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Financial Income and Expenses - Summary of Financial Income and Expenses (Parenthetical) (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Detailed Information About Finance Income Expense [Abstract]      
Net loss from revaluation of customer finance receivables kr 209 kr 15  
Net gain from revaluation of customer finance receivables     kr 350
Net loss on revaluation of investments in shares and participations kr 186 kr 205  
Net gain on revaluation of investments in shares and participations     kr 784