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Intangible Assets - Summary of Intangible Assets (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Impairment losses | kr (31,916) | kr (61) | kr (313)
Capitalized development expenditure [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 3,705 |  |
Intangible assets and goodwill, Closing balance | 4,678 | 3,705 |
Capitalized development expenditure [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 21,096 | 19,158 |
Additions | 2,173 | 1,720 |
Balances regarding acquired/divested business | 0 |  |
Disposals | (153) |  |
Reclassifications | (16) |  |
Translation differences | (117) | 218 |
Intangible assets and goodwill, Closing balance | 22,983 | 21,096 | 19,158
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 | (13,646) | (11,885) |
Amortizations | (1,137) | (1,586) |
Balances regarding acquired/divested business | 0 |  |
Disposals | 153 |  |
Translation differences | 70 | (175) |
Intangible assets and goodwill, Closing balance | (14,560) | (13,646) | (11,885)
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) |
Balances regarding acquired/divested business | 0 |  |
Impairment losses | 0 |  |
Translation differences | 0 |  |
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 | 84,570 |  |
Intangible assets and goodwill, Closing balance | 52,944 | 84,570 |
Goodwill [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 90,914 | 44,963 |
Additions | 0 |  |
Balances regarding acquired/divested business | 348 | 40,881 |
Disposals | 0 |  |
Translation differences | (77) | 5,070 |
Intangible assets and goodwill, Closing balance | 91,185 | 90,914 | 44,963
Goodwill [member] | Accumulated depreciation and amortization [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 0 |  |
Amortizations | 0 |  |
Balances regarding acquired/divested business | 0 |  |
Disposals | 0 |  |
Translation differences | 0 |  |
Intangible assets and goodwill, Closing balance | 0 | 0 |
Goodwill [member] | Accumulated impairment losses [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | (6,344) | (6,759) |
Balances regarding acquired/divested business | 0 | 415 |
Impairment losses | (31,897) | 0 |
Translation differences | 0 |  |
Intangible assets and goodwill, Closing balance | (38,241) | (6,344) | (6,759)
Customer Relationships IPR and other Intangible Assets [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 26,340 |  |
Intangible assets and goodwill, Closing balance | 22,667 | 26,340 |
Customer Relationships IPR 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 | 82,854 | 55,936 |
Additions | 97 | 126 |
Balances regarding acquired/divested business | 306 | 23,451 |
Disposals | (563) | (452) |
Translation differences | (1,884) | 3,793 |
Intangible assets and goodwill, Closing balance | 80,810 | 82,854 | 55,936
Customer Relationships IPR 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 | (48,770) | (44,456) |
Amortizations | (3,321) | (1,991) |
Balances regarding acquired/divested business | 0 | 22 |
Disposals | 563 | 452 |
Translation differences | 1,123 | (2,797) |
Intangible assets and goodwill, Closing balance | (50,405) | (48,770) | (44,456)
Customer Relationships IPR 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 | (7,744) | (7,650) |
Balances regarding acquired/divested business | 0 | 81 |
Impairment losses | (19) | (61) |
Translation differences | 25 | (114) |
Intangible assets and goodwill, Closing balance | kr (7,738) | kr (7,744) | kr (7,650)

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