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Intangible Assets - Summary of Intangible Assets (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Impairment losses kr (15,333) kr (31,916) kr (61)
Capitalized development expenditure [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill, Opening balance 4,678    
Intangible assets and goodwill, Closing balance 4,593 4,678  
Capitalized development expenditure [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill, Opening balance 22,983 21,096  
Additions 1,300 2,173  
Disposals   (153)  
Reclassifications 20 (16)  
Translation differences 268 (117)  
Intangible assets and goodwill, Closing balance 24,571 22,983 21,096
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 (14,560) (13,646)  
Amortizations (1,480) (1,137)  
Disposals   153  
Translation differences (193) 70  
Intangible assets and goodwill, Closing balance (16,233) (14,560) (13,646)
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 52,944    
Intangible assets and goodwill, Closing balance 56,077 52,944  
Goodwill [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill, Opening balance 91,185 90,914  
Balances regarding acquired/divested business (375) 348  
Translation differences 4,392 (77)  
Intangible assets and goodwill, Closing balance 95,202 91,185 90,914
Goodwill [member] | Accumulated impairment losses [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill, Opening balance (38,241) (6,344)  
Balances regarding acquired/divested business 375    
Impairment losses (1,260) (31,897)  
Translation differences 1    
Intangible assets and goodwill, Closing balance (39,125) (38,241) (6,344)
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 22,667    
Intangible assets and goodwill, Closing balance 7,954 22,667  
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 80,810 82,854  
Additions 376 97  
Balances regarding acquired/divested business (249) 306  
Disposals (314) (563)  
Translation differences 4,437 (1,884)  
Intangible assets and goodwill, Closing balance 85,060 80,810 82,854
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 (50,405) (48,770)  
Amortizations (2,500) (3,321)  
Balances regarding acquired/divested business 184    
Disposals 314 563  
Translation differences (2,281) 1,123  
Intangible assets and goodwill, Closing balance (54,688) (50,405) (48,770)
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 (7,738) (7,744)  
Balances regarding acquired/divested business 65    
Impairment losses (14,073) (19)  
Translation differences (672) 25  
Intangible assets and goodwill, Closing balance kr (22,418) kr (7,738) kr (7,744)