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Other Operating Income and Expenses - Schedule of Other Operating Income and Expenses (Parenthetical) (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other Operating Income and Expenses [Line Items]      
Impairment losses kr (99.0) kr (154.0)  
Gain on resolution of a commercial dispute 1,900.0    
Provisions 11,715.0 11,706.0 kr 11,588.0
Vonage Holdings Corp [member]      
Other Operating Income and Expenses [Line Items]      
Impairment losses (1.3) kr (31.9)  
Others [member]      
Other Operating Income and Expenses [Line Items]      
Provisions (2,300.0)   (2,300.0)
IoT and other portfolio adjustments [member]      
Other Operating Income and Expenses [Line Items]      
Charges related to divestment of business kr (1,000.0)   kr (1,000.0)