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Taxes - Deferred Tax Credits (Detail) - SEK (kr)
kr in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of Deferred Tax Credits [Line Items]    
Recognized deferred tax credits tax value kr 5,453 kr 2,081
Unrecognized deferred tax credits tax value 1,148 kr 1,296
2024 [member]    
Disclosure of Deferred Tax Credits [Line Items]    
Recognized deferred tax credits tax value 99  
Unrecognized deferred tax credits tax value 135  
2025 [member]    
Disclosure of Deferred Tax Credits [Line Items]    
Recognized deferred tax credits tax value 938  
Unrecognized deferred tax credits tax value 108  
2026 [member]    
Disclosure of Deferred Tax Credits [Line Items]    
Recognized deferred tax credits tax value 46  
Unrecognized deferred tax credits tax value 125  
2027 [member]    
Disclosure of Deferred Tax Credits [Line Items]    
Recognized deferred tax credits tax value 1,778  
Unrecognized deferred tax credits tax value 133  
2028 [member]    
Disclosure of Deferred Tax Credits [Line Items]    
Recognized deferred tax credits tax value 1,521  
Unrecognized deferred tax credits tax value 8  
2029 or later [member]    
Disclosure of Deferred Tax Credits [Line Items]    
Recognized deferred tax credits tax value 1,071  
Unrecognized deferred tax credits tax value kr 639