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Other Operating Income and Expenses - Schedule of Other Operating Income and Expenses (Parenthetical) (Detail) - SEK (kr)
kr in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other Operating Income and Expenses [Line Items]        
Impairment charges of goodwill   kr (31,897) kr 0 kr (112)
Provisions   11,706 11,588 kr 9,504
Vonage Holdings Corp [member]        
Other Operating Income and Expenses [Line Items]        
Impairment charges of goodwill kr (31,900) kr (31,900)    
Others [member]        
Other Operating Income and Expenses [Line Items]        
Provisions     (2,300)  
IoT and other portfolio adjustments [member]        
Other Operating Income and Expenses [Line Items]        
Charges related to divestment of business     kr (1,000)