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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)