Closing balance | 55,936 | 53,913 | 52,912
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 | (41,721) | (43,018) |
Amortizations | (1,164) | (1,083) |
Balances regarding acquired/divested business |  | 35 |
Sales/disposals | 18 | 48 |
Translation differences | (1,589) | 2,297 |
Intangible assets and goodwill, Closing balance | (44,456) | (41,721) | (43,018)
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 | (7,387) | (7,403) |
Impairment losses | (201) | (137) |
Translation differences | (62) | 153 |
Intangible assets and goodwill, Closing balance | kr (7,650) | kr (7,387) | kr (7,403)

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