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H4 Related party transactions (Tables)
12 Months Ended
Dec. 31, 2024
Related party transactions [abstract]  
Summary of Related Party Transactions
SEK billion
  
  2024
    
  2023
    
  2022
 
Sales to Ericsson Nikola Tesla
     0.4        0.4        0.3  
Purchases from Ericsson Nikola Tesla
     1.6        1.6        1.5