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Customer Contract Related Balances - Additional Information (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Receivables Customer Finance Contract Assets And Contract Liabilities [Line Items]    
Amortization Of Deferred Sales Commissions kr 571 kr (457)
2025 [member]    
Disclosure Of Receivables Customer Finance Contract Assets And Contract Liabilities [Line Items]    
Percentage of expected transaction price allocated to remaining performance obligation will converted to revenue 67.00%  
2026 [member]    
Disclosure Of Receivables Customer Finance Contract Assets And Contract Liabilities [Line Items]    
Percentage of expected transaction price allocated to remaining performance obligation will converted to revenue 17.00%  
2027 and beyond [member]    
Disclosure Of Receivables Customer Finance Contract Assets And Contract Liabilities [Line Items]    
Percentage of expected transaction price allocated to remaining performance obligation will converted to revenue 16.00%