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Taxes - Deferred Tax Credits (Detail) - SEK (kr)
kr in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of Deferred Tax Credits [Line Items]    
Recognized deferred tax credits tax value kr 5,027 kr 5,453
Unrecognized deferred tax credits tax value 1,114 kr 1,148
2025 [member]    
Disclosure of Deferred Tax Credits [Line Items]    
Recognized deferred tax credits tax value 32  
Unrecognized deferred tax credits tax value 108  
2026 [member]    
Disclosure of Deferred Tax Credits [Line Items]    
Recognized deferred tax credits tax value 121  
Unrecognized deferred tax credits tax value 122  
2027 [member]    
Disclosure of Deferred Tax Credits [Line Items]    
Recognized deferred tax credits tax value 33  
Unrecognized deferred tax credits tax value 105  
2028 [member]    
Disclosure of Deferred Tax Credits [Line Items]    
Recognized deferred tax credits tax value 1,376  
Unrecognized deferred tax credits tax value 9  
2029 [member]    
Disclosure of Deferred Tax Credits [Line Items]    
Recognized deferred tax credits tax value 2,132  
Unrecognized deferred tax credits tax value 10  
2030 or later [member]    
Disclosure of Deferred Tax Credits [Line Items]    
Recognized deferred tax credits tax value kr 1,333